BIO EFFICACY OF SOME EXTRACTS AGAINST SUGARCANE STALK BORER CHILD AURICILIUS DUDGEON (: CRAMBIDAE)

^ •••-.X V X ABSTRACT '\ THESIS ^^ SUBMITTED FOR THE AWARD OF THE DEGREE OF

ZOOLOGY '^p-' (ENTOMOLOGY) .^

BY RASHID MUMTAZ

DEPARTMENT OF ZDaLOCSY AL.IC3ARH MUSLIM UIMIVERSITY ALJGARH ((NiOfA) 2005

ABSTRACT

Bio efficacy of some plant extracts against sugarcane stalk borer Chilo auricilius Dudgeon (Lepidoptera: Crambidae)

Sugarcane is liable to attack by pests right from planting till harvest. The pests cause enormous losses both in tonnage and recovery of

in the mill. It is estimated about 8 to 10 percent of total sugarcane crop in the country is damaged by every year and this works out to a loss of 80 to

100 corers of rupees. The occurrence of drought and flood influenced the heavy buildup certain pests over large areas in epidemic from. (Siddiqui, 1960;

Verma et, al. 1991). In general, the insect pest problems of sugarcane are more

sever in subtropical belt than the fropicalbelt .

Widespread use of synthetic pesticides has led to the development of pesticidal resistance in a large number of insect pests (Saxena and Khan,

1986). There has been an urgent need for selective and effective pest control methods which can be easily included in the modem pest management concept

(Back, 1972) new bioactive products will be needed which are pest specific.

Ecofriendly to man and other beneficial organisms biodegradable, less prone to development of pest resistance and economical viable. Insecticides of plant origin provided a substantial answer to many of the problems particularly the environmental pollution and ecofriendly in nature. Considerable attention in now being given to incorporate the use of naturally occurring insecticides to man's armoury to combat noxious insect pest spp. (Jacobson, 1971).

Sugarcane stalk borer, Chilo auricilius Dudgeon is the pest of sugarcane belongs to the family Crambidae of Lepidoptera. In India it was first time recorded from Bengal in 1905 (Dudgeon: 1905; Lefroy, 1906). Fletcher and

Gosh (1919) reported it as a pest of sugarcane at Pusa, Bihar and caused heavy loss to sugar industry in India about 3.32 million tones (Chaudhary, 1981).

Plants are the richest source of organic chemical on the earth. It is estimated that the total number of plant chemicals may be 40, 00, 000 or more but only about 10, 000 secondary plant metabolites have been chemically defined. have many substances, which have feeding and oviposition inhibitory effects on the insects. The applied entomologists engaged in the search of safer and long lasting insect control measure's can utilize such plants or their extracts for protecting crop from insect attack.

Indiscriminate and injudicious uses of synthetic insecticides in the past five decades have posed serious problems to our pest management programme in the field as well as in the storage. These problems lead to initiate a search for the non-hazardous chemicals in which the naturally available plant resources are the foremost. The present investigations were planned keeping in view of all the above factors with the aim to find out some suitable plant derivatives having good ovipositional deterrent, repellent activity, ovicidal and insecticidal activity against Chilo auricilius Dudgeon. Which can be exploited to decrease our dependence on synthetic pesticides. The selectivity of these bioactive products makes them valuable in IPM ofChilo auricilius.

The following non-edible seed oils and plants were used for their biological efficiency.

A. Eucalyptus globulus, Callistemon citrinus DC, Bongainvillea spectibili

(wild) Azadirachta indica, Murya koenigii. Cannabis sativa, Callotropis

procera (Wild), Thuja compacta, Lantana camara (Linn), Nerium indicum,

Rauvalfia serpentine Benths, Hibiscus rosasinensis, Diplazium esculantum

(Retz), Cymbopoganflexousus (Stapf) and Mantha piperata.

B. Azadirachta indica, Pongamia pinnata, Ricinus communis and Madhuca

longifolia.

The sequential extraction of plant parts were carried out in Sachet extractor using different solvent in sugarcane as follows: Petroleum ether.

Chloroform, Methanol and Distilled water, while oils were extracted with crushers after decortication.

Listed plant extracts used in the experiment showed absolute ovipositional deterrent effective. Methanol extract of E. globulus leaves.

Petroleum ether extract of B. spectibili flowers. Petroleum ether extract of C. procera leaves. Petroleum ether and Chloroform extracts of N. indicum leaves extract.

The salient findings were as follows:

Among the non-edible oils, A. indica oil and P. pinnata oil proved as ovipositional deterrent. The maximum number of eggs were found on R. communis and M. longifolia oils.

The following plant parts extracts gave the highest reduction in viability of eggs, deposited on respective treated strips/sectors i.e. E. globulus, C. procera leaves, N. indicum (leaves), D. esculantum leaves, T. compacta and B. spectibili.

All treated oils {A. indica, P. pinnata, R. communis and M. longifolia) gave the significant reduction in the viability of eggs, which were deposited on the respective treated strips/sectors.

The hatching period of eggs in the following treatments (plant extracts treated strips/sectors/non-edible seed oils) increased the days from the normal hatching period of eggs of C. auricilius. It was recorded in feeding method that

A. indica was most polent followed P. pinnata oil in reducing the survival of larvae. The various plant parts extract gave significant reduction in survival of larvae. B. spectibili (leaves & flowers), C. procera (leaves), C. citrinus (leaves) and N. indicum leaves.

In general, it was found that three days old eggs were found to be the most susceptible when compared to two and one day old eggs of C auricilius.

In plant extracts B. spectibili, A. indica, N. indicum, C. citrinus, T. compacta,

E. globulus, gave the highest reduction in survival of three days old eggs of C. auricilius, while, A. indica oil and P. pinnata gave the highest mortality of three days old eggs.

LC30 and LC50 were found to be the best at all levels of B. spectibili

(flowers), while LC90 was the most effective at all levels of ^4. indica leaves (3 to 4 days old larvae). In order to relative toxicity P. pinnata followed by A. indica oil, was found to be the lowest at all the LC levels when compared to the standard insecticide, Endosulfan, H. rosasinensis (leaves) extract gave maximum residual toxicity 7 days while A. indica oil showed the maximum residual toxicity 8 days amongst tested non-edible oils. BIO EFFICACY OF SOME PLANT EXTRACTS AGAINST SUGARCANE STALK BORER CHILO A URICILIUS DUDGEON (LEPIDOPTERA: CRAMBIDAE)

THESIS

SUBMITTED FOR THE AWARD OF THE DEGREE OF

w

/r ^\ }J ZOOLOGY ^ (ENTOMOLOGY)

K • .^*'' s..-.

BY RASHID MUMTAZ

DEPARTMENT DF ZOaLOGY AL-IGARH MUSLIM UtMIVERSITY ALIGARH (INDIA) 2005 T6745 BIO EFFICACY OF SOME PLANT EXTRACTS AGAINST SUGARCANE STALK BORER CHILO A URICILIUS DUDGEON (LEPIDOPTERA: CRAMBIDAE)

1 * m I

% DOCTOR OF PHILOSOPHY

IN

Zoology (ENTOMOLOGY)

s^* <^

Rashid Mumtaz

^ ^^-^^-^-^-^-^^^^-^-^-^-^^^^ r f f r f f A ? r -V I* eaicate f t f f f eiooe f r

'ff'fr'fr'fr-fr-ff'fr'fr'fr'fr'fr-fr'fr'ff-ff-ff'fr'^ Department Of Zoology Aligarh Muslim University Aligarli-202002

Certificate

This to certify that Mr. Rashid Mumtaz has completed his Ph.D. work under my supervision on the problem entitled "BIO EFFICACY OF SOME PLANT EXTRACTS AGAINST SUGARCANE STALK BORER CHILO AURICILIUS DUDGEON (LEPIDOPTERA: CRAMBIDAE), for the degree of Doctor of Philosophy, Aligarh Muslim University, Aligarh. This amount to an original contribution and a distinct addition to the existing knowledge of the subject. It contains some important new observation as well. He is allowed to submit the work of Ph.D. degree of the Ahgarh Muslim University.

t* ^'^

Date: Prof. Absar M. Khan ACKNOWLEDGMENT

"TO THE SOVEREIGN GOD I GIVE ALL GLORY"

/ am e?(tremely priviCt^ed to eycpress my dup sense of reverence andindtStedness

to my supervisor iPTOfcSSOT S^.iAi» 9QUin 'Department of Zoology S^Ggarh 9dusGm

llniversity S^BgaHi ItP India, for fiis sincere ej^iortation, mtticuCous guidance and

susUdntd interest, constant encouragement and constructive criticism, and painstaking

efforts throughout tfU course oftfie investigation and preparation of the thesis.

I ejcpress my dupest gratitude and veneration to (BTOJCSSOT M.. inCttjdt,

Chairman (Deptt. of Zoology, ^DdRl ^iGgarh, providing necessary fad&ties for

conducting the research.

I am immensely indeStedto 9dy Co-advisor *Dr* S*%i Sift£rl^isstt. Professor

(Deptt, af'EntomoCogy, CSJh tKflnpur, for his efficient and inspiring guidance in the

Uivestyaiion period

HHth a sense of gratitude and great pleasure, I aclqunvle(^e the wholehearted

cooperation eyctended6y, *DT, SccnUl 'WohoB (Jldvisor) (Deptt. cf (Biotechnology

govt, cf India 9^zu (DdhL

I find myself entir^ devoid of zoords when it comes to gracious sacrifice of my

iPOTtntS tuho Brought me to this position and were even xiAth me when I was not at

my best. I find myself envdoped in warmth cf love of my Brothers 9(fiaGxC

Mumtaz 9(fum (9{fuCeem), Sajid Mumtaz 9(fum, ^fiaSees

Tasneem fatma, Sariya y^atima and sisters TaSassum, Sititja and ^adma (Shadab), f% nt-pUrvs 9A.aaz, Shaza, 9{asltra and

MdZCCnfor their immacuCatc affection and never ending motivation, lufdch l^eeps me

ignited, striving for fiigher goals.

y^riends mean your ouni worCd. TJie space v/iH Be too Cess to mention each and

everyone, 'yet, I ivouid (ikg- to mention names iii^ ^aris 'Blud, S^sCam Jifian, SaquiB,

l^udid, 'Kfiursfieed, 9{aseeruddin, 9dinto, 'Kpifi, Qaisar, (Dr.JameeC, Or,'Wahid,

'Dr.'Rfisfiid, 1>r.9(gsir, Tramod v/ithout xufiom my stay on the earth tvouCd have been impossiSCe.

Ihanl^ are also due to non-teaching staff of the department, 'Babu 'Bhai, iHaseen, fareed, Shiv (Parsad, for their assistanu and cooperation from time to time throughout the period of this investigation.

1hanl(s are due to cUC of my Cab mates, Tanu, Shashi, H^jiqaiya, 'Dr.SuneeC,

Th-.^deena, ^.Vasudh, (DrJlnlqta, ^vi, J^iddetp and Tooja for getting cdt sorts of help from them during my research zuorf^.

I thanfii to ^r. O^tin Sa3(ena and 9diss. (Priyan^ Sa^cenafor the typing of the manuscript neatly and correctly.

Lastly, I thankjht Qod, almighty for his BCessings during the all years of my Ufe and studies. I do than^every other person who directly or indirectly aided the cause of preparing my thesis, degree.

Aligarh Muslim University (Rashid Mumtaz) SkUga^ Author Contents

1. INTRODUCTION

2. REWIEW OF LITERATURE

i). DISTRIBUTION ii). BIOLOGY iii). EXTENT OF DAMAGE iv). MANAGEMENT V). PLANT EXTRACT AS A BIOPESTICIDES vi). NON-EDIBLE SEED OIL AS A BIOPESTICIDES vii). TOXIC EFFECTS OF A.INDICA (NEEM) PRODUCTS (a) A.INDICA EXTRACT/PRODUCTS (b) LEAF (c) SEED (d) OIL

viii). A.INDICA AS A BIO-PESTICIDES

(a) ANTIFEEDENT ACTIVITY (b) REPELLENT ACTIVITY (c) DETERRENT ACTIVITY (d) IGR

3. MATERIAL AND METHODS

i. CHILO AURICILIUS (DUDGEON) METHOD OF REARING AND THEIR MAINTENANCE OF CULTURE. ii. EXTRACTION OF NON-EDIBLE SEED OILS, iii. PLANT MATERIAL USED IN EXPERIMENT, iv. SEQUENTL^L EXTRACTION OF PLANT MATERIAL. V. PREPARATION OF TEST SOLUTION. vi. EXPERIMENTAL EVALUATION FOR DIFFERENT PLANT EXTRACTS AND NON-EDIBLE SEED OILS. vii. OVICIDAL ACTION OF DIFFERENT PLANT EXTRACTS AND NON-EDIBLE SEED OILS AGAINST THE EGGS OF C. AURICILIUS. viii. INSECTICIDAL ACTIVITY OF DIFFERENT PLANT EXTRACTS AND NON-EDIBLE SEED OILS AGAINST THE LARVAE OF CHILO AURiaUUS. ix. RESIDUAL TOXICITY OF DIFFERENT EFFECTIVE PLANT EXTRACT AND NON-EDIBLE SEED OILS. X. STATISTICAL PROCEDURE,

(a) PROBIT ANALYSIS (b) PERSISTANCE TOXICITY VALUES (PT VALUES)

4. RESULT AND DISCUSSION

4.1 A- STUDIES ON THE EFFECTS OF PLANT EXTRACTS AGAINST CHILO A URICILIUS.

1. EFFECTS OF E. GLOBULUS LEAVES EXTRACTS

i) EFFECT ON OVIPOSITION ii) EFFECT ON LARVAL SURVIVAL iii) OVICIDAL ACTION

2. EFFECTS OF C. CITRINUS LEAVES AND EXTRACTS.

i) EFFECT ON OVIPOSITION ii) EFFECT ON LARVAL SURVIVAL iii) OVICIDAL ACTION

3. EFFECTS OF B. SPECTIBILI LEAVES AND FLOWERS EXTRACTS.

i) EFFECT ON OVIPOSITION ii) EFFECT ON LARVAL SURVIVAL iii) OVICIDAL ACTION

4. EFFECTS ON A. INDICA LEAVES EXTRACTS.

i) EFFECT ON OVIPOSITION ii) EFFECT ON LARVAL SURVIVAL iii) OVICIDAL ACTION

5. EFFECTS OF M. KOENIGII LEAVES EXTRACTS,

i) EFFECT ON OVIPOSITION ii) EFFECT ON LARVAL SURVIVAL iii) OVICIDAL ACTION

6. EFFECTS OF C SA TIVA LEAVES EXTRACTS.

i) EFFECT ON OVIPOSITION ii) EFFECT ON LARVAL SURVIVAL iii) OVICIDAL ACTION

7. EFFECTS OF C PROCERA LEAVES EXTRACTS.

i) EFFECT ON OVIPOSITION ii) EFFECT ON LARVAL SURVIVAL iii) OVICIDAL ACTION

8. EFFECTS OF T. COMPACTA LEAVES EXTRACTS.

i) EFFECT ON OVIPOSITION ii) EFFECT ON LARVAL SURVIVAL iii) OVICIDAL ACTION

9. EFFECTS OF L. CAMARA LEAVES EXTRACTS.

i) EFFECT ON OVIPOSITION ii) EFFECT ON LARVAL SURVIVAL iii) OVICIDAL ACTION

10. EFFECTS OF A^. INDICUM LEAVES EXTRACTS.

i) EFFECT ON OVIPOSITION ii) EFFECT ON LARVAL SURVIVAL iii) OVICIDAL ACTION

11. EFFECTS OF R. SERPENTINA ROOTS.

i) EFFECT ON OVIPOSITION ii) EFFECT ON LARVAL SURVIVAL iii) OVICIDAL ACTION

12. EFFECTS OF H. ROSASINENSIS LEAVES EXTRACTS.

i) EFFECT ON OVIPOSITION ii) EFFECT ON LARVAL SURVIVAL iii) OVICIDAL ACTION 13. EFFECTS OF D. ESCULANTUM LEAVES EXTRACTS.

i) EFFECT ON OVIPOSITION ii) EFFECT ON LARVAL SURVIVAL iii) OVICIDAL ACTION

14. EFFECTS OF C. FLEXUOSUS LEAVES EXTRACTS.

i) EFFECT ON OVIPOSITION ii) EFFECT ON LARVAL SURVIVAL iii) OVICIDAL ACTION

15. EFFECTS OF M. PIPERATA LEAVES EXTRACTS.

i) EFFECT ON OVIPOSITION ii) EFFECT ON LARVAL SURVIVAL iii) OVICIDAL ACTION

4.2 B- STUDIES ON THE EFFECTS OF NON-EDIBLE SEED OILS AGAINST C. AURICILIUS. 1. i) EFFECT ON OVIPOSITION ii) EFFECT ON LARVAL SURVIVAL iii) OVICIDAL ACTION

2. i) RELATIVE TOXICITY OF EFFECTIVE PLANT EXTRACTS AND ii) NON-EDIBLE SEED OILS AGAINST C. AURICILIUS LARVAE.

3. LETHAL CONCENTRATION AND TOXICITY OF PLANT EXTRACTS/NON-EDIBLE SEED OILS AGAINST EGGS OF C. AURICILIUS.

4. TO DETERMINING THE RESIDUAL TOXICITY OF EFFECTIVE PLANT EXTRACTS/NON-EDIBLE SEED OILS BY FOLIAR APPLICATION METHOD AGAINST C. AURICILIUS.

I. (a) PT VALUES OF E. GLOBULUS AND C. STIVA LEAVES EXTRACT. (b) PERCENT REDUCTION IN MORTALITY. II. (a) PT VALUES OF B. SPECTIBILI LEAVES AND FLOWERS EXTRACT. (b) PERCENT REDUCTION IN MORTALITY.

III. (a) PT VALUES OF A. INDICA LEAVES EXTRACT. (b) PERCENT REDUCTION IN MORTALITY. IV. (a) PT VALUES OF C PROCERA LEAVES EXTRACT. (b) PERCENT REDUCTION IN MORTALITY. V. (a) PT VALUES OF A^. INDICUM LEAVES EXTRACT. (b) PERCENT REDUCTION IN MORTALITY.

VI. (a) PT VALUES OF D. ESCULANTUM AND H. ROSASINENSIS LEAVES EXTRACT. (b) PERCENT REDUCTION IN MORTALITY.

VII. (a) PT VALUES OF C FLEXUOSUS LEAVES EXTRACT. (b) PERCENT REDUCTION IN MORTALITY.

VIII. (a) PT VALUES OF EFFECTIVE NON-EDIBLE SEED OILS. (b) PERCENT REDUCTION IN MORTALITY.

5. SUMMARY AND CONCLUSION

6. REFFERENCES f INTRODUCTION

Sugarcane, Saccharum officinarum L. is the most important cash crop of

the world fulfilling 60 percent of the sucrose requirement. The total production of

sugarcane in the world was standing at 1,318, 178, 070 MT in the year 2004 in an area of 20, 114, 934 Ha.

Brazil is the largest producer of Sugarcane in the world with 411, 009, 984

MT, in the, 5, 455, 130 Ha area, which as followed by 244, ^00, 000 MT in 4, 100,

000 Ha area and 1, 316, 000 MT in 244, 800, 000 Ha (FAQ 2004) in India &

China, respectively.

In addition, sugarcane supports a large number of open Pan Sugar

(Khandsari) and Jaggery (gur), and during the last 50 years production of sugarcane and sugar in India has made tremendous strides. Productivity of sugarcane in India ranges between 50 tones per hectare in Bihar to 105 tones per hectare in Tamilnadu, which has few parallels in the world. The average productivity of sugarcane in the country around 72 tones per hectare and for obtaining 415 millions tones of sugarcane from the cultivated area of about 4.2 million hectare, the productivity of sugarcane has got to be raised to the level of

100 tones per hectare by 2020 AD.

Sugarcane in India is grown in two distinct regions, viz., the northern subtropical and the peninsular tropical belt. The crop is continuously grown on large areas around sugar factories. Normally, a plant crop is followed by one or two ratoon crops. This provides a sort of mono cropping stable agro-ecosystem for

multiplication of insect pests. Though sugarcane agro-ecosystem is stable one but

periodically it is affected by different abiotic and biotic changes of the

environment. These changes individually or jointly influence the insect pests

complex over a period of time. Growing sugarcane for higher production of sugar

per unit area and time accentuated the existing pest problems and also changed the

status of many insects. Indiscriminate transport of sugarcane seed material and

prolonged crushing period have also played an important role in changing insect

pests situation in certain pockets.

Sugarcane is liable to attack by insect pests right from planting till harvest.

The pests cause enormous losses both in tonnage and recovery of sugar in the mill.

It is estimated about 8 to 10 percent of total sugarcane crop in the country is

damaged by insects every year and this works out to a loss of 80 to 100 corers of

rupees.

The occurrence of drought and flood influenced the heavy buildup certain

pests over large areas in epidemic from. (Siddiqui, 1960; Verma eU aL 1991). In

general, the insect pest problems of sugarcane are more sever in subtropical belt

than the tropical belt.

Out of 200 insect pests found infesting sugarcane crop (David &

Nandgopal, 1986), only two dozens are recognized as major ones. These include borers, termites, black bug, scale insects, mealy bug, pyrilla, white flies and the most recent one sugarcane wooly aphid etc. The losses inflicted by pests are influenced by sugarcane genotype, pest severity and/or the pest brood involved (as

in case of top borer), nature of crop-plant/ratoon, time of planting and climate and

edaphic factors.

In the recent era of agriculture intensification of the pest control strategies

relies only on the synthetic organic chemical pesticides, which have only led to an

energy driven escalation in the pest control technologies besides forcing the

agriculture in to the vicious circle of the pesticides treadmill and the sustainability

of agriculture at stake as well. It is now realized that the usage of chemical pesticides is only doing more harm to agro ecosystem and ultimately the biosphere with this problem is continuously affected along with other related environmental consequences due to continuous, extensive and injudicious use of pesticides. It has become imperative to searchout other alternative measures for the management of insect pest problems of sugarcane. The changing perception in the pest management thus demands newer environmentally sound pest control technologies. In the past couple of decades insect pest control has under gone spectacular changes with regards to concepts and methods largely due to advances in understanding of insect biology and innovations in pest management technology, number of other problems well known to us, which included ecological and sociological insecurity. This has created a new awareness and increased emphasis on bio-intensive integrated pest management (BIPM) for insect pest.

The battle between man and insect pest is being waged from times immemorial, with man clianging his strategies of effective counter strateg}' by insects producing new resistant strains. The use of chemical for insect control started with the use of plant materials, which touched its height of sophistication and modernization with the introduction of broad-spectrum synthetic insecticides.

Man often unknowingly interferes with the environment in such a way that becomes the slave of his own creation. The conventional method of pest control i.e. the use of pesticides is hazardous for human population due to their inimical effect on the non-target spp. and environmental population etc. The effects of these pesticides soon started appearing and have come under controversy during the recent years because of poisoning of livestock, wild life and killing of beneficial organisms have been linked with the use of theses pesticides.

Widespread use of synthetic pesticides has led to the development of pesticidal resistance in a large number of insect pests (Saxena and Khan, 1986). There has been an urgent need for selective and effective pest control methods which can be easily included in the modem pest management concept (Back, 1972) new bioactive products will be needed which are pest specific. Ecofriendly to man and other beneficial organisms biodegradable, less prone to development of pest resistance and economical viable. Insecticides of plant origin provided a substantial answer to many of the problems particularly the environmental pollution and ecofriendly in nature. Considerable attention in now being given to incorporate the use of naturally occurring insecticides to man's armoury to combat noxious insect pest spp. (Jacobson, 1971). Sugarcane stalk borer, Chilo auricilius Dudgeon is the pest of sugarcane belongs to Order: Lepidoptera Family:

Crambidae. In India it was first time recorded from Bengal in 1905 (Dudgeon:

1905; Lefroy, 1906). Fletcher and Gosh (1919) reported it as a pest of sugarcane

at Pusa, Bihar and caused heavy loss to sugar industry in India about 3.32 million

tones (Chaudhary, 1981).

Plants are the richest source of organic chemical on the earth. It is estimated

that the total number of plant chemicals may be 40, 00, 000 or more but only about

10, 000 secondary plant metabolites have been chemically defined. Plants have

many substances, which have feeding and oviposition inhibitory effects on the

insects. The applied entomologists engaged in the search of safer and long lasting

insect control measure's can utilize such plants or their extracts for protecting crop

from insect attack.

The repository of biodiversity of total floura wealth in India is estimated to

be 45, 000 spp. which is about 12 percent of global wealth, out of which 33

percent are endemic. The 15, 000 flowering plants spp. belonging to 315 different

families and 2, 250 genera are endemic (47 families and 140 genera) (Pandey et

al., 1998). The pesticidal plants reported so far are distributed in 189 plant families

and there are more than 2400 plants spp. as pesticidal (Singh, 2000). Another estimate revealed that 2121 plants spp. posses pest control properties out of which

1005 spp. have insecticidal 384 antifeedents, 297 repellents, 27 attractants and 31 growth inhibitory properties (Raheja, 1998). It may be difficult to say with present level of knowledge these botanical will replace with synthetic organic insecticides in near future. Nevertheless, it could be possible that plant origin insecticides may find an appropriate place in insect pest management.

The present investigators have therefore been aimed towards the discovery of bioactive products present in fifteen locally available plants, which can be used in management of the population of sugarcane stalk borer Chilo auricilius. Extracts from the various parts of these plants and four non-edible seed oils were tested during the present studies with the following aspects.

1. To determine the effects of the oviposition behaviour oi chilo auricilius.

2. To determine the insecticidai effects on larvae of the target insect Chilo

auricilius

3. To determine the ovicidal effect on old eggs of Chilo auricilius.

4. To assess the relative toxicity of active products and non-edible seed oils.

5. To assess the residual toxicity of active plant products and non-edible seed

oils. ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^

eoieiv

£i 'ieraiiure

'fr-fr'fffr'ff'fr'fr-ff'ff'fr'fr'fr'fr'fr'fr'ff'fr^^ Review of Literature

1. Distribution

2. Biology

3. Extent of Damage

4. Management

5. Plant extracts as biopesticide

6. Non-edible seed oils as biopesticides

7. Toxic effects of A. indica (Neem) products

on insects

a) A. indica (Neem extract) / product

b) Leaf

c) Seed

d) Oil

8. A. indica (Neem) as biopesticides

a) Antifeedant Activity b) Repellent Activity c) Deterrent Activity d) I G R Activity REVIEW OF LITERATURE

Distribution

The available evidences on the distribution of Chilo auricilins in India

indicated that it was first recorded from Bengal in 1905 (Dudgeon, 1905; Lefroy,

1906). Fletcher and Gosh (1919) reported it as a pest of sugarcane at Pusa, Bihar.

In some parts of Uttar Pradesh, it occurred in an epidemic from in 1940 (Gupta,

1940). Within a few years, it spread all over Uttar Pradesh, Haryana and Punjab.

Since then it is a major pest in these states as well as in Bihar (Gupta and Singh,

1951; Gupta, 1960; Mahindra, 1981). Agrawal and Bhatia (1965) reported it

occurrence from Himanchal Pradesh. It has also been reported from Nagaland

(Avasthy, 1981). Biology of Chilo auricilius Dudgeon

Madan and Agrawal (1982) studied the biology of the pupal and adult stages of the pyralid Chilo auricilius Dudgn. on sugar cane. The duration of the pupal period of males ranged from 5.1 to 6.7 days from June to October and 13.3-

18.5 days in January-February. The average length of male and female pupae was

10.2-12.1 mm and 12.7-14.5 mm, respectively, and the average weight 32.9-55.2 mg and 59.9-87.0 mg. The adult male life span averaged 2.1-4.9 days, while that of females averaged 2.8-5.0 days. The sex ratio was almost 1:1.

Sardana (1996) reported the five instar of the Chilo auricilius were determined from the number of cast exuviate and the frequency distribution of head capsule widths of fields and laboratory reared larvae during August -

8 September. Six instars were observed during summer and winter using the frequency distribution of head capsule widths. Dyer rule and linear regressions adequately described larval growth. Direct observation of cast exuviate by the

Larvae seemed to be the most reliable method estimating the number of instars.

Jena and Patnaik (1997) reported on the seasonal activity of stalk borer,

Chilo auricilius in Nayagarh, Orrisa during 1992-94, revealed that the pest remained active from fourth week of June to November when the maximum temperature remained between 32.5^C and 36.1*^C and relative humidity between

71.3 and 79.5 percent. It was concluded from the studies that higher temperature, high relative humidity and rainfall favoured plan based on the negative binomial pattern. A sequential sampling plan based on the negative binomial distribution, economic injury level and a risk factor of alpha and beta set at 0.1 was developed.

Sardana (1998) conducted a field study in 1991-95 in Haryana on sugarcane and studied the ovipositional behaviour of Chilo auricilius in plant and ratoon crops. About 50% of the eggs were laid on dry leaves and trash lying on the ground, and the remaining were laid on green leaves (number 2-6).

Extent of damage

The pest is very well known to cause heavy loss to the sugar industry particularly in Bihar, Uttar Pradesh, Haryana and Punjab (Chaudhary, 1981). A number of workers had reported the loss caused by stalk borer in cane yield and sugar recovery. Gupta and Singh (1951) reported at the 29 percent infestation of intemodes, the reduction in cane yield was 17-33 percent and the loss in sugar recovery range from 1.7-3.7 units and Jarwal Road in Uttar Pradesh.

Bhardwaj et al. (1981) studied the encidence of stalk borer in relation to different season crop plant, ratoon crop and its relation with the environmental factors at Regional Research Station, Uchani, Kamal. They observed that the evidence of Chilo auriciliiis was more in autumn planted crop (95.2 to 96.7 percent) than that of spring planted crop (87.0 to 96.5 percent). Ratoon crop had the minimum incidence (54.6 to 94.4 percent). The intensity of attack also showed a similar pattern i.e. 32.8 to 34.4 percent in autumn planted followed by 28.2 to

31.8 percent in the spring planted and only 21.4 to 29.9 percent in the ratoon. The rainfall seemed to be the major environmental factor, which affected the incidence of borer during the period of crop growth. The difference in incidence during July and at the time of harvest in the autumn planted spring plemted and ratoon crop was not significant.

Chaudhary (1981) estimated that the total loss in yield in Bihar, U.P.,

Haryana and Punjab to be about 3.32 million tonnes. The loss in sugar, Khandsari and Joggery (Gur.) production was 0.65 million tormes, with a loss to white sugar manufactures along being 0.11 million tones.

Singh (1983) recorded that the October 1963, the Chilo auricilins damage reached upto 100 percent in some after cane varieties at Golagokarannath, Rosa and Pantnagar in U.P. He found that the attack of the pest in some sugar fields at

Jorhat (Assam) during December 1961 to February 1962 was 30 to 80 percent. The incidence of stalk borer increased from July to November, 1971

averaging to 63.8 percent, but the incidence increased July to November which

was 7.1, 31.1, 48.9, 52.4 and 67.0 percent in the months of July, August,

September, October and November, respectively.

Singh (1983) reported that this pest Chilo auricilius Ddgn. was quite active during August-February its population in water shoots and late shoots was mostly below ground level.

Tanwar and Bajpai (1993) found the incidence of Chilo auricilius Ddgn. in I.I.S.R. Lucknow.

Mann and Doomra (1996) found the incidence of Chilo auricilius in the control plot (have no treatment) 57.6 and 61.0 percent in September and December respectively. In another set of experiment, this pest had incidence as 34 to 50 percent.

Pandya et al. (1996) recorded the incidence of stalk borer in Gujrat which was maximum in November (2.24%) and minimum (0.13%) in July.

Jena and Patnaik (1996) reported weight loss in var. 85 A-261 caused by

Chilo auricilius which was 6.11 and 10.6 percent lowest and highest respectively.

Singh et aL (1997) stated that incidence of stalk borer Chilo auricilius which was 5.5, 3.1 and 0.5, 6.2; 4.9 and 0.8, 8.1; 5.8 and 2.1 percent autumn, spring and late spring planted crops for the year 1990-91, 1991-92 and 1992-93, respectively. Jena et at. (1997) estimated in the field studies conducted in Orrisa, India, during 1992-94, earthing up in May and June, detrashing cane and removing shoots and applying fertilizers during the pre-monsoon season, were effective for the control of stalk borer C. auricilius infesting sugarcane (Co 62175).

Jena and Patnaik (1997) studied the seasonal activities of Chilo auricilius, the pest remained active from fourth week of June till November when the maximum temperature remained between 32.5°C and 36.1^C and relative humidity between 71.3 and 79.5% percent.

Management

Yadav and Sharma (1975) reported Monocrotophos at 1.25 kg/ha gave good control of C. auricilius when sprayed 4 times at 20-day intervals starting in mid-October. Fenitrothion, endrin.

Anonymous (1981) estimated in the 2-year trails with the sugarcane Co.

1148, Monocrotophos at 075 kg/ha applied 3-4 times between mid July and mid

October gave good control of C. auricilius and increased cane yield S. excerptalis by up to 78.63 percent. Phorate 10 G and aldrin 30 Ec gave the highest productivity (24 percent additional cane productivity).

Sandhu and Waraitch (1982) reported borers, including the top borer

(Scirpophaga nivella F.) and the shoot borer (Chilo infuscatellus Sn.) are important pests of sugarcane in northern India. The results were given of tests carried out between 1975 and 1980 in which fensulfothion, carbofliran and aldicarb were evaluated for the control of these borers. Fensulfothion at 1 or 2 kg/ha in 1978-79 and at 2 kg/ha in 1979-80 gave results similar to those afforded by carbofuran at 1 kg/ha, which was the recommended dose for the control of

S. nivella. In some of the tests, fensulfothion and carbofuran also controlled C. infuscatellus when applied as a pre-pianting treatment. Aldicarb gave inferior results.

Johnson (1985) estimated the effectiveness of various insecticides for the control of Eoreuma leftini, a stalk borer of sugarcane and other gramineous species was determined in 2 experiments in sugarcane fields in the lower Rio

Grande Valley to Texas in 1981.

Dubey et al. (1988) reported the relationship between meteorological factors and population of the pyralid Chilo auricilius on sugarcane was studied in

UP, India. Relative humidity had the highest correlation with infestations. Hours of sunshine and temperature.

Anonymous (1991) reported in the field experiments in Kamataka, India, sugarcane (variety Co. 1148) was sprayed with Monocrotophos to maintain infestations of Chilo auricilius at 26-50, 51-57 and 76-100 percent in different plots. The damage caused by the different infestation was assessed and it was conducted that the economic threshold was 15-16 larvae/6 m row lengths.

Singla and Duhra (1992) estimated the trails with 5 insecticides against the pyralid Chilo auricilius on sugarcane in the Punjab, India, in 1986-87, 2 sprays with cypermethrin at 0.1 kg a.i./ha gave the best results. Sprays started in July gave better results than those in September.

13 Yadav et al. (1992) reported in field trials in Haryana, India, heptachlor,

carbofuran and Monocrotophos were tested alone and in combination against pests

of sugarcane. Heptachlor was effective in reducing damage by termites and Chilo

infuscatellus. Carbofuran was effective against Scirpophage excerptalis.

Heptachlor in combination with Monocrotophos and detrashing was effective

against C. auricilins. Heptachlor plus carbofuran gave the highest yields, followed

by all 3 insecticides applied together combined with detrashing.

Singla and Duhra (1992) conducted the trials with 5 insecticides for the

control of Chilo auricilins on sugarcane in the Punjab, India, concluded that two

cypermethrin at 0.1 kg a.i. /ha gave the best results. Sprays started in July gave

better results than those in September.

Jena et aL (1994) studied the efficacy of seven insecticides against the

Chilo auricilius and Sciropophaga excerptalis on sugarcane during Kharif seasons

of 1991-93 in Orrisa, India. Incorporation of carbofuron 3 G at 1.5 kg a.i./ha resulted in 40.66 percent reduction of infestation with Chilo auricilius and gave the highest productivity (152.07 t/ha). Aldrin 30 EC considerably reduced infestation with of 3 regression equations tested, the coefficient of determination was best described by y = 0.38 x 1.325 were Y is the percentage intensity and X the percentage incidence (r2 = 0.92). Based on this equation, percentage intensity could be determined by observation of the percentage incidence of the pest in sugarcane stalks without the need to split open the canes.

14 Sardana (1996) reported the pyralid Chilo auricilim was studied on

sugarcane in Haryana, India, during 1990-92. Based on the damage severity' and

commercial cane sugar yield, the economic injury level was determined as 17.83-

larvae/6m rows. The distribution of larvae on sugarcane, as indicated by the

measure of dispersion, K and variance and mean values, followed a negative binomial pattern. A sequential sampling during September - December were also important.

Plant extracts as biopesticide

To evaluated the bioefficacy of plants extract Bougainvillea spp.,

Calotropis jun (wild), Hibiscus rosasinensis and Nerium indicum Mill against

Sitophilus oryzae Linn. Rao (1955 and 1957), the Cannabis sativa L. plant extracts against Diacrisia oblique (Walker). Deshmukh et al. (1979), the plant extract Momordica charantia L. against Athalia proxime Klug. Kumar et al.

(1979), Euphorbia roylequa Boisd. Aloe barbadensis Mill, Acorus calamus rhizome and Lantana camara L. against Athelie proxima Klug. Pandey et al.

(1979), garlic extract against Spodoptera litura fab. and Euproctis sp. and

Capsicum frutescens Lirm against Sitophilus oryzae Linn. Kirtaniya et al. (1980), the Callophyllum mophyllum Linn (undi oil) against Callosobruchus maculatus fab. Jadhav and Jadhav (1984), Clerondendron sp. Eupatorium sp., Nerium sp.

(benzenoeat) G. and Henosepilachna vigintoctopunctata fab. Saradamma and

Reddy (1988), Annona squamosa petroleum ether seed extract Gynandropsis

15 panthaphylla DC. Hydrocarpus octandre against Nilaparvata lugens stal and

Tribolium castenieum.

Kirtaniya et al. (1980) observed the insecticidal properties of different fractions of fruits of chilli, Capsicum frutescens Linn, was evaluated against S. oryzae. The petroleum ether and methanol fractions gave cent- percent mortality.

Sayed (1982) reported that 2 percent suspension of the ground seeds of neem reduced the number of eggs laid by the female of Spodoptera litoralis

(Boisd.) on treated leaves as compared to untreated leaves. Bowry et al. (1984) evaluated seed and cake powder of neem, linseed, castor, mahua and mustard as a grain protectant against S. oryzae. These plant products were not only effectively reducing the oviposition but also minimizing the damage of maize grain. The effectiveness was in the following order neem > linseed > mustard > mahua > castor.

Jadhav and Jadhav (1984) observed the efficacy of various plant products such as dried A.indica leaves and kernel powder, powder of A. calamus., A. squamosa, Adhatoda vasica, Artatabotrys spp., Bougainvillia spp., Caesaloinia spp., Carium roxyburghiarum Benth., Chrysanthemum cinerarifolium Vis.,

Cierodendron inern, Curcuma longa, Ipomea cornea L., Nerium odorum Soland.,

Zingiber officinale , Piper nigrum Lirm. and A. indica have been tested against pulse beetle, Callosobruchus chinensis Linn, by many workers

(Subramaniam (1942); Paul et al. (1963); Girish and Jain (1975); Janzen et al., (1976). Jaipal and Singh (1985) conducted an experiment to test the effect of

extracts of five common plants. On three days old S"' instar nymph of Dysdercus

koenigii Fabr. on reproductive behaviour. Although extracts of all the plants adversely affected reproduction, but neem {A. indica) had the greatest effects. The results indicated that when treated males were mated with treated female, the fecundity, fertility, egg hatching and survival of the Fi generations were considerably reduced, while feeding and copulatory behaviour were relatively unaffected.

Hellpap and Mercado (1986) studied the effect of petroleum ether extract of neem on the oviposition behaviour of the noctuid moth, Spodoptera frugiperda

Smith. They concluded that the antioviposition effect was maximum in complete darkness.

Misbra et al. (1992) evaluated in the experiments in several plant products tested against Sitophiliis oryzae on wheat seeds, custard apple {Annona squamosa) seed powder and neem seed powder were the most effective with regard to percentage damaged grains, percentage grain weight loss and average adult population. It is suggested that these extracts would provide a cheap means of grain protection, as the plants grow wild in Orissa.

Tiwari (1993) studied and tested in the experiment the Twenty-two medicinal plant powders, ash of plant origin and sorbic acid were tested as grain protectants at 1% (w/w) against Sitophilus oryzae in wheat grains. Sorbic acid and a product of Acorus calamus significantly reduced kernel infestation and Fl

17 progeny production of the weevil. In tests with different concentration of these 2

substances, the plant product at 0.50% and sorbic acid at 0.25% were both

effective.

Dai et al. (1997) conducted the laboratory and field condition to tests on the

effect of a bioinsecticide (G-P compound, germ metabolite and plant extract

compound bioinsecticide) on Aphis glycines and its natural enemies in soyabean

fields.

Pandey ei al. (1998) evaluated in the field experiments of plant products as

insecticides for the control of .S. excerptalis. The lowest number of pests (6.35 and

6.17%) was observed following treatment with Eucalyptus rostrata (3%) compared to the untreated control (16.88 and 15.77%) during 1989-90 and 1990-

91, respectively, followed by Azadirachta indica and E. rostrata (2% solution).

Sahayaraj and Paulraj (1998) carried out a laboratory study to evaluate the effect of water extracts of four plant leaves in insect pest control. Various concentrations, of the extracts (0.5, 1, 2, 4 and 6%) were used against last instar larvae of the groundnut pest Spodoptera litura. Calotropis gigantea was found to be the most toxic plant product followed by Vitex negundo. Azadirachta indica and Pongamia glabra (P. pinnata).

Umoetok and Okokon (1999) studied and tested the toxicity of Dennettia tripetala powder, a natural plant product, and pirimiphos-methyl (1% Actellic dust) was investigated for the control of Callosobruchus maculates (F.) under laboratoryconditions. C. maculatus is a major pestof cowpea seeds in the field and

18 in storage. Five concentrations (0.5, 5.0, 50, 75 and 100 g/kg) of each

chemicalwere used, with an untreated control. Each concentration was introduced

into a plastic pot containing 10 C. maculatus individuals in 20 g of the cowpea

seeds. D. tripetala seed powder and pirimiphos-methyl resulted in 100% mortality within 72 h and cowpea seeds were protected from damage by the bruchids. There was no significant difference between the pirimiphos-methyl and D. tripetala treatments at the higher concentrations.

Non - edible seed oils as biopesticide

Anand et ai (1980) tested the Plant products against 2 major insect pests of stored paddy, viz., Sitotroga cerealella and Rhyzopertha Dominica to find out their effectiveness as grain protectants at 10-350 ppm. Concn. The larvae and adults of the pests were counted after the completion of one generation in treated grains. The order of effectiveness was Malathion greater than pyrethrum greater than garlic extract greater than neem oil greater than oil neem extract greater than onion extract for S. cerealella and Malathion greater than pyrethrum greater than garlic extract greater than neem oil = neem extract greater than onion extract for

R. dominica.

Goswami and Vijayalakshmi (1987) reported in Larval hatch for egg masses of M. incognifta soaked in aqueous extracts of Cassia fistula. Acacia

Arabica {A. nilotica), Eclipta alba, Swertia chirata. Datura metel and Argemone mexicana and oil seed cakes of Carthamus tinctorius, Madhuca indica (M.

19 longifolia), robusta and Calophyllum inophyllum was studied. All were

inhibitory.

Srivastava and Agrawal (1988) tested in the essential oils of Mentha arvensis. Eucalyptus globules, Cymbopogan winterianus and C. martini were tested against Callosobruchus chinensis on seeds of red gram (Cajanus cajan). At a concentration of 0.1%, Cymbopogan martini was the most effective in preventing oviposition (18.66 eggs/adult 90 days after insect release). At 0.2%, M. arvensis was effective and gave complete control of oviposition. Similar results were obtained for adult emergence. It is concluded that the essential oils of M arvensis and C. martini at 0.2%, and of E. globulus and C. winterianus at 0.4% could be used for the control of Callosobruchus chinensis on Cajanus cajan.

Bhatnagar and Anuj (1995) estimated in the ovicidal activity of non- edible oils (A. indica, Pongamia pinnata, Madhuca longifolia and Ricinus communis oils) against 1 -, 2 - and 3-day-old eggs of Chilo partellus was determined in the laboratory at ll^C and 75-85% RH. Egg masses were dipped in

2, 4, 8, 10 and 20% oil for A. indica and P. pinnata oils reduced the survival of eggs. Two- and 3-day-old eggs were comperatively more susceptible to the action of these oils than 1-day-old eggs. The LC50S of A. indica and P. pinnata oils was

0.036094 and 0.039858, respectively, against 2-day-old eggs, and 0.035396 and

0.037622 against 3-day-old eggs. The other 2 oils were less effective.

Razzaq et al. (1996) reported in a two years study on the comparative efficacy of Neem Oil at different comcentration i.e. 2%, 4% and 6% was carried

20 out a Faisalabad during 1994 and 1995 on sugarcane variety BL -4. the data during

1994 and 1995 revealed that minimum sugarcane borers infestation 5.85 and

4.15% with maximum stripped cane yield 501.73 and 484.33 quintal/acre was

recorded where Neem Oil 6% concentration was applied followed by 7.67 and

5.96% borers infestation with stripped cane yield 425.38 and 395.71 quintal per

acre where Neem Oil 4% concentration was applied. In check treatment sugarcane

borers infestation 10.70 and 12.62% with stripped cane yield 353.47 and 306.75

quintal per acre was recorded during 1994 and 1995 respectively. However, Neem

Oil 6% concentration was found better than other treatments regarding infestation

and sugarcane yield.

Sardana and H.R. (2001) reported in nine treatments consisting of the

fungal pathogen (), neem seed kernel extract (NSKE, 10%), neem oil (5%), Regent 0.3 G (fipronil, at 0.20 kg litre- 1 ha- 1), Regent 5 SC (0.25

kg litre- 1 ha- 1), Confidor (imidacloprid, at 0.05 kg litre- 1/ha), chlorpyrifos 20

EC (1.5 kg litre- 1 ha- 1), carbofuran 3 G (1.5 kg litre- 1 ha- 1) and an untreated control were tested for their effecacyagainst the root borer, Emmalocera depressella, of sugarcane (cv. Co 89003) in a field experiment conducted in

Kamal, Haryana, India during 1998-99 and 1999-2000. the application of imidacloprid, carbofliran and NSKE significantly reduced the incidence of root borer by 15.5, 19.0, and 18.5%, respectively, compared to the untreated control

(35.2%). During 1999-2000, only imidacloprid was effective in reducing the

21 incidence (22.3%) over the untreated control (39.5%) and the pretreatment

incidence (40.7%).

Pawar and Pushpa (2004) estimated the extracts reported extracts and

purified extracts of seeds of two plant species, Madhuca latifolia and Calophyllum

inophyllum when evaluated against the 2" instar larvae of Helicoverpa armigera

reared on synthetic diet, exhibited high larval mortality, prolongation of

developmental period, morphological deformities and highly significant reduction

in adult emergence. The reduction in larval weights in the treatments was also

highly significant.

Toxic effects of A. indica products on insects A. indica extract/product

The A. indica tested against different insect pests viz. Spodoptera litura and

Brevicoryne brassicae L (Gujar 1983, Jaipal 1985 and Singh 1986) they were

found better results in the experiment.

Gahukar (1988) investigated the efficacy of neem cake extract at 1 and 3

kg a.i./ha against insect pests of groundnut and compared with treatments of

cypermethrin at 70 g a.i. and dimethoate with deltamethrin at 41 g a.i./ha in

Senegal in 1986. The major insect pest was the noctuid H. armigera, but a number of Coleopterans, notably Anaemeriis fuscus and Brachycerus granulatus, were also observed. The neem extracts and treatment of dimethoate with deltamethrin gave satisfactory control of all the insect pests.

22 Chari et al. (1990) studied and tested the bio-efflcacy of 9 neem

fonnulations viz. Margosan-0 (0.0018%). neemrich- II (0.1%), F6 (0.75%),

Repelin (1%), Wellgro (2%), Neemark (0.01%), dichloroethane extract (DCE)

(1%), alcoholic extract (1%), neem oil emulsion (NOE) (2%) and NSKS in water

(2%) against S. litura in tobacco nurseries. These neem formulations differed

significantly in protecting tobacco from the S. litura both in laboratory and

nursery. In laboratory tests, Repelin, DCE and NSKS gave better protection than

all other neem formulations. Margosan-0 and neem rich-II were the next best

treatments. Mortality of larvae was also observed and it was 66.7 and 33.3 percent

for Margosan-0, 33.3 and 66.7 percent for Repelin in 1988 and 1989, respectively.

In nursery tests, Repelin, DCE and NSKS gave significant protection to tobacco

seedlings at 9 days after spraying. It is concluded that apart from NSKS (2%) in

water, Repelin (1%) and DCE (1%) were most effective in protecting tobacco

seedlings form S. litura damage followed by Margosan-0 (0.0018%), neemrich -

II (0.1%), alcoholic extract (1%) and Wellgro (2%).

Sehgal and Ujagir (1990) investigated the bioefficacy of synthetic

pyrethroids, neem extracts and other insecticides for the control of H. armigera.

Among the insecticides tested for 2 or more years, cypermethrin (36 and 45 g/ha),

deltamethrin (12 g/ha), fenvalerate (120 g/ha), Endosulfan (420 g/ha) and

Monocrotophos (24 g/ha) significantly and consistently reduced pod damage to

<22.5 percent, giving grain yields of > 1.7 t/ha. Less effective but still

23 significantly better than the control were quinalphos at 300 g, HCH at 2600 g and

chlorpyrifos at 240 g/ha, and NSKE at 5 percent.

Patel et al. (1993) evaluate and tested the extracts of neem, Annona

squamosa, Momordica charantia, Lantana camara, Pongamia glabra, Diospyros

cordifolia and garlic against Amsacta morrei in field cages in Gujarat, India. Five

percent suspension sprays of neem seed and leaf, custard apple seed and leaf,

bitter gourd seed, Lantana leaf, kanzi seed, dheki seed and garlic bulb have been

found considerably effective against 2" instar larvae of ^4. moorii. However, neem

seed was found significantly superior to rest of the treatments by giving 92.22

percent mortality followed by neem leaf extract, which gave 72.22 percent larval

mortality. The custard seed extract gave 36.67 percent larval mortality. The rest of

the extracts gave larval mortality in the range of 46.67 to 54.44 percent.

Robert et aL (1994) studied and tested the biological activity of NSKE and

synthetic azadirachtin against larvae of Plutella xylostella. The activity of two

neem extracts, AZT and NeemAzal (containing 30 and 3 mg azadirachtin ml"',

respectively) and synthetic azadirachtin (AZ) against 2"'^ instar larvae (1.2) off. xylostella was examined using-dip bioassays. On Chinese cabbage, AZ was

significantly (P<0.05) less toxic (3 to 4-fold; LC 50 0.54 ug AZ ml"') than either neem extract against a laboratory strain of P. xylostella (FS). Larval mortality on

13 days was found to increase with increasing exposure time of P. xylostella (FS) larvae to AZT-treated Chinese cabbage, although there was little difference in mortality between 48 and 120 hrs exposure. When AZT, NeemAzal and AZ were

24 applied at a dose (I ug AZ ml'') which gave end-point mortalities between 50 and

90 percent (at day 13). AZT was also shown to have ovicidal activity against P.

xylostella (Wellcome) at relatively high dose ranges (10-1000 ug AZ ml"') as well

as some contact activity (FS strain) in topical bioassays. AZT showed little or no

activity at rates up to 1000 ug AZ ml''. In medium-volume (MV, 200 It ha'') and

ULV (c. lit ha"') spray bioassays on Brussels sprout. AZT gave 16-92 percent and

88-100 percent mortality, respectively (Wellcome strain) at rates approximating to

l-20gAZha"'.

Bhatnagar (1995) evaluated the bioefficacy of plant extracts on eggs of

Chilo partellus, a pest of maize. Several semi-solid crude plant metabolites were isolated by soxhlet-sequential extraction and bioassayed against 3-day-old eggs of

Chilo partellus under laboratory conditions. Petroleum ether fractions of Annona squamosa and Azadirachta indica were the most toxic and these completely inhibited hatching. The LC50 values of these extracts were 0.03545 and 0.03588, respectively.

Behera and Satapathy (1996) did screening of 7 indigenous plant extracts for their insecticidal properties against S. litura. Two treatments were given to 4* instar larvae by exposing them to castor (Ricinus communis) leaves dipped in the extract and by topical application with and atomizer. The concentrations used were

1.25, 2.5, 5.0 and 10.0 percent. NSKE was the most effective, causing 100 percent mortality 10 days after treatment. The other treatments caused 50 percent mortality or less.

25 Sahayaraj and Seker (1996) tested the efficacy of plant extracts against

tobacco caterpillar larvae in groundnut. The leaves of Azadirachta indica (neem),

Vitex negundo, rind of Citrus sinensis (orange) and rhizome of Zingiber officinale

(ginger), 10 g of each, were macerated in hot distilled water and applied to

groundnut leaves to assess their efficacy against larvae of S. litura. Larval

mortality was highest after 96 hrs on leaves treated with extracts of orange (90%),

followed by V. negundo (83%), A. indica (80%) and ginger (70%).

Kiarie and Saxena (1996) evaluated neem extracts against maize stalk borer, Chile partellus Swinh in Coastal Kenya. Neem extract at 3, 6 and 12 percent was sprayed on maize (cv. Coast Composite) for the control of C. partellus. Dipterex (5% G at 10 kg/ha) served as insecticide check and unprotected control plots were maintained. Extracts were sprayed thrice at 3, 4 and 5 weeks after plant emergence on plants which had been infested at 5 larvae (1 to 2 day old) per plant one day before the first spray application. Neem reduced the leaf damage, tunneling, and larval population. Control efficacy increased with the concentration. Neem extract (12%) was at par with dipterex. Yield increases with

3, 6 and 12 percent neem extract were 17, 24 and 28 percent, respectively as compared with 30 percent increase with insecticide.

Facknath (1996) the bio efficacy of .^. indica extracts were found to be successful in breaking down the resistance developed by P. xylostella to some commonly used pyrethroids, namely deltamethrin and cypermethrin, and to have a synergistic effect with the organophosphate prothiofos, both in laboratory

26 bioassays as well as in field trials. Comparable studies on {Melia azederach) extracts did not give significant results. Tamaron which produced 29.3 percent mortality alone killed 88 percent of the larvae when mixed with neem {A. indica) and 86.7 percent when mixed with M. azederach. Larvicidal effect of Cymbush was enhanced from 17.3 to 77.3 percent with neem and 73.3 percent with Melia.

Vyas et al. (1996) investigated the bio efficacy of 4 plant extracts on three important noctuid pests. The data on percentage mortality of E. vittella in case of neem, annona, jatropha and mahua formulations were 58, 89, 68, 21; for H. armigera 100, 100, 60, 76 and for.?, litiira 28, 44, 11 and 5, respectively.

Kulkarni and Joshi (1997) studied and tested the insecticidal action of ^. indica and some other plant extracts against Rhesala imparata. The efficacy of

*methanolic extracts from seeds of A. indica and leaves of Aloe vera, Lantana camara var. aculeate. Datura metel, Ipomoea carnea subsp. Fistulosa and Annona squamosa, was evaluated against larvae of R. imparata in the laboratory. Three concentrations viz. 1, 3 and 5 percent were taken in each case. It was observed that seed extracts of ^4. indica, A. squamosa and L. camara were statistically significant giving 84.35, 81.07 and 84.45 percent mortality after 72 hrs. The performance of neem products at 5 percent was also quite efficacious giving 68.69 percent mortality while at 1 percent, it gives only 27.62 percent mortality.

Erbach et al. (1997) evaluated the bioefficacy of NeemAzal T, NeemAzal

T/S and Delphin on grape berry moth, Lobesia botrana and the predatory mite,

Typhlodromous pyri. Field trials in Germany showed that NeemAzal T and

27 NeemAzal T/S, and Delphin {Bacillus tlmringiensis [subsp. Kurstaki]) provide environmentally friendly alternatives for control of the grape pest L botrana. The treatments caused 58-80 percent mortality of the pest, while there was no measurable difference in the population development of T. pyri between treated and untreated populations.

Flemming (1997) carried out the control measures against the pine pest

Thaumetopoea processionea on a large scale in 1996. Efforts were concentrated on oaks (Quercus spp.) in the north-western region of the country Brandenburg,

Germany. Control rates of nearly 100 percent were obtained with helicopters, but only 70 percent with ground techniques of sprayings. The pesticides tested were

NeemAzal, Delfin and Foray 48 B (both based on Bacillus thringiensis). Foray 48

B applied by helicopters and Deflin applied on the ground were the most effective.

Jaglan et al. (1997) studied and tested in the experiments of seven different plant parts including kernels and leaves of neem {A. indica) in solvent by different methods of extraction, i.e. room temperature extraction method, hot extraction method and Soxhlet extraction method, which were tested at different concentrations against larvae of H. armigera of the three methods employed for extraction to compare their effectiveness, the room temperature extraction gave on average larval mortality 38.7% and hot extraction methods gave larval mortality

37.7%, which were statistically on a par. The Soxhlet extraction method was found to be slignuy interior to the other two methods.

28 Perez et al. (1997) studied and tetsted the effect of A. indica natural

pesticides to control pests of cabbage, com and cowpea. Three natural insecticides,

obtained from crude extracts of neem seeds, were tested against pests in the field

{Plutella xylostella on cabbage and Spodoptera frugiperda on com) as well as in

storage (Acanthoscelides obtectiis on seed cowpea). The experiments were carried

out in Cuba. The following neem tree products and doses were tested: Cubanim-t

(dry powder) at 5 kg/ha/application as a 25 g/lt suspension; Oleonim-80 CE (water

emulsion) at 1.5 It/ha/applied as a 5 ml/it dilution; Oleonim-50 CE at 3

It/ha/applied as a 10 ml/It dilution; as a commercial control. Karate (2.5 EC

lambda - cyhalothrin), at 1.2 It/ha/applied as a 4 ml/It dilution. Cubanim-t

achieved 80 percent efficiency against P. xylostella after 4 applications,

statistically equal to the commercial insecticide (Karate), and decreased pest

intensity from 0.95 to 0.02 larvae/plant by the 4'*' application. S. frugiperda on

maize decreased from 0.65 to 0.07 larvae/plant after 3 sprays with Oleonim 50CE;

from 1.18 to 0.06 with Oleonim 80CE; and from 1.50 to 0.10 with Cubanim-t.

Patel et al. (1998) tested in the field the bio-efficacy of A. indica against

leaf eating caterpillar, S. litura Fab. and Achoea Janata Linn, on castor. The bio- efficacy of Gronim (0.3EC, azadirachtin-based) was tested at 0.0012 and 0.0018 percent and combination with Endosulfan (0.07%) against the pests at Anand,

India during 1995-96 and 1996-97. A mixture of azadirachtin (0.0018%) and

Endosulfan as well as Monocrotophos (0.04%) alone gave cent percent larval mortality of S. litura and Achaoea Janata after 7 and 3 days of their spray,

29 respectively. The higher (0.0018%) dose of azadirachtin was found more effective than its lower (0.0012%) dose against S. litura and A. Janata after 7 and 3 days of spray, respectively.

Singh (1998) carried out some biopesticides against pea bod borer complex. The bioinsecticidal trial was laid out at Mathura, India during two consecutive seasons i.e. rabi, 1994-95 and rabi, 1995-96 to get safer and effective insecticides to control the pests. For this, Nimbicidine, Repelin, Achook, Suneem,

Nethrin (all at 1.5%), Dipel-8 L, Biobit, Biotox, Bioline (all at 0.15%) and

Endosulfan (0.07%) were tested alongwith control. It was evident from the results that all treatments were superior over control. Endosulfan proved to be the best

(0.66% pod damage), followed by Nimbicidine (5%), Suneem (5%), RD-9 Repelin

(5.66%) and Achook (6%).

Gupta et al. (1998) evaluated the bioefficacy of A. indica - based pesticides against different life stages of Helicoverpa armigera. Different life stages of American bollworm H. armigera starting from egg to adult were taken for testing the efficacy of neem - based pesticides (Godrej Achook, neem oil and neem seed powder NSP) under laboratory conditions. The ovicidal action of the commercial formulation of Godrej Achook was not observed. However, dipping of larvae (3*^^ instar) with different concentrations of this product (0.1, 0.25, 0.5, 1.0,

1.5 and 2.0%) was found effective and there was intermediate formation of insect for moderate concentrations and higher mortality with higher concentrations.

30 Srivastava and Proksch (1998) studied and tested the bioactivity of seven

plant extracts against Spodoptera littoralis. Methanol extracts from the 7-plant

species viz. Ageratum conyzoides, A. hoiistonianum, Aglaia roxburghiana, A.

odorata, A. indica. Cedrela toona and Melia azaderach were individually

incorporated in the artificial diet at different concentrations viz. 1, 3, 5, 7 and 9 mg

crude extract (dry vvt) per standardized piece of artificial diet. A batch of thrity

neonates of S. littoralis was released in each concentration and the observations

were recorded on survival of larvae at 6 days after feeding on spiked diet. 10 days

after feeding (6 days on spiked + 4 days on normal diet), and weight gained by the

larvae at 6- and 10 day after feeding. A. conyzoides was slightly more bioactive

than A. soiistonianum owing to slightly higher concentrations of Preconcene II in

it, as evidenced by high performance liquid chromatograms. Amongst Meliaceae,

A. odorata leaves were most active followed by M azaderach stem, leaves and

fruits, A. indica, A. rosburghiana leaves and C. toona leaves. In the second

observations recorded 10 days after feeding all the plant extracts exhibited very

high level of insecticidal activity. At still higher doses survivorship was close to

zero.

Mahadevan (1998) studied and tested the bio efficacy of azadirachtin for

the control of tomato borer, H. armigera. A new neem-based insecticide 'Eco

Neem' PJM 01/94 with an azadirachtin content of 0.3 percent was tested against the pest during the winter and summer seasons of 1994 in Tamil Nadu, India. A total of 2 rounds of spray were given at 15- day intervals. Damage was recorded

31 on days 3, 7 and 15, after each spray. The results revealed that spraying 2 rounds of EcoNeem at 10 ppm (3.3%) was the best means of controlling the pest. During the winter, spraying of Monocrotophos, combined with Endosulfan spray, resulted in only 4.2 percent damage to the crops compared with 6.8 and 28.9 percent damage for EcoNeem (10 ppm)- treated and untreated crops, respectively.

Sahayraj and Paulraj (1998) screened the relative toxicity of some plant products against groundnut pest, S. litura. A laboratory study was carried out to evaluate the effect of water extracts of 4 plant leaves in insect pest control.

Various concentrations, of the extracts (0.5, 1, 2, 4 and 6%) were used against last- instar larvae of the groundnut pest. Calotropis gigantea was found to be the most toxic plant product followed by Vitex negundo, Azadirachta indica and Pongamia glabra.

Nestor et al. (1998) studied the mortality of leafminer, Phyllocnistis citrella with oil and neem products. The effect of mineral oil (Citrolina) and neem on the mortality of P. citrella, was determined in 3-year-old Persian lime {Citrus aurantifolia) orchards at Cuitlahuac, Veracruz, Mexico. The concentrations tested were: 2, 5 and 8 percent Citrolina, 30 percent neem and 50 g of ground neem seed/It of water. The treatments were applied to shoots with different instar larvae. The most effective level of control was obtained with 5 percent Citrolina and 50 g neem/lt of water, with mortalities of 72.7 and 70.5 percent, respectively. Mortality was observed between 24 and 36 hrs following the application of Citrolina, and between 48 and 72 hrs for neem.

32 Dhawan et al. (1998) evaluated the different biopesticides against H. armigera. The efficiency of commercially available formulations of B. thuringiensis subsp. Kurstaki (Dipel, Bioasp and Biolep), neem {A. indica)

(Nimbecidine, Neemgold and NeemAzal) and insect growth regulators (lufenuron, flufenoxuron and RH- 2485 a diacylhydriazne) were tested against H. armigera larvae. All the 3 formulations of B. thuringiensis at the rate of 1.50 kg/it/ha were as effective as quinalphos against the young lar\'ae. Neem-based insecticides were significantly inferior to standards, quinalphos and chlorpyrifos against young and mature larvae except NeemAzal, which was as effective as quinalphos against young larvae. In another experiment, Dipel, Nimbecidine and lufenuron were evaluated against H. armigera population collected from Ludhiana, Bamala and

Bhatinda, Punjab (India) and the data showed variation in susceptibility to the pest. The Bamala population was comparatively more susceptible to all the 3 biopesticides. Similarly, the Bhatinda population was more susceptible to

Nimbecidine and Dipel.

Dhembare et aL (1998) investigated the potential use of plant extracts as control agents of M scyrodes on ber fruit { mauritiana). Extracts from 11 plant species were obtained using methanol as the solvent. Extracts were put on ber fruit in petri plates. Ten M. scyrodes larvae were released on to each plate and mortality was assessed after 12-48 hrs. Mortality was compared to that in a standard Endosulfan treatment. Extracts from Annona reticulata, Azadirachta indica and Ocimum sanctum gave effective control, 64, 70.3 and 63.3 percent mortality after 48 hrs with 1 percent, respectively, compared to 73.3 percent

mortality with Endosulfan.

Das (1998) carried out in the experiments the synergistic action of NSKE

against pests of pigeonpea. During field experiments in Madhya Pradesh, India, in

the kharif season of 1997-98, four insecticides and a NSKE alone or in

combinations in half doses were tested against Melanagromyza obtusa and

H. armigera. The lowest damage and highest grain yield were obtained using

dimethoate (0.15%) + NSKE (5%).

Sahayraj and Paulraj (1998) studied and tested the relative toxicity of

some plant extracts to groundnut leaf miner, Aproaerema modicella. Larvae of this pest were exposed to neem {A. indica), Pongamia glabra and Calotropis gigantean extracts (0.5-6%) for 4 days. All the plant extracts were toxic. The larval mortality was highest (63-75%) at the highest concentration.

Singh and Pandey (1998) conducted a field trial using NDR 637 in kharif

1995 and Pusa Basmati in kharif 1996 to test the efficacy of seven A. indica products viz. Nimbecidine, Neemax, Neemgold, Econeem, NeemAzal, fortune

Aza and Achook along with Durmet a chemical check against yellow stem borer,

Scirpophaga incertulas Walk. During both the years, all botanicals were at par in controlling the pest and in increasing the yield over control except Fortune Aza.

Neemgold was found superior in producing higher yield and minimising incidence.

34 Pareek and Batta (1998) did in the laboratory and field condition to evaluation of plant products against maize stem borer, Chilo partellus Swinhoe.

Plant products viz. neem seed kernel, neem oil. Datura, Papaya, Ghikanvar, Aak,

Tulsi see, Mint, Henna, Ipomea, Garlic, Clove and Lantana were evaluated against the pest. Neem oil (1%) was found most effective giving highest mortality after

12, 24 and 48 hrs of treatment. The neem seed oil (0.5 and 1%), neem seed kernel

(5 and 10%) and Ghikanvar (50%) was also studied on the development of the borer. All the plant products tested significantly lowered down the survival of larvae, larval population, adult emergence, longevity and growth index as compared to control.

Patel et aL (1998) studied and tested the bio-efficacy of some neem-based formulations against hairy caterpillar, infested Amla. The neem- based formulations and plant materials NSKS (5%), neem leaf extract (NLE 5%),

Parasmani (0.2%), Neemark (1%), Nimbicidine (0.2%), Repelin (1%) and Gronim

(0.4%) were evaluated for their bio-efficacy against S. celtis in Amla (Gujrat-1).

NSKS was found more effective than all the neem-based formulations tested against S. celtis.

Sarode and Gabhane (1998) evaluated and compared the efficacy of 13 insecticidal treatments viz. NSKE (5%), Endosulfan (0.06%), Monocrotophos

(0.05%), Malathion (0.05%), NSKE + 3/4"' dose of Endosulfan, NSKE + 3/4'*' dose of Monocrotophos, NSKE + 3/4^^ dose of Malathion, NSKE + IM*^ dose of

Endosulfan, NSKE + IM'^ dose of Monocrotophos, NSKE + IM"" dose of

35 Malathion and the control against Earias vittella. The data indicated that all the

treatments were significantly superior over control. Endosulfan (0.06%) was the

most effective treatment. However, the treatments NSKE (5%) + 3/4"" dose of

Endosulfan (0.045%), Monocrotophos (0.5%) and NSKE (5%) + 1/2 dose of

Endosulfan recorded 13.05, 14.50 and 15.28 percent fruit damage, respectively

were observed promising.

Nelson and Logiswaran (1998) carried out the efficacy of insecticides against Nephopteryx eugraphella Ragonot. The insecticides tested were carbaryl

(0.1%) phosalone (0.05%), Monocrotophos (0.03%), quinalphos (0.05%), Dipel

(0.05%), NSKE (5%) and untreated control. It was observed that on 14^^ day after treatment, carbaryl (0.1%) was the best treatment followed by Dipel (0.05%) and

NSKE (5%) and phosphamidon (0.05%) recording 11.13, 12.25, 12.25, 12.50 percent bud damage, respectively against control 21.88 percent. The carbaryl and

NSKE controlled bud damage effectively and recorded high cost benefit ratio.

Pandey and Singh (1998) evaluated the natural products as an insecticide against top borer, Scirpophaga excerptalis Walker in sugarcane. The treatments taken were 1, 2, and 3 percent extract of Eucalyptus rostrata leaves; 1, 2 and 3 percent extract of neem {Azadirachta indicd) leaves; 1, 2 and 3 percent extract madar (Calotropis procera) leaves and the untreated control. The data revealed that least incidence (6.35 and 6.17%) of top borer was recorded in 3 percent E. rostrata leaf extract compared to control (16.88 and 15.77%) in two years trial.

This was followed by 2 percent neem leaf extract. Incidence of the borer was

36 10.62 and 7.02 percent, respectively in two trials. It is, therefore, proposed that

these natural products can be exploited in integrated insect pest management to

control this pest.

Sahayraj and Paulraj (1998) carried out the bio efficacy of A. indica

extracts on Amsacta albertriga. When applied in the laboratory against S^'-instar

larvae of A. albistriga, NLE caused 8.33, 13.33, 23.33, 36.66 and 85.71 percent

mortality at 0.5, 1.0, 2.0, 4.0 and 6.0 percent, respectively. Mortality of pupae

treated with the lower concentrations was 22.73 percent; the higher concentrations

did not affect the pupae. Adult emergence was 30 percent in the control,

decreasing to 14.11 percent when treated at 0.5 percent and 10.76 percent at 1

percent. Adults resulting form treated lar\'ae laid no eggs.

Agrawal et al. (1998) studied and tested some A. indica formulations viz.

Neemarin, NeemAzal, Econeem, Achook and Nimbecidine at 1 percent

concentration against silkworm, Bombyx mori, larvae under laboratory conditions.

Mulberry, Morns alba leaves were dipped in the experimental petridishes where in the larvae were released for feeding. In control, only water-treated leaves were kept. The results showed that silkworm larvae started dying after 3'^'^ day of treatment and continued upto 5'*' and 7'*' day of treatment. Amongst the different neem products Neemarin proved better followed by NeemAzal and the actual cumulative mortality percentage was 55.83 and 52.47 percent, respectively.

Achook proved to be third effective neem product which resulted in 45.82 percent cumulative mortality within 3-7 days of treatment. Nimbecidine was least

37 effective formulation with over all mortality percentage of 27.47 percent.

Econeem was slightly better to that of Nimbecidine and registered 29.15 percent mortality.

Vyas et al. (1999) tested the bio efficacy of plant extracts including A. indica products on growth and development of Earias vitella, H. armigera and

S. litura. The effect of methanolic seed extracts of custard apple

(Annona squamosa), wild castor {Jatropha curcas) and mahua {Bassia latifolia) vis-a-vis a commercial neem formulation currently being marketed in India as

Aschook. This formulation is in a water-soluble powder form containing azadirachtin, azadiradion and nimbocinol + eqinimbocinol at 300, 500 and 2000 ppm, respectively. All the three plant extracts and neem formulations Achook were tested at 1 percent concentration against 4-day-old larvae. Larvae were allowed to feed on treated plant material for 24 hrs followed by subsequent transfer to control. Observations were recorded on the percentage larval mortality, time taken for pupation and adult emergence. The data were taken on percent mortality with neem formulation Achook, A. jatropha and B. latifolia extracts were 57.89, 89.47, 68.42 and 21.05 percent for E. vittella, 100, 100, 60, 66 percent for H. armigera, respectively with the above 4 extracts.

Gupta et al. (1999) conducted in the field experiments and evaluated the bio-efficacy of A. indica products against cotton boUworms viz. Earias spp.,

Pectinophora gossypiella and H. armigera and their impact on whitefly, Bemisia tabaci (Gerin.). Neem products were applied alone as well as in combinations with

38 synthetic insecticides against the pests. Neem-based insecticides such as RD-9

Repelin, Nimbecidine, Achook and NeemAZ and bioinsecticides Bt were evaluated alone and in combinations of chemical insecticides against pest complex in cotton crop. The experiments were done in RBD with three replications.

Observations were recorded on the incidence of boUworm on locule basis in green bolls and open bolls in randomly selected plants. The percent incidences of bollworms are subjected to angular transformations for statistical analysis. Data were also taken on whitefly infestation. The observation recorded revealed that the application of neem alone or in combination with Bt formulations or broad- spectrum conventional insecticides failed to check the incidence of bollworms.

However, neem in combination with one spray of synthetic pyrethroids gave significant control of bollworms, as minimum incidence (10.8, 18.2%) and maximum yield of seed cotton (1970, 1819 kg/ha) were noted.

Chari et al. (1999) studied and tested in the laboratory and field experiments with neem {A. indica), pongamia (P. pinnata) and chinaberry (M azedarach) extracts and commercial neem formulations against tobacco caterpillar, S. litura. Three neem formulations - NeemAzal FI containing 10,000 ppm azadirachtin (AZA) at 50 and 30 ppm, NeemAzal FII containing 50,000 ppm

AZA, Fortune Aza containing 11,000 and 1500 ppm AZA at 50, 30 and 15 ppm concentrations and neem {A. indica) extracts (CTRI-I, II and DOR-I) containing

15,000 ppm AZA, CTRI-III containing 80,000 ppm AZA, CTRI-IV containing

30,000 ppm AZA, all at 50 ppm concentrations, 1.5 percent oil and seed extract of

39 chinaberry (DOR-II) at 0.005 percent a.i. and four pongamia seed extracts (1%) including pongamia oil (1.5%) were evaluated in comparison with aqueous NSKS

(2%) and chlorpyrifos (0.05%) in the laboratory and nursery against S. litura during the 1994 and 1995. Results revealed that NeemAzal FI and II (50 ppm),

NSKS (2%) and chlorpyrifos (0.05%) gave significant protection to tobacco seedlings from the Spodoptera damage followed by NeemAzal FII (25ppm) and

NeemAzal FI (30 ppm). Fortune Aza (50 ppm) gave equal protection as chlorpyrifos (0.05%) and NSKS (2%) up to 9 days after spraying. These results confirm the earlier findings that neem formulations at 30 ppm AZA concentrations could effectively protect the tobacco seedlings from the Spodoptera damage up to

9 days after spray. All the neem extracts were significantly more effective against

S. litura on tobacco than pongamia treatments. Neem oil (1.5%) was found highly effective and on par with NSKS (2%), chlorpyrifos and CTRI-III neem extract.

Leaf

Degaonkar et ai (1988) tested five insecticides i.e. P. pinnata (karanja oil)

(0.2%) + soap (1%), NSKE (5%) + soap (1%), neem leaf extract (5%), BHC (10% dust), Endosulfan (0.07%) and untreated control against H. armigera and

Agromyza (Melanagromyza) obtusa. They also investigated the cost benefits on

Arhar in Maharashtra, India. The data revealed that all the treatments were significantly superior over control in reducing the pod damage. The data of economics for the control of Arhar pod borer complex alongwith cost details were also evaluated and it was observed that best cost-benefit ratio was with BHC

40 (HCH lOD), followed by Endosulfan (0.07%) and neem leaf extract (5%).

Chaudhry (1992) evaluated the bioefficacy of botanical pesticides against

Plecoptera reflexa Guen, a shisham () defoliator. Aqueous

extracts of different parts of 4 plants (A. indica, Dutura alba, Melia azedarach,

Calotropis procera) were tested for control of larvae of P. reflexa plantations in

Pakistan. In the case of ^4. indica and M. azedarach, the seed powder was used for making a 10 percent water extract, and for D. alba and C. procefa leaves, branches and stems were boiled in water to make 15 and 21 percent decoctions, respectively. AH the tests extracts gave significant mortality with the maximum by

D. alba (90%), followed by A. indica (73.3%), C procera (66.6%) and M azedarach (60%). Control mortality was 13.3 percent.

Anwar et al. (1992) studied the insecticidal activity against 4 major pests in . Acidified alcohol extracts from flowers and leaves oiAesculus indica caused up to 75 percent mortality of Saccharicoccus sacchari. Leaf extracts from

Schinus molle and leaf and flower extracts from A. indica caused 60-70 percent mortality of larvae of Scirpophaga incertulas. Azadirachta indica leaf powder fed to H. armigera caused failiure of pupation and adult emergence. Significant mortality (60-90%) was observed in adults of Pyrilla perpmilla treated with extracts from leaves of .4. indica, Dryopteris ramosa and S. molle.

Seed Prashad et al. (1986) carried out the field trials in Andhra Pradesh, India, the relative effectiveness of deltamethrin (0.0015%), fenvalerate (0.01%),

41 dicarbasulf (thiocarb) (0.044%). chlorpyrifos (0.026%) and neem seed kernel suspension (NSKS) in water (2% in the nursery and 0.5%) in tiie planted crop) against Spodoptera litura in F.C.V. tobacco both in the nursery and on the transplanted crop. All the insecticides and NSKS gave protection against damage by S. litura. In the nursery, deltamethrin gave maximum protection 2 days after spraying, while after 9 days thiodicarb was the most effective compound, followed by deltamethrin and fenvalerate, which were equally effective and superior to

NSKS and chlorpyrifos. Laboraton.' studies on the persistence of toxicity showed that thiodicarb was the most persistent, causing 100 percent mortality for up to 13 days, followed by deltamethrin (8 days), fenvalerate (7 days) and chlorpyrifos (3 days) and tested the bioefficacy oiA. indica seed extracts against Myllocerus discolor Boheman and Maruca testnalis Geyer. Sankaran et al. (1986)

Parmar et al. (1987) compared the physio-chemical characteristics, shelf life and relative efficacy of 3 neem formulations. A water dispersible powder

(WDP) (25% w/w) and a dust preparation (10%) w/w) both based on crushed neem seed kernels and dj\ emulsifiable concentrate (25% w/w) based on neem seed oil, were evaluated in laboratory bioassaysat 28*^C and 75 percent RH with 2"'* to 5'^ instar larvae of the arctid Spilosoma obliqua. All 3 formulations controlled the larvae. The WDP and the emulsifiable concentrate (both at 1%) were compared with conventional insecticides in the field against the Lycaenid euchrysops cnejus on green gram (Vigna rodiatd) and cowpeas (F. unguiculatd) in India. The neem formulations gave a level control, which was comparable to that of cypermethrin

42 (0.007%), flucythrinate (0.0075%), fenvalerate (0.01%), quinalphos (0.05%),

Malathion (0.05%), neem oil synergized Malathion EC (oil 1%, Malathion,

0.05%) and Endosulfan (0.07%).

Fagoonee et at. (1987) carried out in the field experiments, Mauritius on

Chinese cabbages, cabbages and cauliflowers that neem seed kernel extract

(NSKE) was to be as effective as deltamethrin (Decis) against P. xylostella and

Helicoverpa armigera on tomatoes. The use of the neem extract alternately with

the insecticide gave the best protection against the latter pest.

Ram Prashad et al. (1987) carried out a field trial in Andhra Pradesh,

India, to determine the effectiveness of a 2 percent NSKS, cypermethrin

(0.0025%), fenvalerate (0.01%), methamidiphos (0.053%), phenthoate (0.067%.),

BPMC (fenobucarb) (0.09%), etrimfos (0.05%) and Endosulfan (0.047%) against

S. litura in tobacco nurseries. The number of leaves damaged in each bed was

recorded 2 and 9 days after spraying and the percentage of leaves damaged was

calculated out by counting the total number of leaves on 10 randomly selected

seedlings in each bed. The mean seed kernel suspension was as effective as

fenvalerate, cypermethrin or methamidophos. Phenthoate, fenobucarb, etrimfos

and Endosulfan were less effective.

Sombatsiri et al. (1987) compared the toxicity of an aqueous NSKE and an

improved extract in bioassays using S. litura and P. xylostella and in field trials against these species on kale in Thailand. The improved extract was prepared by alcohol and petroleum ether in the extraction process. The LC50 of and aqueous

43 extract against 4 instar larvae of 5. litura was 7.3 percent while that of improved

extract was 0.78 percent. For 2"*^ and 3'"'' instar larvae of P. xylostella, these values

were 0.84 and 8.6 percent, respectively, for the aqueous extract and 0.46 and 4.6

percent for the other extract. When 0.1 percent piperonyl butoxide was added to

the 0.67 percent improved extract, the mortality of 2"'' instar larvae and pupae of

P. xylostella rose from 51.1 to 93.3 percent. In field trials, the improved extract at

a concentration of 33.3 percent gave the best result in reducing populations of 5.

litura and P. xylostella when compared with 1.67 percent improved extract or a

33.3 percent aqueous extract. There was no significant difference in the control

achieved by the 33.3 percent-improved extract and 0.025 percent cypermethrin.

Reddy (1988) reported that the petroleum ether extracts of A. squamosa,

Gynandropsis panthaphylla DC, Hydrocarpus octandra Thue. and Ocimum gratissimum L. (seeds) reduced the oviposition of brown plant hopper, A^. lugens.

Kareem et aL (1988) evaluated the bio efficacy of neem seed bittersat 5000

ppm, 3 percent NSKE and Monocrotophos (0.3 kg a.i./ha) for the control of insect pests on mungbean (Vigna radiata), in a rice-mungbean cropping system in the

Philippines in January-March 1988. Damage by the pyralids Sylepta (Sylepte) sp.,

Lamprosema sp., Etiella sp. and Maruca sp. and the noctuid Heliothis sp. was significantly reduced by all 3 treatments. Yield was greatest in plots treated with

Monocrotophos, but the cost-benefit ratio was greatest for neem seed bitters.

Bhat et aL (1988) conducted field experiments in Kamataka, India, to determine the effectiveness of various insecticidal formulations and of a neem

44 seed extract for the control of Maruca testulalis and Cydia ptychora on cowpea

(Vigna unguiculata). Pest incidence was lowest in plots treated with

Monocrotophos, 250 ml/ha (29.97%) and grain yield was highest (5.75 g/ha),

followed by neem seed extract at 25 kg/ha (42.34%), phosalone at 250 ml/ha

(43.06%) and quinalphos at 250 ml/ha (44.83%), with grain yields of 4.75, 4.70

and 4.14 q/ha, respectively. Dust formulations of folidol (2%), carbaryl (10%),

toxaphene (20%) and quinalphos (5%) each at the rate of 20 kg/ha were less

effective against the pests.

Rwamputa and Schabel (1988) prepared aqueous extracts of neem (A.

indica) seed kernel (0.5 and 1.0%) and of neem leaves (1.0%) from powdered kernel or leaf, and used to soak fresh leaves of Khaya nyasica (host of

Heteronygmia dissimilis), which were subsequently tested in the laboratory as feed for H. dissimilis. First 3"* and last instars of H. dissimilis were used in the test which was carried out for 3 days, using fresh soaked leaves each day. The 1 percent kernel extracts was the most effective preparation, causing cumulative mortality of 100 percent to 1^' instar larvae, and 80 percent to 3'^'' and last instar larvae over 3 days. The 0.5 percent kernel extract was less effective and the leaf extract least effective.

Mikolajczak et aL (1989) carried out the bioefficacy of Meliaceous seed extracts on growth survival of Spodoptera frugiperda (J.E. Smith). Hexane and ethanol extracts of seeds from 10 species of the family Meliaceae were incorporated into a synthetic diet at 10000, 2000, 400, 80 or 16 ppm and fed to

45 neonate larvae of the noctuid S. frugiperda in no-choice tests in the laboratory at

26-28 C, 55-65% RH and continuous darkness. All the extracts produced

significant mortality, reduced the larval growth rate and increased the time to pupation. The 2 highest doses of all the ethanol extracts caused 100 percent mortality before pupation, but the hexane extracts were less effective.

Ivbijaro and Balaji (1990) conducted field trials in Ibadan, Nigeria, to determine the effects of cypermethrin + dimethoate, the oil extract from ripe seeds of Piper guineense and the aqueous extract of ripe seeds of neem {A. indica) on the insect pests and yield of cowpea {V. unguiculata). The insecticides were applied at 30, 42 and 53 days after planting. Cypermethrin + dimethoate was consistently superior to all other treatments in substantially reducing the population densities of the thrips Megalurothrips sjostedti and the pyralid Maruca testulatis, which are serious pests on the floweres and buds, and in reducing the densities of 4 pod-sucking hemipterous insects (the coreids Clavigralla shadabi and Riptortus dentipes, and the pentatomids Aspavia armigera and Nezara vihdula). Pest population densities were also reduced by foliar sprays with neem or P. guineense extracts. Seed yield after treatment with cypermethrin + dimethoate was 0.99 t/ha, more than double the yield fi-om the other treatments. A marginal increase in seed yield compared with the untreated control was achieved by foliar spraying with A. indica extract.

Tanzubil and McCaffery (1990) observed that the treatment of larvae of

Spodoptera exempta with azadirachtin and aqueous neem seed extracts produced a

46 range of adverse effects. High doses of up to lO-micron g/larva of azadirachtin resulted in 100 percent lar\'al mortalit)', but this effect was delayed and prolonged.

Rovesti and Desco (1991) studied and tested the aqueous NSKEs against eggs and larvae of the apple pest Leucoptera malilfoliella in the laboratory, in consistent results were found for kernels from different origins. An extract from a batch of kernels at 20 g/lt gave a 60 percent reduction of eggs hatching rate, while no significant reduction was obtained when using kernels from another batch at 25 g/lt. In both experiments, the growth of hatched larvae was disrupted and no pupation occurred. A concentration as low as 1.25 g/It of the more effective kernels caused 80 percent larval mortality. Complete kill was obtained when 1^' to

3'^'' instar larvae were treated at 5 or 20 g/lt. Systemic activity was confirmed when the extract was applied to apple plants as a soil drench or sprayed on the lower leaves of the plants.

Sarode and Gabhane (1994) studied the performance of neem seed extract with reduced insecticidal dosage on the infestation of fruit borer. NSKE was evaluated along with reduced doses of 3 recommended insecticides (Endosulfan,

Monocrotophos and Malathion) against E. vittella on okra in Akola, Maharashtra.

India. Among 14 treatments, application of Endosulfan (0.06%) was the most effective, followed by NSKE (5%) + 3/4 dose of Endosulfan (0.045%),

Monocrotophos (0.05%). NSKE + 1/2 dose of Endosulfan (0.03%), and NSKE +

3/4 dose of Monocrotophos (0.037%) which recorded 14.83, 16.09, 18.13 and

18.16 percent fruit infestation, respectively.

47 Evaluation of neem formulations CTRI-I, CTRI-II, CTRI-III and DOR-I

from seeds of neem, all at 50 ppm AZT concentrations, and DOR-II from seeds of

Melia azedarach (1% extract) and 4 Pongamia formulatios prepared from seeds of

Pongamia pinnata. It is revealed that all neem formulations were significantly

more effective against S. litura on tobacco than Pongamia fonnulations. Contrary

to earlier findings, neem formulations from seeds of A. indica gave better

protection than from seeds of M azedarach.

Kevin et at. (1996) evaluated the bio efficacy of A. indica seed extracts for

the control of eastern spruce budworm defoliator damage. Foliar and systemic

applications of neem seed extract in a white spruce {Picea glauca (Moench Voss.),

seed extract effectively controlled defoliation by larvae of eastern spruce

budworm, Choristoneura fumiferana (Clem.) (Lepidoptera: Torticidae). Azatin EC was applied at vegetative budswell and vegetative budflush in 1995 using a backpack compressed air sprayer (75 ppm azadirachtin). Insect observation 4 weeks after treatment (4 branches/tree) was reduced to 82 percent and 81 percent at budswell and budflush, respectively. The incidence of shoot grazing (two 45 cm branches/tree) was reduced by 50 percent at both application times. At 60-ppm azadirachtin, the incidence of shoot damage was reduced to 43 percent (from 82 to

47%) and the proportion of grazed shoots severely damaged was reduced to 72 percent (from 74 to 21 %).

Suhas et aL (1996) tested the bio efficacy oi A. indica seed extract (NSE) on ber fruit borer, Meridarchis scyrodes Meyrick. The application of 5 percent

48 NSE was as toxic as fenvalerate, decamethrin (deltamethrin) and cypermethrin and cypermethrin in the control of M scyrodes.

Jaglan et al. (1997) evaluated methanol and chloroform: methanol (9:1) extracts of neem seeds and green leaves against H. armigera. The chloroform: methanol (9:1) neem seed and leaf extracts showed better insecticidal properties than methanol extracts.

Formulations- I: neem seed extract (NSE) - Kilograms of Thai neem seed were ground to powder by a grinding machine and put into the extracter tank. The powder was stirred in 100 It of 95 percent methanol for 4 hrs then left to stand overnight and then stirred again for 1 hour. The solution was filtered and concentrated by vacuum evaporation. After removal of neem oil in the upper layer of the crude product, neem solution was determined for AZT content by HPLC. It contained 0.514 percent AZT w/v.

Prashad et al. (1998) carried out the action of plant extracts against

Amsacta moorei. The rhyzome extract of Acorns calamus, bulb extract of Allium sativum and the seed extracts oi Azadirachta indica, Annona squamosa, Croton tiglium and Pongamia glabra, along with A. indica alone at its two concentrations of 1.5 and 3.0 percent were taken for this experiment.

Oil

Anonymous (1962) studied and tested the oils of seed trees, neem

(Azadirachta indica A. juss) china berry (Melia azedarach (L.), custard apple (A. squamosa), mahua (Madhuca longifolia koen) and karanj {Pongamia pinnata) are

49 wide spread in India and are sources of considerable quantities of non-edible oils.

Annual production of neem oil averages 83,000 tons (ketkar, 1976), while mahua

annually yields about 117.000 m. tones of oil seeds and A. indcia oil tested against

Callosobruchm chinensis Linn AH et al. (1983).

Jadhav and Jadhav (1984) studied the bio efficacy of rattan jyoti oil

{Jatropha cureas Linn.), neem oil {A. indica), undi oil (Callophyllum mophyllum

Linn.), mahua oil (M longifolia) and clove oil (Syzgium aromaticum Linn.)

against C. maculatm. They observed that rattan jyoti oil at 0.3 percent

concentration significantly checked the egg laying and also caused cent-percent mortality of eggs at all levels of rattan jyoti oil, undi oil at 0.2 and 0.3 percent. neem and mahua oils at 0.3 percent level.

Mariappan and Saxena (1984) carried out in IRRI, Philippines showed that oils extracts from seeds of custard apple {Annona squamosa Linn.) and neem

{A. indica) were highly effective in reducing the survival of Nephotettix virescens

(Distant) and its transmission of rice tungro virus. The potential of insecticidal action in custard apple and neem oil mixtures is of added value in the control of the vector, and tested Azadirachta indica A. Juss oil and Annona squamosa L. seed oil against Nephotettix virescence (Distant).

Pathak and Krishnan (1985 & 1986) tested the effect of A. indica seed oil, a capable ingredient, which was able to check rice moth (Corcyra cephalonica

St.) in terms of reducing the viability of eggs and also tested the reproductive

)0 efficacy of Eariasfabia stoll by using neem oil vapour, there was a great reduction

in the number of eggs laid by the female and their viability, while the other

activities of insect were relatively unaffected.

Singhamony et al. (1986) tested the oils of clove, cedas wood {Juniperus virgianiana L) and karanja (Pongamia glabra) at the dosages of 25-100 ppm provided protection to wheat against Sitophilus oryzae Linn, and Rhizopertha dominica (F.) up to 60 and 30 days respectively. Ail the tested oils gave cent- percent mortality of 5. oryzae after 15 days exposure.

Mariappan et al. (1988) carried out green house studies to determined the effectiveness of non-edible seed oils (karanj, mahua, neem and pinnai) on the survival ofN. virescens and their transmission of rice tungro virus. It is concluded that karanj, mahua and pinnai oils were more effective when compared to neem oil in reducing the survival of rice green hopper and its transmission to rice tungro virus.

Srivastava et al. (1988) evaluated the bio efficacy of essential oils of M. arvensis. Eucalyptus globulus Labill, Cymbopogan winterianus Jowitt and

Cymbopogan martini (Steud.) were tested against Callosobruchus chinensis Linn, on seeds of red gram, Cajanus cajan Linn. The 0.1 percent concentration of C martini oil was the most effective in preventing oviposition (18.66 eggs/adults 90 days after the release). It is concluded that essential oils of M arvensis and C martini at 0.2 percent, E. globulus and C. winterianus at 0.4 percent could be used against C. chinensis on C. cajan.

51 Singh et al. (1990) evaluated A. indica oil at various concentrations (1, 2, 3

and 4%) mixed with teepol (0.4%) against rice leaf folder {Cnaphalcrocis

medinalis Guenee) on PR 106 and stem borer (Scirpophaga incertulas Walker) on

Basmati 370, respectively. The other three treatments were teepol (0.4%),

Monocrotophos (0.05%) and untreated control. For stem borer, Monocrotophos

was the best treatment both in terms of reducing stem borer incidence (4.15% dead

hearts and 3.57% white heads) and increase in yield (2027 kg/ha). Neem oil (4%)

was at par with Monocrotophos in respect of stem borer incidence (5.26% dead

hearts and 5.99%) white heads) but inferior in yield (1792 kg/ha). The untreated

control recorded 7.18 percent dead hearts and 13.86 percent white heads with a

yield of 1523 kg/ha.

Samuthiravelu and David (1990) carried out the effectiveness of ^. indica oil (0.1, 0.2, 0.3.0.4 and o.5% alone) and incombination with deltamethrin (0.09%) on cotton under fiekd conditions in Tamilnadu, India, during 1986-87.

Deltamethrin was the most effective treatment for minimizing infestation Earias uittella (with a yield loss due to the pest of 121.33 kg/ ha). The next best trestments were neem oil (0.4 and 0.5%) or neem oil (0.5%)) with deltamethrin

(0.09%) (Which gave yield losses of 146.1, 143. 66 and 124.80 kg/ha. respectively).

Gupta et al. (1990) tested of efficacy and bioefficac\ to economics of certain insecticides i.e. Monocrotophos, Endosulfan, fenvalerate, decamethrin

(deltamethrin) and cypermethrin and plant oils of A. indica and P. pinnata against

52 H. armigera on chickpea {Cicer arietinum) in the field in Madhya Pradesh, India.

All treatments significantly reduced the larval population. The highest grain yield

was obtained with edndosulfan (0.07%), followed by Monocrotophos (0.04%).

Samuthirvelu and David (1991) evaluated the bioefficacy of/4. indica oil

and Endosulfan against the fruit borer, Earias uittella on okra. A. indica oil (at 0.1,

0.3 and 0.5%) was tested alone and with Endosulfan (0.035 and 0.07%) for the control of E.uttella in Tamil Nadu, India.Applications of neem and Endosulfan.

Alone and together, reduced damage and the maximum yield were obtained with ensosulfan (0.07%).

Salem (1991) evaluated of ^. indica seed oil (at 20, 40, 60, 80 and 100 ppm) as tuber protectant with sevin (carbaryl) lOD (at 1.0 kg/ton potatoes) against

Phthorimaea operculella Zell on potatoes stored covered with a rice hill in a store in Menoufiya, Egypt, in summer 1990.Storage losses after 6 months in potatoes treated with 100 ppm neem oil carbaryl were 25 and 10 percent, respectively. In laboratory experiments, 100 ppm neem oil and carbaryl caused 78.57 and 88.10 percent mortality of larvae, respectively, and both allowed only 10 percent successftil pupation. All adults emerging from pupae of larvae treated with 100- ppm neem oil were deformed.

Rohitha et ai (1991) studied and tested the activity of neem {A. indica), nutmeg (Myristica fragrans) and pine {Pinus radiate) oils against the tortricid

Epiphyas postvittana (light brown apple moth) using 0.01, 0.05, 0.25 and 6.25 percent aqueous emulsions incorporated into artificial diets. All 3 oils were toxic

53 to neonate larvae, with LC50S of 1.17, 1.47 and 0.44 percent for neem, nutmeg and

pine oils, respectively.

Jackai and Oyedivan (1991) tested the bio efficacy of neem (A. indica) oil

and different formulations of neem oil (with a hot water extract of Tetrapleura tetraptera fruits as an emulsifier) including neem oil emulsifiable concentrate

(NOEC), neem oil slurry EC (NOSEC) and NOEC (5%) (all obtained from the seeds of the neem plant) against the pyralid Maruca testulalis on cowpea in the laboratory. NOEC at 5, 10 and 20 percent exhibited a high degree of insecticidal activity to 3"* instrar larvae. All the treated flowers were protected from larval damage 2 days after treatment as compared with the 100 percent damage on untreated flowers and flowers treated with T. tetraptera extract alone. NOSEC and

NOEC (5%) also exhibited some insecticidal activity, which decreased with a decrease in concentration. NO and NOEC were superior to NOSEC.

Venkateswarlu et al. (1992) tested the bio efficacy oi A. indica oil alone and in combination with certain chemical insecticides on pod borer complex of black gram {Vigna mungo). Neem oil, alone and with either of 2 chemical insecticides, was tested in sprays against S. litura, Maruca testulalis and H. armigera on V. mungo in Andhra Pradesh, India. Neem oil (at 1%) in combination with Endosulfan (0.07%) was the most effective in reducing infestation and increasing yields.

Sharma and Bhatnagar (1993) evaluated the bio efficacy of non-edible oils on Chilo partellus in the laboratory. It was observed that the number of eggs

54 deposited by the female were less in number on n^eTn'and/kar^j oil-trealefl strips I , \cc. No. ,, I - jj as compared with castor and mahua oil. The surviyal of the larvae* \nl neem treatment at 2 percent after 24, 48 and 72 hrs, was 81.66, 78.33 ds^^^^6 percent, respectively; at 6 percent, it was 61.66, 30.00 and 16.66 percent: at 8 percent, it was 56.66, 26.66 and 11.66 percent and at 10 percent, it was 55.00, 23.23 and

11.66 percent, respectively. Thus, it was observed that higher the oil concentration, the lower was the larval survival.

Shukla et al. (1996) studied and tested the efficacy of some insecticides and plant products against E. vittella on oicra. Field experiments were conducted to determine the efficacy of neem oil, Achook, fenvalerate, cypermethrin, karanj oil, dichlorvos and Malathion for control of E. vittella infesting . Fenvalerate

(0.005%) gave the highest level of control and highest level of control and highest healthy fruit yield (70.75 q/ha) and was also highly cost-effectivewitha cost- benefit ratio of 1:10.3. There was no statistical difference between crop yields following treatment with cypermethrin (0.005%), Malathion (0.05%)), Achook

(1%) and neem oil (!%>) sprays, which produced 69.46, 64.43, 64.37 and 64.04 q/ha healthy fruits, respectively.

Akhauri et al. (1996) observed the toxicity in the experiment of insecticide for the management of spotted pod borer, Maruca testulalis Geyer in pigeonpea.

Field trials were done in RBD with early grown pigeonpea cv. UAAS-120 to compare the effectiveness of two indigenous plant products. It was observed that both A. indica oil and mahua oil (each at 2%) as spray were able to reduce the

55 larval population. However. A. indica oil proved better than mahua oil spray in significantly reducing the mean pod damage (27.2 to 18.9%) while increasing the mean number of matured pods (67.4 to 85.8/plant) and grain yield (13.5 to 17.4 g/plant) in comparison to untreated check. A. indica oil, therefore, might be exploited more efficiently as a biorational insecticide in pod borer management in early pigeonpea cultivation.

All Niazee et al, (1997) observed the toxicity of ^4. indica and insecticides both in laboratory and field against Archips rosanus. Margosan-0 (0.3% AZT) was tested in Oregon against the tortricid A. rosanus. In laboratory tests, a 1 percent aqueous solution of neem insecticide produced 100 percent larval mortality within 48 hrs of treatment. At lower concentrations of 0.1 and 0.01 percent, 48-hr mortality rates were reduced. Prolonged deleterious effects of sublethal treatments of neem were observed even at the lowest concentration

(0.001%) tested. Mortality in the 0.1 and 0.01 percent treatment groups reached

100 percent within 32-39 days after treatment. Field data showed that 3 weeks after application, 1 percent Margosan-0 was as effective as the organophosphate insecticide diazinon, and significantly more effective than the microbial insecticide Dipel {).

Rao and Dhingra (1997) studied the synergistic activity of some vegetable oils when mixed with cypermethrin against different instars of S. litura. The non­ toxic vegetable oils, karanj oil (P. pinnata), neem oil {A. indica), citronella oil and pipeeronyl butoxide (PBO) were separately used in mixed formulations with

56 cypermethrin at various ratios (1:1, 1:2, 1:5, 1:10) and evaluated against 1, 4, 7

and 9 day-old larvae of S. litura by leaf dip and direct spray methods. With the

direct spray method, the synergistic activity of neem oil in the formulation was pronounced against 4 and 9 day-old larvae. Also, karanj oil exhibited synergism against 1, 7 and 9 day-old larvae. However, citronella oil showed synergistic activity only against 7 day-old larvae.

A. indica as biopesticides

Antifeedant Activity

Koshiya and Ghelani (1990) observed the antifeedant activity of deterreni plant derivatives against S. litura on groundnut crop. All the plant materials, either leaves or seeds, was ground individually in grinder. The powder was mixed with acetone and kept for 24 hrs. The mixture was filtered through Buckner funnel. The acetone extracts were diluted to 5, 10 and 15 percent concentrations in soap water.

The leaf discs were sprayed with the extracts and after drying under fan. transferred in to plastic tube. The larvae were allowed to feed on the treated discs for 12 hrs. The observations revealed that percent feeding was decreased with increased in the concentrations of antifeedant. The increased dose offered better protection to groundnut leaves against this pest. All the seven plant extracts of 5 percent concentration proved significantly superior to untreated control in providing protection against the 3"^ -instar larvae. At 10 percent concentration of the leaf and seed extracts of neem were equally effective and gave 67.5 percent and 78.85 percent protection of groundnut leaves, respectively. It was also

57 observed that the neem extracts did not differ significantly form karanj seed

extract.

Jeyarajan et al. (1990) evaluated the bio efficacy of 7 azadirachtin rich

fractions namely Nemol, Ne-pet-et, NS58/GSN.OU, Vemidin, NKIOO, Nem 75

and Nemidin for their antifeedant and growth retardant properties. Each fraction was dissolved in acetone and made up with water for required concentration. The

leaves of castor were sprayed with the extracts and then after drying, placed in a tube with 5^ instar larvae. The observations revealed that in Ne-pet-et, the area fed and weight of faecal pellets produced were 793.00 mm2 and 518.33 mg, respectively and it was significantly lower than other treatments. Other treatments, which were next in order, were NKIOO, NS58/GSN/OU and Nemidin in which

65.88, 59.33 and 56.74 percent reduction in feeding was observed, respectively.

Blaney et aL (1990) observed the antifeedant activity of azadirachtin derivatives and related limonoids in choice and no-choice bioassays against 24 to

36-h-hold final-instar larvae of the noctuids Spodoptera littoralis, S. frugiperda,

Heliothis verescens and Helicoverpa armigera in the laboratory. The choice bioassay showed that the feeding behaviour of 5. littoralis was affected by more of the compounds than that of either S. frugiperda or H. virescens, with H. armigera being the least affected. Azadirachtin and dithydroazadirachtin were the most potent of the 40 compounds tested. Hydrogenation of the C-22, 23 double bond did not decrease antifeedant activity and the nature of the substitutes at C-1, C-3 and C-11 were important. Molecules with bulky substitutes at either C-22 or C-23

58 were usually ineffective antifeedants as were compounds lacking an epoxide.

Compounds recorded as active antifeedants in the choice bioassay were not always

as active in the no-choice test.

Isman et al. (1991) reviewed the research aimed at developing a neem {A.

indica) based insecticide for use in Canada. The potent antifeedant action of azadirachtin in laboratory bioassays against the pyralid Ostrinia nubilalis and the noctuid Peridroma saucia and its moult-disrupting action against the acridid

Melanoplus sanguinipes and the lygaeid Oncopeltns fasciatus are documented.

Both the antifeedant and insect growth regulatory activities of various samples of neem seed oil were correlated with azadirachtin concentration.

Dubey et al. (1991) evaluated antifeeding properties of indigenous medicinal plants against Helicoverpa armigera. Nine plant extracts were compared with 2 chemical insecticides in sprays against the noctuid H. armigera on chickpeas in Madhya Pradesh, India. Among the plant extracts, neem seed kernel extract and neem rind extract, due to their antifeedant action, provided maximum protection resulting in higher yields. Monocrotophos (0.04%) and a mixture of 5 percent BHC (HCH) with 5 percent DDT dust at 25 kg/ha were also effective.

Sharma et aL (1992) tested the bio efficacy of plant substances as antifeedant against insect pests of jute (). Three insect pests of jute viz. the stem weevil (Apion corchori), the semilooper ( sabulifera) and the Bihar hairy caterpillar {Spilosoma obliqua) were highly destructive pests

59 of jute in Bihar. Laboratory reared 3'^'*-instar larvae of tlie last 2 of these pests were

used in laboratory for antifeedant tests of crude aqueous extracts of leaves of neem

(A. indica), lantana {Lantana camara), sanhund {Euphorbia royleana) and harsingar {Nyctanthes arbortrytis [arbortrytis]), and of whole plants of chirata

{Swertia chirata). Jute leaves dipped in the extracts were fed to the larvae. All the extracts showed antifeedant activity, the most effective being those of chirata and sanhund, followed by neem, lantana and harsingar. Except for chirata, extracts at the higher concentration of 100 percent were more effective than 50 percent extracts.

Jayarajan et al. (1993) observed the antifeedant and morphogenetic effects of azadirachtin against S. litura. Studies on the effects of azadirachtin-rich fractions on larvae of S. litura revealed that Ne-pet-et has strong antifeedant properties. Larval mortality due to malformation was observed with vemidin,

NEM-75 and Nemidin, and adult malformation with ne-pet-et and Nemidin treatments.

Koshiya and Ghelani (1993) determined the antifeedant activity of various plant extracts against S'^'-instar larvae of 5. litura on groundnut leaves in the laboratory at 26^C. Neem leaf and seed extracts and extracts of seeds of pongamia pinnata ware highly effective, giving 75.5, 88.96 and 66.4 percent protection, respectively at 15 percent concentration.

Durairaj and Venugopal (1994) studied the antifeedant effect of A. indica products aginst S. litura. Neem products viz. Neem Azal F (0.00125-0.01%),

60 Neemark (1%), neem oil (3%) were tested against S. litura on fresh cotton leaves

in laborator)'. Five pre-starved 3'^'' instar larvae were introduced in petridish

containing treated leave. After 48 hrs, the leaf area fed was measured. The result

indicates that the lowest leaf area fed (8.6 cm^) and minimum faecal pellet weight

(29.9 mg) were recoreded in NeemAzal F at 0.01 percent indicating the maximum

antifeedant activity while in control the leaf area fed was 29.5 cm with maximum

faecal pellet weight (210.6 mg). In neem oil (3%), the fed area was 14.8 cm^ with

faecal pellet weight 45.9 mg. In case of Neemark (1%), the area fed was 12.7 cm with a feacal pellet weight 58.0 mg. In the artificial medium after 24 hrs, the

lowest faecal pellet weight (14.5 mg) was recorded in NeemAzal F (0.01%) indicating maximum antifeedant effect.

Kumar et al. (1997) observed the antifeedant and growth inhibiting effects of neem leaf exudates on S. litura. Young reddish neem leaves were collected and soaked in cold acetone. Various concentrations viz. 1.0, 2.5, 5.0 and 10.0 percent were taken for the study. Antifeedant activity of leaf exudate was assayed b\' using leaf disc no-choice test. The larval mortality was recorded at different concentrations after 48 hrs. The exudate caused tremendous antifeedancy, ovipositional deterrency and larval mortality in S. litura in a dose-dependent manner. At 10 percent, treatment pronounced antifeedancy (94.7%), ovipositional deterrency (91.5%) and mortality (87.9%) were observed. Extended lar\al and pupal durations and decreased oviposition period, adult longevity and fecundity were evident in S. litura after the treatment.

61 Aerts and Mordue (1997) studied feeding deterrency and toxicity of A.

indica triterpenoids against several pests. The biosynthesis of azadirachtin starts

with a steroid precursor and proceeds via two levels of structural complexity, i.e.,

furan ring formation and C-ring opening, after which further modifications yield

azadirachtin. Antifeedant and toxic properties of azadirachtin against insects were

compared with those of various compounds from the two lower levels of structural

complexity. To larvae of Spodoptera litteralis, several compounds from the lower

structural levels showed strong antifeedant activity, comparable to that of

azadirachtin. Nymphs of Schistocerca gregaria in antifeedant tests were more

sensitive to azadirachtin than to the other compounds tested.

Katti and Saxena (1997) observed the toxicity of some A. indica

formulations for antifeedant effect against semilooper, Autographa nigrisigna

Walker in chickpea. The products used were Repelin (1%), Neemguard (2%),

neem EC (0.15%), neem 25 WDP (0.15%) and neem oil (0.6%). The antifeedant

effect was worked out based on percentage pod feeding. The results presented

revealed that all the neem treatments showed significant antifeedant effect in

comparision to control, after 24 hrs of feeding by A. nigrisigna. Repelin,

neemguard and neem EC treatments showed nil percent and pod feeding and were

superior to neem WDP (13.3%) and neem oil (15.0%) treatments, which were on par with each other. The control treatment showed 21.7 percent feeding by A. nigrisigna. After 48 hrs of feeding by A. nigrisigna in repelin treatment while neemguard and neem EC treatments showed 1.7 and 3.3 percent pod feeding,

62 respectively. These treatments were however on par with one another and superior

to neem WDP and neem oil treatments which did not show any further increase in

pod feeding by A. nigrisigna.

Datta and Saxena (1998) compared the antifeedant acitvity of

azadirachtin-A and parthenin against S. litura by short-term dual choice and no-

choice tests. Concentration dependent antifeedancy was noticed only in dual

choice tests. Azadirachtin-A was considerably more effective than parthenin in causing antifeedancy.

Ocete et al. (1998) tested the antifeedant effects of A. indica extracts against baetica Ramb. The antifeedant activity of doses of 14.33

Hg/cm^ and 7.16 jig/cm^ of an extract of neem were evaluated against larvae of the

4'*'-instar of O. baetica using leaf discs of Beta vulgaris as food. Results showed that there was a statistically significant difference between the average consumption of dry weight of food/larva in the case of the disks treated with the higher dose compared with the control.

Rathore and Yadava (1998) studied non-preference of different plant extracts against the Bihar hairy caterpillar, Diacrisia oblique Walker, a serious pest of pulses crops in India. Late stage larvae are voracious feeders and difficult to control with insecticides. To study the non-feeding preference, the leaf extracts of neem {A. indica), Kaner (Thevesia nerifolia) and bulbs of garlic {Allium sativus) were tested against 4 instar larvae. The respective plant parts were ground in a mixie without adding water and filtered. This was considered as 100 percent

63 solution. The filtrate was used in 100, 1, 0.5 and 0.25 percent concentrations. The

castor leaves treated with above concentrations were provided to the larvae to feed

for 4 hrs at the rate of 3 larvae/petridish of 10 cm and replicated thrice. The test

larvae were starved for 1.5 hrs before release for feeding. The leaf area in each

treatment was measured before and after the experiment with the help of leaf area

eaten was determined.

Jhala et al. (1998) studied the antifeedant and larvicidal efficacy of plant

extracts viz. ardusa {Allanthus excelsa Roxburgh) leaves extract (AALE), ardusia

{Adhatoda asica L.) leaves extract (AILE), castor (Ricinus communis L.) leaves

extract (CLE), castor seed extract (CSE), damra (Ocimum acilicum L.) leaves

extract (DLEO), pudina {Mentha piperita L.) leaves extract (FLE), naffatiya

(Ipomea cornea L.) leaves extract (NFLE), neem {A. indica) leaf extract (NLE),

neem kernel extract (NKE) and tulsi {Ocimum sanctum L.) leaf extract (TLE) in

the laboratory against cotton leaf roller, Sylepta derogate Fabricius. Based on

percent reduction in leaf area consumption over control after three days of feeding

by the larvae, the order of these plant extracts for their antifeedant efficacy was :

NLE (86.45%) > NKE (82.72%) > NFLE (63.87%) > CLE (59.50%) > CSE

(58.78%) > AALE (57.35%) > DLE (54.05%) > TLE (52.54%) > AILE (51.97%)

> FLE (29.10%). While the order of these botanicals based on percent larval

mortality after 4 days of feeding by the larvae on treated leaves was : NKE

(66.71%) > NLE (43.28%) > AALE (39.96%) > DLE = CLE (33.23%) > FLE

(29.97%) > NFLE (23.15%) > CSE (19.98%) > AILE = TLE (13.00%).

64 Babu (1998) observed the combined activity of A. indica and chinaberry extracts on feeding and oviposition of 5. litura Fab. Antifeedant activity of NSKE, neem bark extract (NBE), chinaberry seed kernel extract (CSKE) and chinaberry bark extract (CBE) were assayed using a leaf disc choice test. The index of feeding deterrency was calculated as (C-T)/(C+T) x 100, where C is the consumption of control discs and T is the consumption of treated leaf discs.

Sahayraj (1998) observed the antifeedant effect of some plant extracts on the Asian armyworm, Spodoptera litura, a pest in groundnuts. Plant extract of neem {A. indica), oranges {Citrus sinensis), Vitex nigundo and ginger (Zingiber officinale) were evaluated for their antifeedant and growth inhibitory activities against last instar larvae of S. litura. For evaluation of antifeedant effects of botanicals of food consumption and assimilation in the laboratory, groundnut shoots were dipped in different extracts for 15 mts. The final instar larvae were found in all plant extracts. The strongest deterrent effect was found in V. negundo and was indicated by very low food consumption and digestibility, faecal pellets production, and reduced body weight. The percentage of deformity in pupal as well as adult stages was the highest in Z officinale, followed by A. indica and C. sinensis. All plant extracts showed antifeedant action and growth inhibiton.

On a clear sunny day, castor leaves on plants itself were treated with different concentrations of crude neem oil (1,3,5%) in morning hours. These treated leaves were plucked at different intervals after exposure to varied degree of sunlight (0,3,6 hrs). The intensity of sunlight was recorded regularly at half hourly

65 intervals. These treated leaves were fed to freshly moulted 3'^''"instar larvae of H. armigera for 48 hrs and thereafter fed with untreated castor leaves for 48-96 hrs.

The leaf area of treated and untreated leaves before and after feeding was recorded with leaf area meter (LI-COR; LI-3000). Results show that the antifeedant effect of neem oil (1,3 and 3,5%) against test insect were at par (20.92, 18.03 and 18.03,

16.21 cm leaf area/larva, resp.). However, 13.70, 18.15 and 23.31 cm leaf area was consumed by larva when neem oil was exposed to sunlight for 0, 3 and 6 hrs, respectively. The antifeedant effect of all the concentrations of neem oil at 0 hr exposure to sunlight were at par (14.83, 12.40 and 13.87 cm^ leaf area/larva), where as the effect of neem oil was reduced significantly after 3 and 6 hrs exposure to average sunlight intensity of 63,983 and 64,758 lux, respectively. No significant difference was observed in feeding efficiency of test insect on untreated castor leaves. It has been also observed that the test insect consumed larger area when fed on untreated leaves (av. 31.82 cm^) during post exposure period than that of treated leaves (av. 18.38 cm ). It shows that sunlight plays a crucial role and affects the stability of neem oil which intum reduced its antifeedant effect against the test insect, H. armigera.

Repellent Activity

Devaraj and Srilatha (1990) observed the antifeedant and repellent properties of certain plant extracts against Corcyra cephalonica St. The antifeedant, repellency activities of neem, mustard, datura. Eucalyptus and lemongrass was investigated. The tests were made on 3'^'' instar larvae of C.

66 cephalonica with 4 replication. The observations revealed that among all extracts, neem was found to be the best antifeedant against the test larvae as indicated by less number of holes on the treated paper, at 3.5 percent concentration at which the mean number of holes were 1.25, 3.5, 5.50, 6.75 at intervals of 24, 48, 72, 96 hrs, respectively. Datura was least effective antifeedant amongall products tested. It was also observed that Eucalyptus was the most effective, giving 100 percent repellency against the test insect after 10 mts of treatment at the highest concentration followed by lemongrass, mustard, neem and datura. At lower concentrations (0.5, 1.0 and 1.5%), the percent repellency falls. The observations after 1 hr showed decreased percent repellency at different concentrations.

Devraj and Srilatha (1993) determined the antifeedant and repellent properties of extracts of neem, mustard, Datura, Eucalyptus and lemon grass

{Cymbopogan sp.) against the pyralid Corcyra cephalonica. Neem extract had the greatest antifeedant activity followed by Eucalyptus, lemon grass, mustard and

Datura extracts, respectively. Eucalyptus extract was the most repellent, followed by lemon grass, mustard, neem and Datura extracts.

Desai and Parikh (1996) observed the efficacy of neem-oil based formulation (Nimbitor) showed excellent bio-effectiveness against insect pests of okra, brinjal (fruit and shoot borers), chickpea (pod borer), rice pest complex and cottion pest complex at concentration of 1-2 percent spray by reducing the crop damage and protecting the shoot, fruit, leaves, grains and cotton boll. Nimbitor helped to obtain increased yields and healthy produce. Nimbitor is compitable

67 with synthetic insecticides and showed synergistic effect when used in

combination. Laboratory studies have shown that Nimbitor has very good

repellent activity against Helicoverpa armigera on castor leaves and Spilosoma

obliqua on sunflower leaves.

Singh et al. (1996) studied and tested an aqueous extracts of A. indica seed

kernel at 0.5 percent for the control of , a pest of the medicinal

tree Aegle marmelos in Kamataka, India. Spraying seedlings twice with an

interval of 8 days was effective in providing protection against the pest. Although

low mortality (23.3%) was reported, the extract had strong antifeedant and

repellent effects and was effective as a moulting inhibitor.

Alrubeai et ai (1997) tested the efficacy of some plant extracts and

chemical insecticides on Phyllocnistis citrella. Spraying citrus plants with neem

{A. indica) extracts or Sibahbah seed powder repelled P. citrella adults. The

insecticidal effect on larvae was 16 percent for neem and 90 percent for Sibahbah.

Detterent Activity:

Osman and Port (1990) carried out the systemic action of A. indica seed

substances against Pieris brassicae. The ability of neem seed powder and aqueous preparations applied to the soil to protect cabbage plants from damage by larvae of

P. brassicae was tested. In a no-choice test, treatment with neem seed powder at

20, 40 or 80 g/kg soil resulted in a siginificant reduction in damage compared with untreated plants. Similarly, in choice tests, plants treated with 1.5, 3 or 6 g neem

68 powder/kg soil or with 2.5, 5 or 10 percent neem aqueous solution were less

damaged than untreated plants.

Sehgal and Ujagir (1990) compared the efficacy of synthetic pyrethroids,

neem extracts and other insecticides against Helicoverpa armigera Hubner. The

chickpea {Cicer arietimum) crop at Pantnagar in Uttar Pradesh, India, consistenly

suffers extensive pod damage due to H. armigera varying from 42.6 to 90.0

percent, with an average of 65.5 percent in unprotected fields. Grain yields were

0.02-1.36 t/ha, average 0.7 t/ha, during the 'rabi' winter seasons of 1986-87.

Among the insecticides tested for 2 or more years, cypermethrin at 36 and 45 g, deltamethrin at 12g, fenvalerate at 120g, Endosulfan at 420g and Monocrotophos at 24 g/ha significantly and consistently reduced pod damage to <22.5 percent, giving grain yields of > 1.7 t/ha. Less effective but still significantly better than the control were quinalphos at 300 g, HCH at 2600 g and chlorpyrifos at 240 g/ha, and neem seed kernel extract at 5 percent. Mean grain yields were significantly negatively correlated with percentage pod damage.

Bandara and Kudagamage (1991) tested in the laboratory and field trials on cabbage in 1989 in Sri Lanka that neem oil, chlorfluazuron and triflumuron were promising against Lepidoptera when Plutella xylostella and Plusia iChrysodexis) eriosoma predominated.

Rovesti and Deseo (1991) noted that the aqueous NSKEs against eggs and larvae of the apple pest Leucoptera malifoliella in the laboratory, inconsistent

69 results were found for kernels from different origins. An extract from a batch of kernels at 20 g/lt gave a 60 percent reduction of egg hatching rate, while no significant reduction was obtained when using kernels from another batch at 25 g/lt. In both experiments, the growth of hatched larvae was disrupted and no pupation occurred. A concentration as low as 1.25 g/lt of the more effective kernels caused 80 percent larval mortality. Complete kill was obtained when 1^' to

3'^'' instar larvae were treated at 5 or 20 e/lt. systemic activity was confirmed when the extract was applied to apple plants as a soil drench or sprayed on the lower leaves of the plants.

Salem (1991) observed the A. indica seed oil and insecticide treatment programmes (chlorpyrifos + diflubenzuron (DC 702), cypermethrin (ploytrin), primicid (pirimiphos-ethyl) + IKI (chlorfluazuron) (Teper) and profenofos

(kurakuron) in 1989, pirimiphos-ethyl + chlorfluazuron, profenofos, thiodicarb

(Larvin) and fenvalerate (Sumicidin) in 1990 in field trials against Pectinophora gossypiella and Earias insulana on cotton. Yields following treatment with 4 sprays of 150 ppm neem oil and insecticides were 8.5 ± 0.61 and 7.7 ± 0.63

Kentar, respectively, in 1989 and 6.29 ± 0.53 and 5.83 ± 0.29 kentar, respecti\ ely, in 1990.

Hossain et al. (1994) evaluated the effectiveness of various indigenous materials and insecticides for their potential to control Phthorimaea operculella in storage. The study consisted of 12 treatments utilizing various indigenous

70 materials including dry sand, ash, rice bran, sawdust, rice straw. Eucalyptus,

lantana, neem, water pepper, 2 chemicals and a control. All treatments except rice

straw were effective in controlling the pest in storage for one month. After two

months storage, the infestation of potato tubers by the pest was 100 percent in the

control while in treatments with ash, rice bran and neem, it was zero to negligible.

After 3 months storage, no infestation was observed in rice bran-treated potatoes

and this was consistent with neem-treated potatoes, although the latter had greater

infestation.

Gerard and Ruf (1995) studied the neem extracts on the survival and

feeding of larvae of four keratinophagous insects. Six concentrations of a neem {A.

indicd) seed extract ranging fi-om 0.1-2.6 mg azadirachtin/g woollen cloth were

tested against late-instar larvae of Anthrenocerus australis, Tineola bisselliella.

Tinea dubiella and Hofmannophila pseudospretella. Feeding damage decreased

with increasing rates for all species. A significant rate response was found for T.

bisselliella and T. dubiella larval survival after 2 weeks, but there was no effect on

A. australis and H. pseudospretella, apart from a rate response in larval moulting in the latter. When the bioassay was repeated using the l^'-instar of H. pseudospretella, survival increased with increasing rates of azadirachtin.

Sombatsiri (1996) observed the toxicity of Thai neem seed extracts {A. indica var. siamensis) for the control of insect pests on Chinese kale, namely

Plutella xylostella, Spodoptera litura, and Hellula undalis. The experiment was

71 carried out on Chinese kale field in randomized complete block design with five

treatments and three replications. Various neem fomiulations were sprayed on the

plots right on the 10'*' day after sowing and continued once every five days until

seven days before harvest. It was observed from the data that all neem extracts

5%, MNSE, 0.25 and 0.5% MNPE could control P. xylostella, S. litura and H.

undalis larvae in low level. Methanol extract showed better control of H. undalis

larvae than Bacillus thuringiensis and insecticide. The neem extracts appeared to

have withstood P. xylostella and S. litura and even showed better resistance to H.

undalis. Methanolic neem extract at 5 percent concentration probably was the best

among the neem formulations in controlling insects and resulted in greater

marketable yield.

• L.

Bomford and Isman (1996) evaluated the desensitization of 5 instar

larvae of S. litura to azadirachtin and neem. The deterrence of azadirachtin, in its

pure from and as a consitituent of neem seed extract, to 5'*' instar of oest was

measured using cabbage (JBrassica oleracea var. capitata) leaf disc assays. Paired

choice assays, in which larvae could choose between feeding on a treated (1.3 \ig

azadirachtin/cm^ leaf area) or an untreated leaf disc for 2 hrs. were conducted at 24 hrs intervals throughout the 5* instar. In addition, no-choice assays, in which

larvae could feed on only one leaf disc (10 ^g azadirachtin/cm leaf area) for 1.5 hrs. were conducted consecutively over a 6 hrs period at the beginning of the 5"" instar. After repeated exposures, larvae became desensitized to pure azadirachtin in both choice and no-choice tests, but did not desensitize to neem containing the 72 same absolute amount of azadirachtin in choice tests. Hunger was responsible for

approximately one-third of the desensitization response in the no-choice tests.

Sensitivity to azadirachtin was independent of age within the 5^ instar.

Kumar and Babu (1998) observed the ovipositional deterrent effects of

two commercial neem formulations, NeemAzal T/S (1% azadirachtin) and Neem

Azal F (5% azadirachtin) against Leucinodes orbonalis showed that Neem Azal F

@ 1 ml/It to be the most effective treatment. Repellency was found to be dose

dependent. Investigations on their ovicidal effects against the eggs of L. orbonalis

and Henosepilachna vigintioctopunctata (Epilachna vigintioctopunctata) in

comparison to Endosulfan, revealed the superiority of Endosulfan in both cases.

Bajpai and Sehgal (1998) evaluated the ovipositional deterrent effects of

neem, karanj and tobacco formulations against the female of H. armigera.

The chickpea plants treated with NSKE (chloroform extract, 0.15 and 0.2%;

methanol extract, 0.1 to 0.2%; water extract, 7 and 8%); neem oil (6%) and

nicotine sulphate (0.3 to 0.4%) strongly inhibited the oviposition as females laid

significantly less number of eggs on treated plants compared to untreated plants.

The commercial neem products. Green mark, neem guard and Achook from 0.1 to

0.8 percent and karanj oil 0.5 to 6 percent could not deter the female moths

effectively.

Patel and Patel (1998) observed the oviposition deterrent effect of botanical material on tobacco leaf eating caterpillar, S. litura. Pot plants of Ricinus communis were

73 sprayed with leaf extracts (2 and 4%) of neem {A. indica), Ailanthus excelsa and Nerium indicum, and NSKE (2 and 4%) to investigate its deterring effects on oviposition of S. litura. All the plant extracts proved effective in reducing the oviposition by S. litura.

However, among all Grovmim (0.2 and 0.4%) proved highly deterrent to oviposition,

Neemark (2%) and seed kernel suspension of neem (4%) also proved equally effective as

Grownim but higher than the rest of the botanicals. Suspensions of neem leaf extract, leaves extract of yellow flower and leaves extract of Obandor ardusa proved equally deterrent to its oviposition. Suspension of neem seed kernel (2%) was found more effective than O. ardusa leaves (2%). It was also observed that all the concentrations at lower (2%) and higher (4%) remained equally ineffective.

IGR Activity

Mango et al. (1976) reported that ingestion of fern by insects induced extra moulting. Formation of deformed adults was also observed, when as 0.2 ug of extract per gm body weight was given. Brown and Llewellyn (1985) reported that the reproductive capacity was reduced in aphids, when fed on ferns. Later, Ravina and Gureeva (1985) reported that out of nine fern species tested, the ecolysterone content was highestin Diplazium sibiricum (0.3%) during early growth.

Tanzubil and Mc-Caffery (1990) evaluated the bio efficacy of azadirachtin on feeding and reproduction in Spodoptera exempta, an African armyworm. The effects of azadirachtin on the nutritional and reproductive physiology of the noctuid were studied in the laboratory. Azadirachtin (at 0.01, 0.1 and 1.0 ng/larva) retarded oocyte development and maturation in females obtained

74 from treated final-instar larvae. Decreases in fecundity also resulted from

treatment but were not accompanied by corresponding decreases in fertility.

Topical treatment of larvae with azadirachtin reduced food intake and the efficiency of utilization of ingested and digested food. Growth rate was impaired, especially at doses > 1 ^g/larva.

Isman et al. (1990) determined the variation in azadirachtin content of 12 commercially obtained samples of neem oil in the laboratory using liquid chromatography. The oils were bioassayed for larval growth inhibition

(incorporated in an artificial diet) and antifeedant activity against 5^ instar larvae of the noctuid Peridroma saucia. Moulting disrupting activity by topical application was assessed asainst newlv moulted 5^ instar larvae of the Iveaeid

Oncopeltus fasciatus. Among the 12 neem oil samples tested, the azadirachtin concentrations ranged from <50 to over 4000 ppm. The bioactivity of the oils, as measured by the EC 50, was correlated with the azadirachtin concentration for growth inhibition (r = -0.92), antifeedant activity (r = -0.85) and moulting disrupting activity (r = -0.95) between 72 and 90 percent of the variation in bioactivity of the oils was accounted for by the variation in the azadirachtin content. It is therefore concluded that the determiniation of azadirachtin content. It is therefore concluded that the determination of azadirachtin concentration may be a useful quality control criterion for neem oil as a precursor for insecticide production.

75 Ahmad and Bhattacharya (1991) observed the growth inhibitory effect of

some plants for Spilosoma obliqua Walker. The leaves of neem {A. indica), fern

{Dipalazium esculantum), Parthenium (Parthenium hysterophorus), bougainvillea

(Bougainvillea spectibilis), ocimum {Qcimum sanctum) and sweet neem {Murraya

koenigii) were dried in sun and again in oven at 45^C for 72 hrs. To obtain extract

50 g leaf powder was placed in conical flask and petroleum ether was added until

leaf material was dipped completely. The flask was shaken several times and stock

solution was prepared by filtration process. The decorticated bengal gram diet was

used for testing the growth inhibitory effect of 6 plant leaves. An attempt was

made to replace some proportion of basic commodity with cellulose. The larvae

survival recorded at two days interval indicated no adverse effect due to addition

of cellulose in the basic diet. It was observed that by adding 25 percent cellulose,

slight larval period prolongation takes place while in 50 percent addition of

cellulose, the larval period prolongation increased further. It was also observed

that addition of 25 percent equivalent neem showed a gradual decrease in the

population and 22 days after feeding, none of the larvae could survive to complete

the development. If 50 g of leaf powder was added, the complete larval mortality

was recorded in 12 days. Almost same trend was reported on other plant leaf

powders. Sweet neem is generally observed avoiding S. obliqua when leaf powder

of sweet neem was added to diet, it was observed that 86.7 and 80.0 percent larvae

could not survive on 26^^ and 28*^ day after feeding. It was found that greater reduction in larval survival was seen in diet compounded with neem extracts of

76 ethyl acetate (25 of 50%) on this diet complete larval mortality was recorded on 8

days after feeding with ethyl alcohol extract, a gradual decrease in larval survival

was noticed on 8 days. The petroleum ether extract and hot water extract gave

larval growth upto 16 and 18 days after feeding, respectively. On these diets, the

larvae remained small. Several reports available to show that bitter principles are

present in A. indica but only triterpenoids are responsible for phagodeterrancy and

growth regulatory activity.

Ayyanger and Rao (1991) studied the effect of azadirachtin on

development and reproduction of Spodoptera litura. The injection of neem extract

at 1 f^g body weight to 6'*' instar larvae of the noctuid S. litura reduced fecundity,

hatchability, pupation and adult emergence by 39.51, 53.11, 46.62 and 41.92

percent, respectively.

Sojitra and Patel (1992) studied and tested the effect of plant extracts on

ovipositional behaviour of spotted bollworm (Earias vittella) infesting okra

{Abelmoschiis esculentus). The experiment was conducted in complete

randomized block design with three treatments. There were 15 treatments. The

result indicates that Repelin (1%) and Neemark (0.1%) significantly reduced the

oviposition by E. vitella compared with all other treatments. It is also observed

that the plant sprayed with 5 percent paste suspension of neem seed kernel had

significant low egg laying than 5 percent leaf extract of neem, peppermint, sacred basil and ardusa.

77 Loke et al. (1992) studied the occurrence, distribution and fruiting cycle of

neem {A. indicd) in Malaysia. The contact toxicity of neem oil (1.25, 2.5, 5.0, 10.0 and 40.0%) was evaluated against 2"'' and 3"^ instar larvae of P. xylostella.

Significant mortality of larvae of both instars was observed at 10 percent concentration. Physiological and growth disruptive effects such as growth retardation, delayed adult emergence and abnormal adults were observed with sublethal concentration. Pupae were not affected by treatment with neem oil at

1.25, 2.5, 5.0 and 10 percent. However, adults males and females treated with 2.5 percent and higher concentrations of neem oil had significantly higher mortalities than untreated adults. Using a leaf disc technique, it was shown that concentration of neem oil at 1.25 percent deterred feeding of larvae of P. xylostella. Neem oil at

>1.25 percent significantly reduced egg hatch and at 20 percent, all treated eggs failed to hatch.

Sinha (1993) observed the field efficacy of ^4. indica products and insect growth regulators against Helicoverpa armigera Hubner. Diflubenzuron, neem {A. indica) oil and neem seed kernel extract were tested for control of H. armigera infesting chickpea in kamal, Haryana, India. Diflubenzuron (0.05%), neem oil and kernel extract (5%) sprayed at an interval of 10 days gave a 2-fold reduction in infestation compared with the untreated control. Increase in seed yield was 39 and

47 percent with diflubenzuron and Endosulfim, respectively. During the 1989-90 and 1990-91 season, some new neem products and chitin biosynthesis inhibitors were evaluated along with Endosulfan. A large infestation was recorded (12.5% in

78 1989 and 37% in 1990-91). Flufenoxuron (0.0125 or 0.025%) reduced infestation by 45-50 percent and 77-78 percent in the 1989-90 and 1990-91 seasons, respectively. Neem emulsion and neem wettable powder gave 40-60 percent control. Neem kernel extract at 5.0 percent gave 40 percent reduction in infestation and was comparable to Endosulfan at 0.07 percent. However, Neemguard was ineffective. There were no significant differences in the seed yield in plots treated with neem emulsion (0.125%), neem kernel extract (5%), flufenoxuron, and

Endosulfan.

Osman (1993) noted that methanol extracts of neem (A. indicd) seeds topically to larvae of Pieris brassicae disrupted subsequent development and decreased growth rates. Spinning larvae and 1-day-old pupae were less susceptible. Five-day-old pupae were unaffected.

Przbyszewski (1993) observed the A. indica seed and leaf extracts to control the pests of cabbage. Three concentrations of simple, aqueous neem extracts from leaves (2.5, 5 and 10%) and seeds (1, 2 and 3%) were used against lepidopterous pests of cabbage in Mauritania. Extracts were made and applied with only locally available equipment. In a randomized split block design replicated 4 times, 2 blocks separated differences between starting applications with younger or older transplants. The results showed lower pest damage levels in seed extract treatmenets beginning after the 3"* application. After the 6 th application, all 3 seed extract treatments showed significantly lower pest levels.

79 pest densities and percentage heads damaged by lepidopterous pests; however,

these values were not significantly lower in the case of leaf extract treatments. All

3 concentrations of seed extracts worked equally well. Separate control plots

showed lower densities of lepidopterous than integrated control plots. The younger

transplant block showed consistently lower densities of Lepidoptera than the older

transplant block.

Joshi et aL (1993) evaluated the bio efficacy oiA. indica, mahua {Madhuca

longifolia) and pongamia oils (2 and 4%) and neem and Pongamia seed extracts

(2%) against Phyllocnistis citrella on limes in Kamataka, India. All the treatments

reduced the pest population, with neem seed extract being the most effective.

Devraj and Srilatha (1993) determined the antifeedant and repellent properties of extracts of neem, mustard. Datura, Eucalyptus and lemon grass

{Cymbopogan sp.) against the pyralid Corcyra cephalonica. Neem extract had the greatest antifeedant activity followed by Eucalyptus, lemon grass, mustard and

Datura extracts, respectively. Eucalyptus extract was the most repellent, followed by lemon grass, mustard, neem and Datura extracts.

Rao et aL (1993) studied the effects of botanicals on certain behavioural responses and on the growth inhibition of 51 litura. Biosol, Neemark, Repelin and neem oil were tested at 0.5-3.0 percent against larvae of 5. litura in the laboratory.

Repellency, antifeedant activity and development period increased with increase in concentration of all 4 biopesticides. Adult emergence, growth, survival, larval and

80 pupal weight, number of eggs laid and hatchability of eggs decreased with

increase in concentration. Neem oil had the greatest effects, followed by Neemark,

Biosol and Repelin.

Bhiyan and Hossain (1996) studied the growth inhibiting effects of neem

and sesame oils on jute hairy caterpillar, Spilosoma obliqua Walker. First to 4'*'

instar larvae were fed on treated jute leaves with either 1-5 percent neem oil or

0.1-0.5 percent sesame oil alone or in combination of both. The results indicated

serious growth inhibiting effects on the developing larvae depending upon the

concentrations of the oils. Such effects were extended larval period (6-7 instars),

reduction in larval weight and size, blackish spots on the larval bodies, hairless

larvae, sluggish movement, slow feeding accompanied by high mortality in each moulting stage and development of abnormal pupae. It is found that most larvae fed jute leaves treated with 1-3 percent neem oil could survive to last instar with hairless and discoloured bodies and elongated larval period upto 20-28 days. Some larvae failed to complete the larval period or died before pupation. Very few of them pupated usually with abnormally low weight, or shrinked and cracked heads and bodies. At higher concentrations (4-5%) almost all larvae failed to survive to pupation and showed abnormalities in head and body with often transparent liquid oozing from the larval bodies.

Neem oil combined with sesame oil showed synergistic effects indicating higher mortality at early and late instars and occasionally very small number of

8] larvae survived till pupation. Sesame oil alone did not show any remarkable

growth inhibiting effect on jute hairy caterpillar. All these facts showed potential

growth inhibitor in jute hairy caterpillar and can be integrated with appropriate

cultural and biological pest control tactics.

Sannaveerappanavar and Viraktamath (1997) observed the IGR activity of aqueous neem seed kernel extract (NSKE) aginst 3"* and 4''' instar larvae of

diamond moth, Plutella xylostella L. in the laboratory. The NSKE (2-4%) caused

complete mortality within 5-11 days. The majority of 3"* instar larvae died without moulting and all larvae failed to pupate. At lower concentrations of NSKE (0.5-

1%), lower mortality was observed, though several surviving larvae either failed to pupate or died in the pupal stage. At all concentrations of NSKE, there was a prolongation of the larval period, and death occurred at the time of moulting.

Azadirachtin sample SPIC SSF 22 was effective against 2"*^ instar larvae.

Treatment of 2^ instar larvae with a sublethal dose of 1 ng/insect ledto considerable growth inhibition for a period of time after which the insects died.

Similarly, treatment of final instar larvae with different doses of azadirachtin led to a proportionate inhibition of larval growth, subsequently also affecting pupation. Plumbagin was not as effective as azadirachtin.

Behera and Satapathy (1998) tested eight indigenous plant extracts at concentrations of 10.0, 5.0, 2.5 and 1.25 percent to assess their effects on growth and development of Spodoptera litttra. Indian laurel (Laurelia sp.) and neem (A.

82 indica) applied topically, and karanj (Pongamia pinnata) applied by the leaf dip

method, prolonged the duration of the larval period significantly at all

concentrations. Sweet flag {Acorus calamus) induced the highest percentage abnormalities due to morphogenetic effects both by leaf dip (38.6%) and topical

(37.3%) application, followed by neem applied by leaf dip (33.3%), Indiana laurel

(33.3%) and karanj (33.3%), both applied topically.

Govindachari ei al. (1998) evaluated the antifeedant and insect growth regulating activities of salanin, nimbin, and 6 deacetylnimbin, in comparison with azadirachtin A on Spodoptera litura, Pericallia ricini and Oxya fuscovittata.

Salanin deterred feeding, delayed moulting by increasing larval duration, caused larval and puapl mortalities, and decreased pupal weights into the two

Lepidoptera. Salannin also caused moult delays and nymphal mortalities in O. fuscovittata.

Chandra and Chakravorty (1998) bio efficacy of neem oil on the development of rice moth, Corcyra cephalonica. Larvae were collected from the stock culture maintained in the laboratory. The antifeedant azadiracthitn (0.03%) was treated as nimbecidine. The doses taken were 0.25, 0.50, 0.75 and 1.00 ml per

20 g seeds. The observation revealed normal, deformed and non-emerged adults.

The deformed and non-emerged adults had crumpled or twisted wings. It was also observed that last instar larvae, pupae and adults from different treatments and control varied significantly with respect to their length, body weight and wing

S2 span. Thus the Nimbecidine (0.03%) is an effective growth and development- inhibiting chemical when taken with food by newly hatched to mature larvae of C. cephalonica.

84 ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^

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a/i

'fffr-fr-fr'fr'fr'fr'ff^'fr'fr'fr'ff-ff'frfr^-f' Materials and Methods

The effects of natural plant products and non-edible seed oils on the sugarcane stalk borer, Chilo auricilius (Dudgeon) a pest of sugarcane were investigated in the laboratory conditions. Department of Entomology Chandra

Shekhar Azad University of Agriculture & Technology, Kanpur & partially in

Deptt. of Zoology Aligarh Muslim University Aligarh 202002 UP India, during the year of 1999-2005.

Chilo auricilius (Dudgeon) culture of Method (Rearing & their maintenance)

Adults of Chilo auricilius were collected from field sugarcane of Tarai

Region of UP and Uttaranchal, India. Rearing of Chilo auricilius was made under laboratory at 27 ± 2°C and 65 ± 5V RH. on the artificial diet along with some pieces of sugarcane. The standard rearing technique developed by Mehta &

David (1978) was followed.

Freshly emerged moths (10 pairs) were released for egg laying on potted sugarcane plants (about 60 days old) covered with iron wire mesh oviposition cage. After 4 days the eggs were collected and sterilized with 10 percent formaldehyde for 2 minutes and washed with distilled water and allowed for drying over a filter paper. Then the eggs were kept at room temperature. About fifty blackhead stage eggs were inoculated per diet bottle. The diet bottles were kept upside down in a wooden rack.

85 The larvae were transferred to fresh diet once in 10-12 days. At the first change 30 larvae^ottie and at the second change 15 larvae/bottle were introduced and reared until pupation. The larvae were disinfected with 10 percent alcohol and washed with distilled water, if saprophytic fungal growth was noticed on the diet.

The pupae were collected, disinfected with 10 percent alcohol and washed with distilled water. After drying over a filter paper, healthy pupae were transferred to petridishes with filter paper at the bottom. Pupae with disease symptoms were discarded. The petridishes with pupae were placed in an emergence cage provided with moistened synthetic sponge at the bottom. On emergence moths were collected and released for egg laying in the oviposition cage prepared as above.

Extraction of non-edibie seed oils

Seeds of Madhnca longifolia koen (common name in India Mahua),

Pongamia pinnata Pierra (common name in India Karanj), Ricinus communis L

(common name in India Castor) and Azadirachta indica A. Juss (common name in

India neem) were collected and the oil was extracted after decortification. Oil extraction was done with crushers and these oil were stored in 7-lO^C

(Refrigerator) for the purpose of testing, emulsion were prepared in distilled water and 1.66 percent Teepol (a liquid detergent) was used as emulsified. The

Petroleum ether, Chloroform, Methanol and Distilled Water were used in the extraction process.

86 Plant material used in experiment

The plants for test were chosen on the basis of their resistance to insect

attacic on already known poisonous properties or due to the presence of

odoriferous components in them. The plant materials used in the experiments are mentioned in the Table no. 1. Sequential extraction of plant material

The plants were collected and air-dried under shade at room termperature.

Dried materials were powdered in simple electric gjiending mill. A 100 gm sample of the ground plant material was taken for extraction. The sequential extraction of plant material was carried out in a Soxhlet extractor using different solvents in a sequence on the basis of their polarity. The sequence of solvents was as follow: Petroleum ether. Chloroform, Methanol and Distt. water. The plant materials were extracted at 40-100''C for 20-24 hrs with each solvent accordingly

(Fig. 1). The solvents were removed with the help of flash point evaporator and the extracts were stored in refrigerator.

Preparation of test solution

In the experiment, 10 mg of each fraction which was diluted to 50 ml with analytic reagent (AR) grade acetone. The test solution's of required concentrations was prepared by diluting the required quantity of above stock solution with acetone and makeup the volume to 100 ml in a volumetric flask.

87 Dried and Powdered Plant Material

20-24 hrs Petroleum ether 250 ml

I > Fraetion - 1 Residiii

20-24 hrs Chloroibrm 250 ml f i Fraetion - 2 Residui

20-24 hrs Methanol ^S() ml 1 Fraetion - 3 Residue

20-24 hrs Distilled water V Fraetion - 4

Fig 1: Sequential Extraction

88 Experimental evaluation for different plant extracts and non-edible seed oils:

Achieved/outcome of plant extracts and non-edible seed oils on the ovipositional behaviour, viability of eggs and incubation period.

Oviposition jars of (6 x 8") were used for the study purpose & each jar was provided with two cm thick layer of moist sand placed at the bottom of the jars.

The sand layer was covered with a circular piece of paper. This paper was divided in to five sectors of equal areas. The inner sidewall was also lined with paper, which was divided into five strips of equal area. Each strip/sector was treated with different flections of a particular plant oil product dissolved in acetone. In addition, one strip/sector was treated with acetone only and untreated check was also kept. The strip and sector were placed in such a manner that they had same treatment. Two pairs of newly emerged adults were released inside each jar and the mouth of the jar was covered with muslin cloth.

In the studies pertaining with non-edible seed oils, only five strips/sector were kept where four pairs of adults were released. Three concentrations viz., 5,

10, 20 percent were carried out for testing. Each test was replicated three times in plant extracts and non-edible seed oils. The following observations were recorded at an interval of 3-4 days after release of moths. Number of egg masses laid on each strips/sector of paper.

The eggs fi-om each strip and sector were kept in petridishes and the numbers of larvae hatched were recorded everyday. From these observations, the

89 incubation period, viability and oviposition index was calculated. The oviposition

index was calculated by using the following formula.

Average numbers of eggs laid by ^ . .^. . J the female on the treated surface Oviposition index = Average number of eggs laid by the female on the untreated surface

Ovicidal action of different plant extracts and non-edible seed oils against the eggs of Chilo auricilius. The ovicidal action of different plant extracts and non-edible seed oils against the eggs of Chilo auricilius were carried out at controlled temperature and humidity. The homogenous egg mass of one-two and three days age were selected.

A minimum of two egg masses were dipped in plant extract or non-edible seed oil for five second. Six concentrations viz. 2, 4, 8, 10, 15, and 20 percent were tested against eggs of different age groups. The check (acetone treated) and untreated

(control) was also run simultaneously.

The average percentage of eggs hatched was recorded. The experiment was replicated three times for each concentration.

The observed percent ovicidal activity was corrected by using Abbott's formula

(1925):

^ 100-c

Where,

P' = Corrected mortality percent in the test eggs.

P = Observed mortality percent in the test eggs. 90 C = Percent mortality in the control.

The corrected percent mortaUty were obtained and used for further

calculations.

Insecticidal activity of different plant extracts and non-edible seed oils against the larvae of Chilo auricilius.

In the present investigation, two to three days old newly hatched larvae

were used for screening of different non-edible seed oils and plant extracts. By

using the foliar application method, the survival of larvae was studied separately at

2, 4, 8, 10, 15 and 20 percent concentrations of plant extracts and non-edible seed

oils in the jars under controlled conditions.

The mixture of effective non-edible seed oils were also studied at 5, 10, 20 percent concentrations of oil in the ratio (1:1), (1:2) and (1:4) against (2 to 3 days old) newly emerged larvae.

For the foliar application method, five to ten inch fresh clean whorls of sugarcane were used. The pieces were treated with the help of automizer using desired concentrations. Before providing for feeding to the larvae, treated leaf whorls were dried under the fan for few minutes. Twenty larvae were released with the help of camel hairbrush in each replication. The experiment was replicated in 3 times for each concentration along with check (acetone) and control.

During the experimental period, the lower portion of sugarcane whorl was

91 covered tightly with moist cotton to avoid the loss of moisture; Numbers of larvae

survived were recorded after 24, 48 and 72 hrs after release.

Residual toxicity of different effective plant extract & non- edible seed oils:

The residual toxicity of different effective plant extracts and non-edible

seed oils were evaluated by releasing the insects at different intervals on the

sugarcane plants treated with different concentrations. The percent mortality was

recorded 24 hrs after release and the PT value for each concentration was

calculated. The plant products used for the residual toxicity are listed. (Table no 1)

The fresh pieces of sugarcane were sprayed with different concentrations of

non-edible seed oil and plant extracts. After 1 hrs of spraying one plant of each treatment and twenty-five first instar larvae released in the whorl of each plant for fiirther observations.

The observations were recorded 24 hrs after release of larvae in each treatment. The plants were dissected and the numbers of larvae survived were recorded and percent mortality was calculated. Everyday, larvae were released on one plant and mortality recorded after 24 hrs as per the procedure stated above.

This was continued for the day till no mortality was recorded in each treatment.

The average toxicity was calculated by dividing the total of percent mortality by the number of observations. Based on the period for which toxicity persisted and the average residual toxicity, PT values were computed. This was taken as an index for the degree of persistence. These experiments were run in triplicate for each concentration. 92 Statistical procedure:

The data pertaining to different experiments were subjected to statistical

analysis by following standard practices.

The data were analyzed as completely randomized design (CRD). The sever root

transformation was used in ovipositional behaviour experiments by adding a factor

of 0.5, while in ovicidal and survival experiments the data were transformed by

using angular transformation.

LC 30, LC 50 and LC 90 for effective plant extracts and non-edible seed oils

were estimated by the probit analysis method following Finney (1952), The relative toxicity of the extracts and non-edible seed oils for insecticidal action was computed using Endosulfan 35 EC @ 0.5 kg a.i./ha as the standard. The toxicit>' ratio was calculated by using the following formula given by Jotwani et al.

(1961).

LC value of the standard insecticide Toxicity ratio = LC value of the candidate insecticide

Residual toxicity data were subjected to PT value calculations following

Rati and Sharma (1982).

The analysis was carried out by "micro-32" computer.

93 List of plant products

SI. Common Family Part that have No. Scientific Name Name been used (India)

1. Eucalyptus globulus Lemon gum Myrtaceae Leaves Labill. 2. Callistemon citrinus Bottle brush Myrtaceae Leaves and fruits DC 3. Bougainvillea Bougainvillea Nyctaginaceae Leaves and spectibili (Wild) flowers

4. Azadirachta indica A. Neem Meliaceae Leaves juss. 5. Murrya koenigii L. Sweet neem Rutaceae Leaves spreng 6. Cannabis saliva Linn. Bhang Cannabaceae Leaves

7. Calotropis Madar Asclepiadaceae Leaves procera,V^'\\A 8. Thuja compacta Morpankhi Cupressaceae Leaves

9. Lantana camara Linn. Lantana Verbenaceae Leaves

10. Nerium indicum Mill. Kaner Apocynaceae Leaves

11. Rauvalfia serpentina Sarpgandha Apocynaceae Roots Benths 12. Hibiscus rosasinensis Gurual Leaves Linn. 13. Diplazium esculantum Fern Polypodeacae Leaves (Ratz)

14. Cymbopogan Lemongrass Poacea Leaves Flexuosus Stapf

15. Mantha piperata Linn. Pudeena Lamiaceae Leaves

Table No.l

94 f f f f f f f f f f f f f KjXesult f f f f f t cJJiscusswn f f f t f Result and Discussion

Stalk borer, Chilo auricilius Dudgeon:

The stalk borer moth laid eggs on any portion of foliage on cane stalk. On

hatching the larvae feed on the spindle and leaf sheath before boring in to the main

stalk. There were mined marks present in the leaf sheath. The larvae bore into

shoot causing dead-hearts of spindle leaf, second and third leaf In the tillering

stage of the plant, the borer larvae formed dead-heart upto forth leaf In the cane

stage of the crop, there were more numbers of bored holes below the leaf sheath

on the intemodes portion than the open cane intemode. The holes made by this

pest were more or less symmetrical in appearance.

After boring in the intemodal protion borer made a tunnel extending upto

more than one intemode. The pest incidence toxicity of plant extract and non- edible were evaluated on stalk borer Chilo auricilius (Dudgeon).

1. Bioefficacy of plant extracts against Chilo auricilius Effect oiEucalyptus globulus leaves extracts:

Eucalyptus is a perennial flowering tree, which is commonly found in

Tropical, Subtropical and Mediterranean areas. It is a medicinal plant, which has some addition economic value. The different extracts of Eucalyptus were tested against C. auricilius and results obtained in different experiments are described.

Effect on oviposition: The selection of oviposition sites in choice experiment showed that the female gave less preference to the sites, which were treated with

95 different concentration of petroleum ether, chloroform, methanol and Distt. water

extracts. However, it was found that methanol extract treated strips/sectors

completely deterred the female from oviposition site at all the levels of extracts,

while the other tested extracts were not found to be very much effective (Table 2).

It was recorded that the viability of eggs, which were deposited on

petroleum ether extract treated strips/sectors were significantly reduced at all the

concentrations (5, 10, 20 percents), while the chloroform and Distt. water extracts

were not able to reduce the viability of eggs.

The oviposition index did not revealed any significant differences except on

methanol extract treated strip/sector, which did not receive the eggs (Table 2). The

average number of eggs masses were highest on Distt. water extract (12, 12 and

11) and petroleum ether extract (9, 12 and 10) treated strips/sectors at 5, 10 and 20

percent concentrations of respective extracts, while it was comparatively lower on

chloroform extract treated strips/sectors (6, 6 and 5) at the similar concentrations.

It was also observed that hatching period was three days in all the treatments. Effect on larval survival:

It was revealed from the Table 3 that 20 percent concentration of methanol

extract after 24 hrs exposure treatment gave the lowest survival of larvae (55.00 percent) and was found better than all other treatments. It remained static after 48 and 72 hrs. It was clear from the data that it had quick knock down effect to kill the larvae. The petroleum ether, Chloroform and Distilled water extracts were not

96 o

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treatments were better than control and check.

The 10 percent concentration of methanol extract reduced the survival of

larvae (70.33, 65.00, 63.00 percent) after 24, 48, 72 hrs exposure. It was found that

lower concentration of extracts revealed very little effect on the survival. The data

showed that factors a (solvent) b (concentration) and their interaction were highly

significant in 24,48 and 72 hrs respectively.

Pandey et aL (1998) reported field experiments were conducted India to

determine the efficacy of plant products as insecticides for the control of S. excerptalis. The lowest number of pests (6.35 & 6.17%) was observed following treatments with Eucalyptus rostra (3%) compared to the untreated control (16.88 and 15.77%) respectively followed by Azadirachta indica and E. rostrata (2% solution). Ovicidal action:

It was observed form Table 4 that all the extracts tested against one day, two days and three days old eggs of C. auricilius did not show significant differences in reducing the survival of eggs, however, they showed superiority over control. In general, it was foimd that three days old eggs were the most susceptible stage when compared to two days and one day old.

For one day old eggs, it was observed (Table 7) that the different concentrations of extracts like petroleum ether (20 percent), chloroform (10 and 20 percent) methanol (20 percent) and water (20 percent) extracts were found to be

99 c in o a^ o vo o r- in 00 r-

o ro vo en o ^ o ro o in o

o ro en ro CO (M in o ^ CTi Pll 00 ^ r- in

o in o o ro O EN o ro o in o vo o vo O O o ^ O o O fO ill' cs in m ro in o ^-Siu 00 ^ r- in s? ,.^ .^ _^

o n o ro o rn o r- o o -H r^ t^ ^ IT) o r- E o^ vo in o ^O 00 nil CO vo o o o o rH rM I O CD o in o tn o ^ o o o o o m o vo in r- U3 00 00 ^ r^ in 00 vo CO '•D

C/3 *S P e U o in s? ^^ ^^ ,_^ o o >n CM r- CD in vo o fe E 2 O •^S' VO

(A M > 6t J ^ o en CO O vo o V o .-I 2 u o m o uo o \o o o m at c a "o i-o >. Cl CN >i u = "S o n u CO VD r- in B s 4> C ^ o in o 5 cs o ro vo r~

'3 o m o "^ o in o ro £ E « C8 o vo o '^ o o o CL ZS S JS k V V *^ *rf o ro Ml to to O 00 V£) c c ^ ^ 0) (X) ^D C C • • rr (A Z 09 O s •s; _ ~ <^ = o H jl U superior over control and gave 78.00, 77.00, 75.00, 74.00, and 77.00 percents

survival of eggs respectively.

In case of three days old eggs, it was observed that the extracts like

petroleum ether (10 and 20 percent), chloroform extract (10 and 20 percent),

methanol extract (10 and 20 percent) and Distt. water (20 percent) extracts were

found to be well superior over control and gave 75.00, 74.00, 68.00, 66.00, 68.00,

66.00 and 74.00 percents survival of eggs respectively. However, factors a

(solution) and b (concentration) were highly significant while their interaction showed non-significant.

Juvenile hormone activity of E. globulus extracts was reported by

Rajendran and Gopalan in 1978 against Dysdercus cingulatus fabricius (V* instar nymph) while Chockalingain (1986) reported that Eucalyptus (leaves) extract inhibited the feeding activity ofSpodoptera litura Fabricius.

The E. globulus mainly contains cineole and also have minor components of X - pinene, aldehyde and sesquiterpenes (Singh et al.j 1986). It is possible that anti-ovipositional, insecticidal, antifeedant, deterrent and ovicidal activity of methanol extract was probably due to the presence of high percent of active compounds, which might be the responsible for these activities.

So, these active compounds, which were obtained through methanol extraction, could be utilized in managing the Chilo auricilius stalk borer population from very early stage of damage. It was due to the fact that it had high repellent, deterrent, and antifeedant activities. Laboratory evaluation of these

101 extracts would indicate their further possibilities of using these active compounds in the field's conditions.

Bio efficacy of Callistemon citrinus D.C. leaves and fruits extract:

Callistemon citrinus is commonly known in India as bottlebrush. It is a perennial tree or woody like climber and having beautiful flowers. It commonly occurs in Tropical areas. A study was carried out under the laboratory conditions to assess the effects of leaves and fruits extracts of Callistemon citrinus on

Chilo auricilius and obtained results are described.

Effect on oviposition:

Studies on the oviposition deterrency of various extracts Table 5 and 6 revealed that the petroleum ether and chloroform extracts (leaves) were superior to petroleum ether and chloroform extracts (fruits). It was observed that 5, 10 and 20 percents chloroform and petroleum ether leaves extracts were found to be significantly superior over control and gave 16.0, 14.0 and 10.0 and 17.0, 16.0 and

11.0 average number of eggs on the treated strips/sector respectively.

In the second set of experiment, the choice was given amongst the different extracts of fruits among with untreated strip/sector. The data showed that the order of (least) choice as follows: water extract 20, 10 and 5 percent concentration gave

19.00, 20,00 and 21.00 where as methanol extracts 20, 10 and 5 percents 22.00,

26.00 and 29.00. Chloroform extract 20, 10 and 5 percents 20.00, 27.00 and 31.00 and petroleum ether extract 20, 10 and 5 percent concentration were 25.00, 27.00 and 31.00. Average number of eggs deposited by the female on treated

102 s o HD _2 ,3 03 .c L. W y-s *C- f .S es o H

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j in vo \£) r^ r^ r- o n m ^ < aa o CM 00 r- X o o\ J?: „ ^ ~ iH CTl IT) [^ I^ 1^ *- ro n o cNj -ST u> OS I Q -sr o no r^ o CM 1^ s ^ in 00 1 S3 r^l -H o n o 1 E o 1^ CSI 4> B .H O rH o CM o 4^ I cs e o o u CM 1 •-I 21 -l" ^ o

w o § o w O 1 H I 2 rH 3 •*-» X I 1 V in < CM in -3

o o-^ „ ~ g' g;;^ o : CM E CM rH in tH !s U w CM O t-H o ro o M) u — O U) a u o 5^ §; V e« u (M 1. S3 1- •^^ W3 O X U u < u c E u * ^ ^5 * ft4 s in Z a.

o 03 u z OS < u £ lU ^ R OB o B U H U u 09 •w .B M £ t 2 « •* la U U 4> e £^2 U E S •< OS U strips/sectors respectively. It was observed that viability of eggs were not effected at all.

The lowest ovipostion index 0.14 was recorded on chloroform ether extract treated strip/sector at 20 percent concentration, while it was highest on check treatment at the similar concentration, which clearly indicates that check had least affect on the oviposition behavior. Similarly, in case of fruits extracts, the chloroform and water extracts both showed 0.18 oviposition index at 20 percent concentration over control Table 5 and 6. The average number of egg masses and average hatching period of eggs were not affected at all. (Table 5 and 6).

Effect on larval survival:

Perusal of Table 7 indicated that after 24 hrs exposure of different treated leaves revealed that petroleum ether extract of leaves gave maximum reduction in the survival of 3 to 4 days old larvae of C. auricilius (55.00 percent) and was better than methanol, chloroform and Distt. water extracts. However, the survival of larvae was 100 percent in control and check. The survival of larvae decreased after 48 hrs and 72 hrs exposure (48.66 and 48.66 percent) to petroleum ether leaves extract. It was observed that only higher concentration of extract had little effect on larval survival, while lower concentration of extracts were not effective of larvae at 24, 48 and 72 hrs after exposure (Table 7 and 8).

The fiiiits extracts did not have any effect on survival of larvae after 24, 48

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G C o o r- n CM o vo o °§ O CM ro cr> o ^ o r- o o nil °?. CTt 00 CO VD r- in 2?o.i ;:; s o o vo o o «x> O CTl 3 &0 m in 111 00 ^ Si U ^ ^ •n C3> 'S' 00 CsJ s (Tt r- CM o in o n t (8 s "^ 14

B S E X B H O "Ii l II u ta. c O 00 in iT) uT r- o r- rH «-H ^ O f-t 1^ CO CTi CO

O T o o o m o in O 00 O 1) O ^ o in o vc o ^o o r^ O r~i O rH 00 CO in r- (T» CO

o ^ O rH ro cTi O T O 00 O 00

CO ro O i-t O rH 111 O^ 00 (7^ r- 00 i^ :^2

O - U o ro o ro o in O rH fO (T> fe 2 ? O ^D O 00 ro

9i o in o in O rH O O o

o ro in m in •3 B o CM o o o 03 o ^ CM in cn o 5? 0* VI in IT) O '•D tH C\J o o ^ 1^ O CTv r- ro CM ^ ro in 00 o o o r- in a^ eii 10 10 2S f-H 2; -^ ^°1 c c R

o o o r- o in o tn o a\ k 2 ? o ^ O VD o "^ o in O PO in 00 CM ro iH CM in r- S £ "5 00 \D *^ ^?1 5? __^ „ ^^ tn in in 1-1 O CM O 'a ^rf m cTt t-H o Q S E O 00 O 00 o

_2 Pll ri?' r^ *^ i o O O CO '^ CS) o in « Si o O o ^ VD in o o o , CO cr> CM U3 OO o , c IS u 21 - cTi r- 00 r- CO "X" ra a: cr a> C^O^ r^ o « H o o O •«3* p = «J CO -2 fe E 2 c in r- o s III! c 107 eo ec 0) (0 CZ3 * * c c 00 EA

«< a «_ eI C?: E e eg - 00 o e o •x: S a S = .2 jl U H and 72 hrs exposure. None of the fruits extracts were found to be significantly

superior over control.

However, table 7 revealed that factors a and b (solvent and concentration.)

showed highly significant at 24, 48 and 72 hrs exposure respectively.

Ovicidal action:

Perusal of Table 9 and 10 indicated that the tested leaves and fruits extract had slight variation in their efficacy against the eggs of C. auricilins. It was observed that leaves extract were slightly superior than fruits extract. It can be explained on the basis of the fact, there were some changes in chemical constuents of fruits that occured at the time of maturity.

In general, there was higher susceptibility of older eggs (two and three days old), when compared to newly deposited eggs (one day old). The chloroform leaves extract gave the lowest survival (61.00 percent) of three days old eggs at 20 percent concentration and ranked better than methanol leaves extract (69.00 percent), when it was tested at 20 percent concentration and observation recorded after 24 hrs. The 10 percent concentration of chloroform and methanol leaves extracts were also found to be significantly superior over control on three days old eggs. For three days old eggs, 20 and 10 percent concentrations of methanol leaves extract proved more or less equally effective. The 10 percent concentration of chloroform leaves extract also minimized the survival of eggs (64.00 percent) significantly than rest of the other treatments. The survival of three days old eggs

108 B O c lO 00 o rg in r- in m in o cs (N O rg o (N 00 R

in o (Ni 00 o r- 00 tn r- in r- in vo in O C

o o o o in o in o o o o c« U o o ro o n o •-* o «x» II II CM 00 o T in < oa M ml in in oo cj\ r- 5? "S O CO o o o in o 00 o o o O >-! n CM p" — 88 VI € O U o ^ o o o C3^ o o o o\ 00 IT) o ro >1 in o 00 o •X) en o ^ in n in in oo a\ p- Q •a in in O 2^ 4* 1» u JS o m o 00 o in o ro o o VD o o o o o o o o en O O <7^ H -H "T CO in o (M 00 o KD C3^ o ^ in E n CO in in in in oo i| C/u3 .^• o•

o o o o in o VD o o iE o a\ o o o o o o VD o o\ \p o in o CD 00 o O ^ in in 00 in in (0 tn

O VD in r^ cr» r- VD r- VD r- in 00 VD CO r*

.§ „„^ o r__o^ o en O C_M o o,^ o ,m^ O tH •5^5« ^s O VD o o O

'—• "•^ "^^ ^ " -H ix> in o in _ _ _ _^ E 00 CM vo in o ro o ro o in O CM o vo O O rH ^ O VD o o o ro o ^ O P- o o O CTH iH O t-H .H ro c\j

O 00 in o -q* 00 tn p- a\ O tH iJl CO VD (- VD r- in r~ in VD in 00 vo a\ r~ •I O CO o ro o in VD in o in O Ol o o^ o "g* o o o m VD TT O

o in o O CTi o in o (J^ o in o in O (T> I CM 00 in "a* o r^ in VD in o o o O O CM in 00 CM VD O ^ a\ ro 1. «^ •^ Ml CO CM CO CO vc V n '^ •o u —' i u O VD o r- o in O rH O 00 o in O CT\ Sll o O CM O VD o ro o r- o ^ o o o o c 5^2 TO CO 00 VD O ^

'3 O VD o ro o ro o ro o ro o in o a\ CO vo p- VD p- vo CO vo oo VD C 1%9 TO re «A C ON e u 09 Islfe

I L. •z -u a Q•^ -" iS* — X 01

O OD O rH 111 a> r- e « o n o m o r^ o in O rH o c\ U o r- o t^ o m o r- ro r- vD O ro 00 in r- o c t^ in r~ in CD Vf> "5 «^ .2 c o o o in >^ in o ^r O CT\ II II o ^ o ^ o r- o r> i£) O in o cr» o in r^ o m r- in 03 r- III: 00 >« CD VD 5^ ,-^ n en 00 00

M (NJ n s •5^1« tit r- E 00 U3 O CO 00 (NJ in o CO m (/u3 o •o Q - * 00 VD

o n o m o in o in o in o in o n lo r- o vo o vo a o O 00 O 00 sc to 10 m to o n O fO 00 CM in o CO (y\ 00 00 ^

p _ u o in o ro C3 ro o in VD rH o r- o r^ O VD o ro VD r- o o O CM fe E 2 O CO eft CM in o CO O 00 O ^ ^-. 00 y? 00 VO P- VD r- VD 00 r- 00 r- 1X1 CM I m^rf ^ O) CM ro M Q •^ n o ro o ro o CO O in o in o in o in U O VD o VD O ro o ro o 00 O CO I o ro o P- 00 en 00 0\ CO VD 00 vo VD VD r~~ in 00 VD 00 vo nil -H n in o u S O T o in o o VD a^ o o in o in o o vo c^^ VO in o o O 00 en n ** CD "^ o

to tn to tn o m O 1^ o r~ o in O UJ o r- O V£> o n c c C c 9i r- c\ GO 5= * £ 00 H> 00 U) '5 s^ o ^ o .-H CO tn CO in <—( O ro vc o c INI in r~ CO o |1| GO '^ « e u

%-< O VD o r- o o O CN o ^ o O. 03 I s M vx> o 03 a> VD r-l CO O at? ^ 00 «^ 00 ID E in CM u o -^ • mm ro CM o tn o ro o in v£) in o in o o o vc O iH o o '> ^ ^ O 00 VD 00 00

c u liife o c o u o OS < H u was 89.00 percent in check and slightly lower than that recorded in untreated eggs

(94.00 percent). Table 9

The data showed in Table 9 and 10 that factor b (concentration) of leaves and fruits extracts were highly significant at One, Two and Three days old eggs.

However, adverse morphogenetic and gonadotrophic effects of Australian bottle brush, Callistemon lanceolatus had been reported in case Dysedurcus koengii fabricius, when extract were applied topically on final instar nymph

(Katiyar and Srivastava, 1982).

Chemically, the bottle brush plant have high amount of alkaloids, which might be responsible for deterrent, ovicidal and antifeedant activity against C. auricilius. Among the various extracts of this plant, it was recorded that chloroform leaves extract had affected the oviposition, while survival activity of larvae was affected by petroleum ether and methanol leaves extract. The chloroform leaves extract showed ovicidal activity, while the fruits extracts remained uneffective against C. auricilius.

Effects on Bougainvillea spectibili (Wild) leaves and flowers extracts :-

Bougainvillea is a woody climber , which is commonly found in Tropical and Subtropical regions. It is very commonly grown in gardens for its handsome bracts. The biological activities obtained from this plant.

Effect on oviposition:

Studies on the oviposition (leaves and flowers) revealed that the number of

111 eggs laid on untreated area (control) was more than those of all other treatments.

The petroleum ether flowers extract was found to be highly effective and

completely deterred the female form oviposition sites. The other flowers extract

did not showed effectiveness over control and check, while it was found that

petroleum ether flowers extract and methanol flowers extracts were completely

inhibited the viability of eggs at all 5, 10 and 20 percent concentration. The

chloroform and Distt. water extract of flowers were also reduced the viability of

eggs. Table 11 and 12.

The 20, 10 and 5 percent concentrations of petroleum ether extracts gave

7.00, 8.00 and 11.00 eggs on respective treated strips/sectors and stood better than

chloroform, methanol and Distt. water leaves extracts and these treatments were

also found to be better than control and check Table 11. However, it was found

that viability of eggs were inhibited by all the leaves extracts.

The lowest oviposition index (0.10) was recorded at 10 and 20 percent level

of petroleum ether leaves extract, while other oviposition indexes revealed more or

less similar ratio of eggs over control Table 11. The oviposition indexes were not

at all the tested concentrations of petroleum ether flowers extract, while the other

oviposition indexes were found to be more or less similar over control (Table 12).

The average size of egg masses varied from 1.0 to 12.0 on treated

strips/sectors of leaves extracts, while it ranges from 5.0 to 7.0 egg masses on treated strips/sectors of flowers extracts (Table 11 and 12). The hatching period of eggs, which were deposited on treated strips/sectors found to be least affected.

112 c o bc _o CM s *n* !e L. O .-V B •a , O .c .2 to o 4. t •» ^2? ou -—

L. in • MM < O U c O In CM O _o

•fi ») 's O g 1 H V M O w OC MD u 03 «« B u •*u« O w 03 > k. -< X in 01 B u o> ^ B > ^ o r- ro o B o CN CD < CQ CM X _o o o O O o o o o o .-* V •** u o B •"B" u "5 o r- fsj O (NJ O (M O CO 00 0) ^ri o fH r- p^ o> iT) O in o y£> o O5 >^H rH o u 5? „ „ „ a «rt CM ^D iH O 1X> 00 .S- ^•^03 -w CO IT) "a- "O" m E 1 UJ iH O r^ O csi o a -«m^ B e JS _© Cft o o ei) «O«S c o u o Ue n •* CM o ^ > in O .-I < in cs SS ^ £ C SS , ,-^ ,-^ CO V) ro cr i-H 1—1 CM i-H s =^S b- CM CNJ u M) St. i-H CJ (_i i-H O V IS o ^ 0* c« o «rt « ."S O O. MS iH 9> o OS — 03 L« ;> 1. crt u X 44 < 1> M * + (0 (0 + + s 4-» + + C C in 1/1 3 V * \ Su3. D. C Vi cQ L. B < o 09 01 •»- •!« D U < OQ : (U ^ 2 c^l< = 1. V o « u in <

E o o o _o M "5 •e in B «• < U B U V I E > ul o ^ ID VO O -ST II II B o CM 00 o M M _o o o o •< eo V «rf •o B u •B^ "S o o ^ O CTi in <

IT. CN CO o^ Q o o 9 o [^ 1 CA vo ^ 03 r:^ o a B S Ml u 0* ,5S o o o §7. 3 «i« cw V E B CM ;f2 -H cTi in •A JU V ^^ a i~ in 61) E UD St c u C/2 o o o 9i B -e o o (M « 2 ^iri o o r~ O eg w

« X w > ec w + S < c + s in H-4 Z o.

Vi CO •fc- B w E a» •— O Q < 4> ^ (fa •S £ k. E U •=. « m - X i « O « L. u H £ u I < « ill•" x while the hatching period of eggs, which were laid on chloroform and methanol

leaves extracts treated strips/sector varied from 6 to 7 days. It was only 3 days in control and check treatments (Table 11 and 12).

Effect on larval survival:

Table 13 showed that at 20 percent concentration after 24 hrs exposure of petroleum ether leaves extract gave the lowest survival (50.33 percent) of larvae of

C auricilins and better than chloroform leaves extract (70.00 percent). Similarly, the 20 percent concentration of methanol and Distt. water leaves extracts gave

(73.33 and 78.00 percent) similar effects on larval survival.

At 10 percent concentration, petroleum ether (60.00 percent) and chloroform (70.00 percent) leaves extracts were found to be superior over Distt. water (80.00 percent) and methanol (81.00 percent) leaves extracts. However, it was found that time exposures, 48 and 72 hrs after treatments did not effect the survival of larvae.

Table No. 13 data showed that factors a (solvent) factor b (concentration) and their interactions were highly significant at 24 hrs, 48 hrs and 72 hrs respectively. The methanol flowers extract was found to be the most effective in reducing the survival (40.00 percent) of larvae and better than petroleum ether flowers extract (61.00 percent) at 20 percent concentration, after 24 hrs exposure.

It was recorded that other extracts also have some effects on larval survival (Table

14). After 48 hrs of treatment the survival of larvae in methanol flowers extract

115 iD in tn T-H c CM ^ O (M ^ it en o r- CO r- CD in r- in

1^ o in o o '^ °i o 00 o O rH (X> (X> ml 2§ r- 00 00 CO y> S oi

o ^ o in O rH O t-H O rH O 00 O Csl O Csl

(J^ o 00 ai lO r~ Pi 00 r^ 00 VO 00 VD 00 VO CO VO s§ o O _ U o en U3 in O GO O CO }; E 5 o in O L. b m in m un in o 00 in CD in 00 <^ GO '^ \£) in \£> in ^•^ si 2: = o o o o\ o in O 00 O rH O CTt II II o m o rn o in O ^ O (7^ 00 in 00 <7l O T < ce III 00 ^O VD in in ^ in ^ ^?1 5? o o fT) rH ID ro 03 in m a . . rH in •^ rH CT^ r- r- VD ^z U "

o r- o ^ O ^r o r- •5-2lSJ O CN) O 00 O 00 o in CM lO in m 00 r- ID in CO in KO O fa] a- * a\ 00 o\ 00 (T\ CD m 00 ^21 ss

o in o m o in O rH O CO O 00 o o o oi OS O rH GO C\ 00 o^ VO 00 > I'l 00 VO oo vo 00 lO 00 V£> :=i2i ^?i E 3 o o o m o r> o in o ^n o O 00 o ^ O in o O VD O VD 00 <^ 00 V£> r- in r^ in s? , , ^_, PI V, •^ rH CTi r\j cc in d rH r- r' ^R^ ^ . m ID ^ o o CO CD O T- Q CM CM n V s O 00 O rH §: 00 a^ 00 CN

'cs en * + •* * * -» c« o O O 00 o tn E * * * * * ,_ .J. i- " ^§ o o O o o °g CO rn in O m 00 o o o m O VD CN m cr> CN r^ •T o r- o 00 o VD O rH C7) °g a r^ iD ro o r- c rH (N 00 VD rH 00 §' CS Q rH CN CN '3' T 00 00 VD OO VD in s?

o o o n o in o o in O 00 o VD o o o 00 o °i G. -M m n ro rH (^ CM fe ! 2 CO r- ID -"T 00

o o VD VD O r-t o r- SC EE « e9 O 00 VD O O 00 o r- n rH 00 CTv O VD o o o in £.2fa3 00 VD 00 VD VD in in ^ §: I r^ in : 516

B es 01 .:< B u E 11 Id o O « 08 o U u SS|| U H c o in in c-i o y:> in o in cTi in o (M fsj in r- CM U5

00 ^ oo m .-1 CD iD -a- 00 r- 00 \D u:) in

O (^ O O o n O CM o in o r- o ro o o OO in in r- o ^ in r- CN in HI; a^ 00 00 VD 00 V£> ^ <^ 1 s rl a o m O Oi O LO O (N o ^ o r- *E^ n> t: o 2 o ^ o r- o en O li> o o O CM &I u o r> O l£> 00 en 00 OD 00 in > = 00 "^ r- in KD in in ^r ro ro

00 in O f-i CO a\ CM UO CM in 00 in 03 ID « o o o r- o r~ o r- o in O CM u E 00 CM O ID O U3 o o o o tn r^ GO in eu — u X (^ in r^ in •X) in vo in CTl 00 -H .H IT) [— 1X1 ^ ro E 00 CTv O CM i-H tO

B O CO in a\ O OD in in o ro o in o in O O ^ rH CM CNJ CS O CM CM O O CM CM ^ in V- in ^ in T 4> CTi in f-t in O ^T ro a^ in *r CO -Xl CO yi GO P- 00 VX> 00 VD r^ in y£> in a\ 00 (Tt 00

5 O O O CM o ro o ro 3 o in o vx> o ^ in r- ^ I:; m o\ r- 00 »X) CO U) ^^ & o ro O GO o ^ o r- o vo o r- o r- o o O CM s§ ii O CO O VD O VD o o CO oo GO in S!J ^^ ^^ ^^ 00 <^ (^ in r- in ID in ro ro r~ u o r- O TH O tH o ro O CO o :^ o r^ u R O CM O 00 O 00 o ^ o ^ O CM O CM s? CO in O t-H O fH ^ VD o ro 00 in 00 in ii 0\ CO CO ID GO VO en GO en GO

-H CO 00 IT) r- k U o m o vx> o 00 E o n o o o c^ o (^ o r- o (N u o o ^ C= a!-w 2 r^ in e o B O CO \o en o u OS o r- in in \0 00 in

S o o O tN o o o o o in o r- o r- o r- o c in r- O --1 un r^ tn r^ C3 GO VO 00 U> Ol ^ '^ nil 4-» S? CO cn CM S-•- , n r- O CO LS es O 00 o o\ o in O CM • o 00 o ^ o t^ o r~ o ro O CM o c 03 U— i O fO o vo o "^ O CTi 9» B t; oo \D r~ in r^ in vD in "a- ro :5 °i

Q. 3 O CM O CM o n O CO — u 3 o r~ o r- O VD O ^ °§ o u -H O 00 D O fH O 1-H o m o 1i E GO VO 00 ID s§ en t/i > Viu 't O 00 O ro O GO o in o 3 o o o o o ro es CZ5 o ^ o Q. o ro in o CM GO ^^ ro .-H i-H o _c U7 00 VD r- in *x) in vD in ob nil c« 2 Q V) ii? 09 = 2 s- 00 o B U o < U (38.00 percent) at 20 percent concentration, while it was almost (60.00 percent) on petroleum ether flowers extract treated leaves.

The survival of larvae almost similar after 72 hrs exposure in all the treatments. The recorded data clearly indicated that higher concentration of methanol flowers extract was the most effective in reducing the survival of larvae

(Table 13 and 14). Data in Table 14 revealed that factors a (solvent) b

(concentration) and their interactions were highly significant at 24, 48 and 72 hrs exposure, respectively.

Ovicidal action:

Table 15 and 16 for one day old eggs, treatments like petroleum ether extracts (20 percent), chloroform leaves extract (20 percent), methanol leaves extract (20 percent), water leaves extract (20 percent), petroleum ether extract (20 percent), methanol flowers extract (10 & 20 percent) and water flower extract (20 percent) concentrations were found to be significantly superior over control and gave 77.00, 65.00, 75.00 and 77.00 percents survival of eggs respectively. Data also showed that factors a (solution) and b (concentration) they all were highly significant while their interaction showed non significant.

More or less similar effects were obtained against two days old eggs. It was observed that the eggs were susceptible as they reached at hatching point. The 20 percent concentration of flower extract showed superiority over leaves extract

118 CD f^ 00 CN in CN O iH O 00 O OD CM *X) o vo Ch rH in o O VD CD O rH IX) ID VO in CD VD en r-

o vo o CO o 00 o o en o in O

2 03 U O 00 o 00 o CN o o in O in O OJ £ o £ O T o o 00 o 00 o CO O o O VD o 41 C •" o ro o o VD O ^3* Ch VD CD O rH 00 »X) 00 VD vo VD in 00 VO n

V o in m O CN O 00 o r- o in O (N on n O CO O T-H o o O VO o r- HI VD O CN 00 o o VO 00 O rH r- in VD in 00 VD

OS m GO o ro O [^ u S E ^^ o o o in O B aj fli -fc* -fcrf kO 00 O .H a. — 6d X oo v£> = s o o t« U o o m <7^ in in 00 ^ o in e r- in r* c7> in ^ O (N o m o o II II in rH u 00 f\J P- rH in o CN 00 in r- VD 00 < oa to r^ VO r- VD r- VO r~ VD r~ in 00 VO 00 VD LO VD 00 CTl u o O GO o CO o m o O o o o O m o VO CD OD 00 00 «J Pll 00 •H VO CVJ O CT\ O VO M E r~ in 4> o o .-( O CN .-( 2 Vi O 00 o in "o O T o o M COL. >. « e *; o m ro CO in r^ VO 00 r^ in 00 VD 00 VO 09 00 IX> .2? •O s t2 O

s? O - u O IT) O IT) O Ol o in o ^ o o o o o n O (Tl o m fe ! £ r- rH in o in t^ U> CO T5 GO U} 00 VO n 00 in VO •H C\J iD r- n ro r^ t^ o m o vo o n o en o in Q ^ 2 i l£ o o O 1^ o o o o U CM «5 (Tl CM CO (M VD GO £^5 CO VO o -H en ro 00 C^ VO VO *^ E 00 VO iH 00 n VD (J in (Ti in CM o m u rH O 03 o "^ a 4> en m VO 00 r- in CO VD 00 VO

10 (0 d C O ^D O 00 o in > •S -O «J OS o o 00 CN <3. V£) VO GO ;? = I - 00 VO GO VO OS 3 w 60 C O CO O T o ^ o vn CI3 « Si O T O rH o o "o £o £ O rH 00 VO B O CM r-i in >. s i2 '•*-< e« u ^ (J CL et p = '^ o in O

'> CO O 00 O 00 o in o. o n O O ^r to 1*9 VO CO (A c c • • 00 VD if) nil

JQ e u c itlll O u a cs

o in o t^ o in o <-^ e o n o o o rn o vo o lip in o o c o 5 o 2 o o en ^ en t^ in II II 95 S w <: CO

o r- o r- O 00 o m O CN o "^ o ^c o r- O VD IT) O rH O H (N CO o "^ O rH 1^ tn cn CO r- in r- in vD in « . .

o in O (O o ro O CTt o r- o n o in o in o n o o o in V 0\ 00 in 00 in VD "ST O rH -H o o r- lo VD in VD in \£> in vo in 00 VD III E r- IT) 00 m o o o o

in in °;^ s ^ VD 00 VD § CO U) s C C

o in o in o in o r-~ o m o o KO f-H o n o m o o o o ex <£> 00 in o CM in •I nil 03 l^ OD VD 2 •© o r- o o O VD O 00 CNJ 0\ rH 00 CM M <^ o in lO CM I m « I'l O CO CM •^ CO I e U O VD o r^ o r- o in O 00 o m o in O VD o o o ro o .-* o o o o VD O in o CM 00 CM in VD 00 -H in in m CO rH vo p' VD P- VD r- VD r- in OD VD r~ lO 00 VD E CM 00 VO rH n CM III rH o t-H t-t CA

o in O 00 o en O VD o n o in issi o o o O CO es 00 (N r* 1-1 in o m 00 VD 00 CO

O U3 O in o in o in O r^ O rn o o O 00 o <-* p- VD 00 00 CD VD VD VD p- VD 00 VD CO VD 00 VD 1 rH c:^ r- 00 ex mi rH CTv o 5r a in 1 Q CM CM rH in

1 Ml O CM o to o 00 o CT^ O o m o m o 1—1 o r- O [^ o o o 00 120 ."2 O lO V£) GO GO CTi = llll r-- in GO IC o 15 *- 2 i to it. O o « s H o U against three days old eggs. Table 15 data showed that two days old eggs in factors

a (solution), b (concentration) were highly significant while their interaction was

non significant.

For three days old eggs, the 20 percent concentration of chloroform (64.00

percent) flower extracts were better than methanol (71.00 percent) and water

(73.00 percent) flowers extracts. It was recorded that leaves extracts of petroleum

ether, chloroform, methanol and water at 20 percent concentration were found to

be superior and gave 74.00, 60.00, 74.00 and 75.00 percent survival of eggs

respectively. Table 15 other extracts also have little effect on the survival of three

days old eggs. However, solution and concentration showed highly significant in

Table 15 and 16 after three days old eggs.

Rao (1955, 1957) reported that the insecticidal properties of Bongainvillea

(flowers) against Sitophilius oryzae linn. Srinivasan and Subramanyam (1983)

reported B. spectibili contained characterized flavonoied glucosides of

isorhamrectin and querentin in the fresh flowers. Later, Joshi et at. (1984) reported the anti - inflammatory activity of alcoholic extracts of leaves of B. spectibili. However, Srivastava ei aL (1985) reported ih&juvenoid activity in the extracts of 5. glabra. In our experiments, the biological activity of petroleum ether and methanol flowers extracts could be explain on the presence of flavonoid glucosides of isorhamrectin and querrentin compounds. They might be

121 responsible for oviposition deterrent, survival of larvae and ovicidal activity

against C. auricilius.

Effects of Azadirachta indica of juss leaves extracts:

A. indica (Neem) (Syn. Melia azadirachta Linnaeus) is indigenous to India

and cultivated nearly all over the Persinsula and in Burma. The wood is bitter and

therefore, no insect will like to attack on it. The leaves are used to prevent the

ravages and white ant and other insects. The leaves extracts were evaluated against

C. auricilius and obtained results in different experiments.

Effect on oviposition:

Studies on the oviposition deterrency of extracts Table 17 revealed that the

number of eggs laid on untreated areas (control) were more than in all other

treatments. The average number of eggs 101.66 and 77.00 eggs were laid on

control and check strips/sectors respectively, when compared to methanol 15.00,

chloroform 21.00, petroleum ether 33.00 and Distt. water 42.00 extracts at 5

percent concentration. It was recorded from the data that order of effectiveness of

various extracts were as follows: methanol, extract, chloroform extract, petroleum

ether extract and Distt. water extracts at 10 percent concentration. Similar order of

effectiveness of extracts were found at 20 percent concentration. This clearly

revealed that methanol extract was most effective and reduced the oviposition on treated strips/sector when compared to other extracts.

It was found that viability of eggs were effected slightly which were laid on the treated strips/sectors. The lowest ovipsition index (0.08) was recorded at 20

122 e o M B «tf a j—r u e> ^v •it — e o i.U "Co S oS ai.1 O w -41^ <£U w w a •>< in

t. o e N

i i O OS £ •« sO

a'sUD ^M X « ^-' 09 M V U u 4t B O S* u <> 1n

00 CM eg 00 CD m in VD r-i O H 4^ 3 ot

^ «it — e in csj o m o 4g)s §: < IT ;i; m °^

c « §2 5? oi r~ CM rH T IK CM O CSI O ^ B '5 ° IS ?^3 -H 21 ,-! f^ ^S Ei Bg CM I !s -H 00 CTl OO -"T •o J ^ ^^ o 00 w E r~ 1X1 r- rH O •w 60 u iJ lU 1/3 V "O -w O e o. u 2 ^" u° r 4> — B < a in i- 12^

M E u 1 OS oa V «' u 3 < B U o - "- S u ft V h ^ I - o a. II u E £ < OS percent level of methanol extract and stood better than 10 percent (0.11) and 5

percent (0.14) concentrations of respective extracts. The oviposition index of

chloroform extract treated strips/sector at 20, 10 and 5 percent concentration gave

0.12,0.16 and 0.20 respectively. The other oviposition indexes control and check

(Table 17).

Table 17 revealed that average number of egg masses three in number on

all the treated strips/sectors, while 4-5 days in control and check. It was also found

that all the tested extract of ^. indica did not affect the average hatching periods of

eggs.

Effect on larval survival:

The toxicity of petroleum ether, chloroform, methanol and water extracts of

Azadirachta indica (leaves) to C. auricilius larvae is given in Table 18. The data

revealed that at 20 percent concentration, 24 hrs after treatment, methanol extract

gave the lowest survival (55.00 percent) of larvae and better than chloroform extract (62.00). The other tested extracts were not found to be significantly superior after 24 hrs exposure. The lower concentrations of extracts were not found to be effective. However, factor a (solvent) and factor b (concentration) and their interaction they were highly significant after 24 hrs exposure (Table 18).

After 48 hrs exposure, chloroform methanol extracts at 20 percent concentration

(55.00 and 52.33 percent) survival of larvae followed by petroleum ether (73.00 percent) and Distt. water extract (75.00). Similarly, survival of larvae (75.00 percent) was recorded at 10 percent concentration of water extract treated leaves. 124 e in rH 00 §§ s Ol CM r- in 00 2? ^ o ro o n o CD •^^|2 o o o §§ •— ^ R «< in o Q — * 2 00 2S

o a o ^i^n o a\,_ , o C,^M o KO^_ , ro _ o 0.0 o^ ^ © o O 00 o o r- o r- ro 0^0 o .—1 o ts S" i-^ iO U ^ o ^• 4» B -a 00 m m CO in no CM U3 r~ •T o a o :s u 00 y£> 00 >x> r- in VD in in ^ cr. 00 (T» -4-» C ii 4> CI > B V o O o o o c\ o

o o li) o o <_> III: in r- in r- in o ro 00 o o eg o o *- £-2SB CD ^O 00 VD CD V^D p- 1^ r^ in

o O .H o ro o ro o o in o r- o o o o o |Sll in iH CM ro in in o in o o o - * 2 CO »^ ^^ "21 ec t at o m O CM o vo ro ^ O 00 O 00 O 00 o o o r- ro ro O tH

1 ro 'T en ^ in o in ro CM ^ o 111 1 <^ in in T m 00 > § ;^ ^^ ^^ ^^ v> r- 00 VD tH n ro PI rH *lt < O^ 00 00 V£> oo vo CO VO in -^ CO s.*' u w

-H en CN r- CO in r- iH tH in tH CTl O O ' o E •^ o ro O CTt O I o iH iH tH tH ro CM nil ss -*2i ec * to _,^ _^ ^^ ^^ __^ CA * C O lO in r- o en O 00 O CNJ in VD CM ^ O tX) in r^ in (J\ CM O^ M> 00 in a\ r- 1 1 00 ^D 00 \0 vD in M 4* -^ k. L. •— — W ••rf S*! •^ "^ ^^ ^-^ a ~ > 2 ss m en CN 00 VD r- CM 3 o CTl o 00 -H r~ 60 eg 1 C ro CM 'J' ro 00 r^ w 1 •^ C4 u 08 ^ o vo en ^S *"" ^ O CM ' u JS 4> C ^ S u ss s O. -H CTl ro VD O) CM E o o CO 00 r- b u O CJl o r- O VD o ^ O T ^ o ro O t-H o en O 00 O 00

in r- 1-H ^ CM f-t p- ^ 1^ iH III ^ <^ 00 '^ 00 'X) vD in en CO a\ 00 U w ocs . o in o in * M25 o *x> o "x* §: §: .s lill 2 .«-^«s CO Q .A M oa

ii \nt o •- 0 'S U S a> C o k. ^2|-S II H 1 while it was (80.00 percent) on chloroform extract treated leaves at 10 percent concentration. However, factor b (concentration) showed highly significant after

48 hrs exposure.

After 72 hrs exposures, chloroform and methanol extracts proved to be significantly the best extracts amongst the tested extracts showed (52.33 percent) at 20 percent where as petroleum ether and D. extracts stood moderate in their activity at 20 percent concentration (73.00 and 75.00 percent) at par with control and check. However, after 72 hrs factor a and b (solvent and concentration) showed highly significant (Table 18).

Pandey et aL (1998) reported field experiments were conducted India to determine the efficacy of plant products as insecticides for the control of S. excerptalis. The lowest number of pests (6.35 & 6.17%) was observed following treatments with Eucalyptus rostrata (3%) compared to the untreated control (16.88 and 15.77%) respectively followed by Azadirachta indica and E. rostrata (2% solution).

Sahayraj et aL (1998) reported a laboratory study was carried out to evaluate the effect of water extracts of four plants leaves in insect pest control.

Various concentrations of the extracts (0.5, 1, 2, 4 and 6%) were used against last instar larvae of the groundnut pest Spodoptera litura. Calotropis gigantea was found to be the most toxic plant product followed by vitex negundo, A. indica and

P. pinnata.

126 Patel et ai (1993) tested extracts of Neem, Annona squamosa momordica charantina, Lantana camara, P. glabra, Diospyros cordifolia and Garlic against

Amsacta morei in field cages in Gujrat, India. Five percent suspension sprays of neem seed and leaf, custard apple seed and leaf, bitter gourd seed, Lantana leaf,

Kanzi seed, dhaki seed and garlic bulb have been found considerably effective against 2"** instar larvae of A. moorei. However, A. indica seed was found significantly superior to rest of the treatments by giving 92.22 percent mortality followed by Neem leaf extract, which gave 72.22 percent larval mortality. The custard seed extract gave 36.67 percent mortality. The rest of the extracts gave larval mortality in the range of 46.67 to 54.44 percent.

Bhatnagar (1995) tested the toxic effects of plant extracts on eggs of Chilo partellus, a pest of maize. Several semi-solid crude plant metabolite were isolated by Soxhlet-sequential extraction and bioassays against 3 day old eggs of Chilo partellus under laboratory conditions. Petroleum ether fractions of A. squamosa and A. indica were the most toxic and these completely inhibited hatching. The

LC50 values of these extracts were 0.03545 and 0.03588, respectively.

Ovicidal action:

For one day old eggs, it was observed from Table 19 that the treatments like, petroleum ether and chloroform extract at 10 and 20 percent concentrations were found to be significantly superior and gave 68.00, 68.00 and 65.00, 65.00 percents survival of eggs respectively. While other extracts were found to be least

127 o r> in in o o o O .-1 CM VD CN U-: o o o^ in o 00 VO r- ON r- in VI3 LT)

o in o m o en O .-I v:-> lo o o o o o o O 00 o a\ o m to o in o o ^ r- »X) u' in e llfl 00 \0 o ••* mm* • 9i O rH O rH o vo o r^ . 1 O u O 00 O 00 o r- o r- C *' o \o O U3 in m o o 111 o> •Si w M r- in r- in >i) in vo in 1.1 T o o OJ U o o ^ o n o n o r- E ^ o ^ o o o o I J OJ II II 1. o r- O ro in o in o o o < « o CD \D S5 ^^ , , ^^ VI o r~ iD in O rH O ,W^ O V.^D o r^^^ o ,r^- !."> «—T . O (,N^ o _o 4^ O •<3' ID (Ti m en O 00 o r- o r- O CO k> .H o a\ O in n o o in r* IN "X* m ^T •cr lO Q 25i| r- in vo in w> in in ^ in rr a\ [^

u> o 00 CO O fH -H O r~ 00 o in E en vo 00 ro u

O iH o m o m o .-t O r-l § •5^|S o a\ o ^o o o o o\ C4 ^ o m in o m 00 00 VO 00 »X> r- in M Q - * at U)

2 o in o m O VD >> 00 tM 00 0\ O t-t s*; CM O, J f- lO r- in r- in 00 ^ vD in in in 00 VD -H Ln 1X1 O E 00 CM r~ fa] o in O rH o ^o O O tH V es o n o r- o r^ O "•a* o^ n 00 00 cn |ls| r- in r- in GO VD o en E o ^ o ^ O 0^ o in o in M in f>j O t-H O 00 01 O 00 O 00 00 *X> t^ IX> *^

I I" O o o o C\ o ro o ro o ro o in O in o r- o «X) o KO o \D o o o CD o 00 c(^ s? £ V tS L. Q S X 00 VO 00 U) 00 ID cc U3 r- • , ^ " ^ *~^ Q ro CM ^T n u J U „^ o ,m_ o r,_o . o r--o^ o i,~~.n Cl r—~o . o in o i.-n^ !^ O «i> o vo o o o o o o 00 o 00 »- "o ^ « e •; o m o ro o ro 00 CM in o 00 m GO r^ \D vo l£> I -H . •a" 00 ^T n cr, 1^ 'S F CM VO rH CM cs e £f o ^ u rH• rH rH n • 6 _ u o m o ro o in o \£> O \D o in O in £i i/> o u> o u? o ro o r- o r- o 00 O 00 ?» Sis ^ VD o fO r^ i-H in in ro GO a\ 00 vo in \o in oo '^ 00 «X) o

1oi l * * * (0 in I o ro o ro o ro o '^ o tX) o in o in (M * + * * C C O £ § o o o o o o o r- o r- o 00 o 00 ^^ in o in o in o 00 in in ro 00 CTi 00 ^o in *x> in oo «X) oo \£> == z < |||r.' H o e o o |i|^o s JI U effective. However, data showed solution and concentrations were highly

significant (Table 19).

For two days old eggs, it was recorded that the eggs were comparatively

more susceptible to petroleum ether and chloroform extracts then methanol and

water extracts. However, factor showed highly significant between solution,

concentration and their interaction (Table 19).

For three day old eggs, the petroleum ether extract at 8, 10 and 20 percent

concentrations were found to be the (60.00, 55.00 and 52.00 percent) survival of

eggs, while the chloroform extract at the similar concentrations gave 75.00, 60.00

and 54.00 percent survival of eggs respectively. The other tested extracts also

proved to be effective but their effects were too slow. However, the factors a

(solution), b (concentration) and their interaction showed highly significant at

Three days old eggs (Table 19).

Warthen (1979) reported that extract of neem leaf mainly contains

meliantriol, Azadirachtin and Salanin. The leaves of neem also contains nimbin,

nimbinin, 6- desacetylnimbinene, nimbandiol, nimbolide and qnerectin.

Azadirachtin isolated neem leaves and seeds have repellent effect. It is possible

that repellent activity of methanol and chloroform extracts to the female moth may

be due to the high level of Azadirachtin and other toxic compounds. It was

observed that deterrent effect on egg laying gradually increased with increased in the concentration of extracts from 5 to 20 percents and this can be attributed the

129 presence of increase level ot principal components of Azadirachtin at each level.

Adverse effects on oviposition by the application of neem products had been reported in case of 5. litura (Joshi and Sitaramaiah, 1979); N. lugens (Saxena et ai 1979) and£. variastis (Steets and Schmutterer, 1975).

Azadirachtin, a strong feeding deterrent for Spodoptera gregaria (forsk) is isolated from the neem leaves and seeds. Gill and Lewis, 1971. This compound had been considered to be potential value against various crop pests. Sankaran et ai. (1986) reported that neem seed kernel extracts was effective against sorghum insect pests, such as maize stem borer, Chilo partellus (Swinhoe), army worm

Mythimna separata (Walker) and the ear head bug. Calocoris angustatus Let. and by the application of extract, there was an increased in yield of sorghum by 25-30 percent Gujar and Mehrotra (1983) reported the juvenile hormone effects on C. partellus (larvae).

Pandey, K.P. et aL (1998) reported field experiments to determine the efficacy of plant products as insecticide for the control of S. excerptalis. The lowest number of pests 6.35 and (6.17%) was observed following treatment with

Eucalyptus rostrata (3%) compared to the untreated control (16.88 and 15.77%) during 1989-90 and 1990-91, respectively, followed by Azadirachta indica and E. rostrata (2% solution).

Sahayaraj, K. et al. (1998) reported in a laboratory study and evaluated the effects of water extracts of four plant leaves in insect pest control. Various

130 concentrations, of the extracts (8.5, 1, 2, 4 and 6%) were used against last instar larvae of the groundnut pest Spodoptera litura. Calotropis gigantean was found to be the most toxic plant product followed by Vitex negundo. Azadirachta indica and Pongamia glabra {P. pinnata).

However, neem leaf and seed extracts were affected the oviposition activity of many other insects (Hellpap and Mercado, 1986). Data revealed that three days old eggs of C auricilius was the most susceptible, when compared to two days and one day old eggs. Petroleum ether extract was found to be the most effective against three days old eggs.

Bhatnagar (1995) tested the toxic effect of plant extracts on eggs of Chilo partellus, a pest of maize, Several semi - solid crude plant metabolites were isolated by soyhlet - sequential extraction and bioassayed against 3 day old eggs of Chilo partellus under laboratory condition. Petroleum ether fractions of Annona squamosa and A. indica were the most toxic and these completely inhibited hatching. The LC50 values of these extracts were 0.03545 and 0.03588, respectively. Observation of survival data showed that the lowest survival (55.00 percent) was recorded at 20 percent concentration of methanol extract followed by

(62.00 percent) of chloroform extract treated leaves at 24 hrs after treatment. The higher toxicity of methanol and chloroform extracts were reduced and it may be due to the presence of high amount of azadirachtin in the extracts.

131 Effects oiMaurya koenigii (L. sporenge) leaves extracts:

Sweet neem, M. koenigii is a larvae shrub or small tree, cultivated in Tamil

Nadu, Mahrashtra and northern India. Leaves of this plant are used for flavouring

curries. The leaves extracts were evaluated against C. auricilius and obtained results in different experiments.

Effect on oviposition:

Studies on the oviposition deterrency of extracts Table 20 revealed that the number of eggs laid on the untreated areas (control) were more than in all other treatments. The average number of eggs 85.00 and 77.00 were laid on control and check strips/sectors respectively when compared to petroleum ether extract

(10.66), methanol extract (12.00), chloroform extract (13.00) and water 37.00 treated strips/sector at 5 percent concentration recorded. Similar orders of effectiveness of each extract were observed at 10 and 20 percent concentrations of respective extracts treated strips/sectors. The data clearly revealed that chloroform and methanol ether extract had the highest oviposition deterrent activity amongst the tested extracts followed by petroleum ether extracts and Distt. water extracts.

It was found that viability of eggs on the treated strips/sectors were slightly affected. This clearly showed that these extracts were only repelled the female from the treated surface but did not affect the viability of eggs. The data revealed that 20 percent concentration of chloroform extract gave lowest oviposition index

(0.04) followed by 20 percent concentration of petroleum ether (0.05) and methanol extract (0.05). The oviposition indexes of other treated strips/sector also

132 c: o ec o N .£ a f L. C» '^ •rf s > O H M »- "O cS? III t I uo ^ < in V 'S

U e o •o _o M w •CgI (A 41^

O ii H a> M fO sv-> M M U e« V «ri £ u e ^ o < >e? V m

ID iH tn r-H o ro B o O CM O (N) o rsi C^J CD IT) O II II N X _o O O O O o o o o O iH < OQ « «e^g u e 1 e .-t 00 w 1 O 1O ?Sx' i-l u o u ^Dr Q. t; 1/5 IT) I^ *^ ? •• 00 CNl O TH CT^ ^ IT) O OS . . in 1-4 CO Q CM O CM O ^ o O O o o o o o o U " ~~'

u s "? -H cri <^ o (X3 CM l£> "S E CTi i£l >-l 2 Ssi u •** o o o O O 1•fc* a R e ~— —* — f _g o Sfi. ^M o ^ M o in o r- «U o O 00 Uec N in o ~ •*C* t-t t-H <» t-t ^^ •» o M + + (n * * CA • * + c + + I ^ 8^ O I 1 VD ^ r-* C, u1 a> O rH § > o ro < in

m o

OQ 4c> •- • »» CO 3 o (U ^ — SS Io. *< 1.1^ u J « s c H B ^ o II( I lis •< es U ^ Of showed superiority over control but their ratio of eggs were too high, when

compared to control (Table 20).

The average number of eggs masses was almost 2.0 on all the treated

strips/sectors except in Distt. water extract, where it was 3.0 in number when

compared to control (4-5). It was also recorded that all the tested extracts were

slightly affect the average hatching period (4-6 days) of eggs in compare to control

(3 days).

Effect on larva survival:

The toxicity of different extracts was evaluated on 2 to 3 days old larvae

after 24, 48 and 72 hrs using foliar application method. The observations (Table

21) revealed that all the tested extracts of petroleum ether, chloroform, methanol

and distilled water were not found to be effective to reduced the survival of larvae

but some how they were more or less superior over control. Maximum results

showed after 72 hrs exposure at petroleum ether extract and methanol extract

(70.00 percent) at 20 percent concentration. However, Table 21 data showed that

factors a (solvent) b (concentration) and their interactions were highly significant

at 24, 48 and 72 hrs exposure.

Ovicidal action:

The toxicity of extracts were evaluated against one - two and three days old

eggs 24 hrs after treatment. Data revealed that extracts were slightly superior over control (Table 22).

134 o^ o^ incn inoo min r^*^ o*-* on or^ r^cn r-o (MO .O ,O 'T'D (Nin r^o^ t-tiD, \£>.-i So oO a\r-

or- org ofM 00 O--H S^D SO oy3 OU3 o'x* OU3 or- .0 .0 loco CNin fsjm o--* rom So So mi c^^^ o^r- a\r-

00 00 o

O _ U Q o^ OT o^ oa\ .0 ,0 c g = £:; OTH O.H

0 0 0 CM 0 rH 0 l^ 0 a% 0 10 0 r- 0 en 0 0 0 r- °§ §: in i^ eg 'T (N 00 0 "^ o III 00 VD r^ in r- in ss "21 Wl I~ CM vo in

0 (M 0 CM in CM in i^ 0 0 C8 0 ro 0 r- r- 00 CM '=r in vo °g CM m 00 0 CM in CO CN CD r- 00 to Is(7. ;::; -H •^ CM CO •3' E VD VD CM CM h u or- oin ooi o

I 00 00 ocM or~ on So So om ocn o M otp- o ovo 000 on OCT! .0 .0 m ro n ro Ol •^ cn iri ^ 0 00 0 r- O OrH OiH ooa\ ini^

0 0 0 CM 0 <-t 0 tn 0 r- _ 0

0 0 0 0 in a\ in 'T 0 r-i 0 (N 0 0 0 0 in u> r- kO r^ 00 in in 0 as 0 0 0 0 ^3* r^ CM 'a' rH r^ as r- 00 r- 0^0 0,—0 . ro r.—^ . 0 0 0 0 0 CM 0 cn 0 cn 0 0 V _« ,_ ^-^ 0 , 0 ,,_^ in 0 T-H f-H CO R 0 in 0 in r- in 0 0 0 W5 rH •-{ (M CM 0 0 (J^^ ^ 00 >JD CJl a M a» r- r- cn r- r- \o cn u

0 u. 0 CM 0 CM 0 Csj 0 a^ 0 >-i 0 0 -H in 00 C\l i =" VO V£> 0 0 y 0 0 0 \o 0 cn 0 as 0 0 E in in 0 }; 2 ? 0 i-t 0 r^ 0 <-i in r- CM rr 0 0 0 0 u r-l *"" 0 0 0 0 O b h r- Cs r~ cn r- oo i-H m as '^ •—• •—• U u "-' —- —- ^^ —' c

0 0 0 0 0 CM 0 1—1 0 in 0 in 0 0 0 0 CZ5 0 in 0 r- 0 cn 0 m 0 cn 0 0 0 0 c^ in r~ CM cn CNJ

CC I - 2 --- CQ a» 0 0 0 c ^0 0 0 still 0 ^ u c o in n o 00 0* r- rH in o S 03 ^ 00 ^

1 L. u •*: "o « es

2 o in ^« "S a" O CO en "Sou B 4) B *; IX) O 03 tn 00 tji >, 00 VD 00 -X) © R I. e t; U I «< o F b o _ w .= 4) J3 i: S S< 5•s =u f- IX) O 00 CJl 00 CT* o o 00 ^O 00 ^O (yj (J u u II II < oa 2 S| S H s -B u s? •n CD m O CM <£-2wg «< in (N CM CM es a '-' T—1 o in (N o n o o en o in U es o \x> in O 00 v f-t ^ on 00 0\ 00 VO % 00 V£> 00 ^ "H ixt ro 00 ^ E '^ •^ r- in b] s ^ o • 1 h< W ^o IX) o en S ° •5 -O » e» »X> 00 o po Ml o n o ro U O ~ ^ S 03 vx> CO '•D a: "^ 4> oti u) in Uu 5« C C TJ 1 f. es u o ett O 5 o 2 o « e -s 'S S 5^ IH^ I n in r-) j-f o o n i^ en in r- 00 00 VD ^ in 00 ^£> 00 VO >^ r- r- U

O iH o m o m o in o r- o

o ocTs or^ om mo^ IDI-H e 0"«T iDlD tnOO tNiT) C^JC7^ ei CO in (0 to V C C 00 VO u

X o

00 "X) > lifl ST 3 in vc ro CD o a\ O CT) T CO 2 o ^ O ^r c cs o "o Q OO \£) 00 «) U B « .2 a. u O (NJ -H ill o ^ E X) __ • • SQ oj < o o U It was found that only higher concentration of extracts were able to slightly

reduce the viability of eggs, otherwise lower concentrations of extracts did not

have any effect on the viability of eggs in comparison to control. Similarly after

three days old eggs data showed maximum survival of eggs was petroleum ether

extract and methanol extract (72.00 and 72.00 percent) at 20 percent concentration

followed by chloroform extract and Distt. water extract 73.00 percent. (Table 22).

Chopra et al. (1980) reported that M koengi (leaves) contain essential oil

and glucoside koeningin. It was possible that repellent activity of chloroform,

methanol and petroleum ether extracts to female moth might be due to the high

level of essential oils and glucoside "Koeinigin" in the extracts. It was observed that deterrent effect on oviposition increased gradually with increased extracts concentration from 5 to 20 percents and this cane be attributed to he presence of high amount of principle components in the extracts. Observations on survival and ovicidal action did not show any promising results. On the basis of above discussion, it was concluded that the extracts of M koengi (leaves) could be used as repellent/deterrent against C. auricilins.

Effect of Cannabis sativa Linn. leaves extracts:

Cannabis sativa commonly known as Bhang is an annual herb, cultivated in subtropical region. The powders of leaves are used in storage as protectant besides that it has additional economic values. The leaves extracts were evaluated against

C. auricilius and obtained results are described.

137 Effect on oviposition:

Studies on the oviposition deterrency of extracts Table 23 revealed that the number of eggs were laid on the untreated strips/sectors comparatively more than in all other treatments. The average number of eggs 116.0 and 85.0 were laid on control and check strips/sectors respectively, when compare to methanol (26.00),

Distt. water (30.00), chloroform (31.00) and petroleum ether extract (38.00) at 5 percent concentration. Similar orders of effectiveness of each extracts were recorded at 10 and 20 percent concentrations. The data clearly revealed that all the extracts were more or less equally effective. It was found that viability of eggs on treated strips/sectors were slightly effected. This clearly showed that these extract were only repelled the female from oviposition site and did not have any effect on the viability of eggs (Table 23).

Data revealed that 20 percent concentration of chloroform extract gave lowest oviposition index (0.14) followed by methanol extract (0.17) and petroleum ether and Distt. water extract (0.20) other extracts also showed superiority over control (Table 23).

The average number of egg mass was 4.0 on treated strips/sectors with petroleum ether and chloroform extract, while it varied 2 to 3 on methanol extracts and Distt. water treated strips/sectors, when compared to control the 5.0 eggs mass. It was also found that all the extracts did not effect the average hatching period of eggs.

138 c _o o on CM _c 08 !c u u ^ 's O I' /-> f .5 C3 2f O..E 12 u o > in < u 08 u M 0> B w o _o o «•* i» 08 •£ <« 1. £ cS o i E H « U M M Of w w 08 u in > M ** < 4*

M o m ^ o o m s ** o e CM u u o o B > OS u '*^ ;^ •o 08 •« e 1. 01 II II « LT) «T JS .o u Vi o o o o M 08 o §?^ M u o 01 S3 -I 3 (» ^ 3 o L. k CN V o : M + + •fi u §- §: §; E u 3 ?22 Ss OS e k. X O I ec ~ o ~ 03 L. in V > < s5 s 1 O iy> ^T ro —1 no I S- hs ^rf ^D i-i 00 >-i LTI ro 08 u o § k. g; rJ •Si 08 CN l_ = U g o00r -H O r- 'J' a? r-~ (—1 •^^ cn ^D VO •^ -O tH ec y F e -e u u o o o tj -"• O §^ u C/3 V U O MS w H O. e 08 — 08 w ° J t- u u t/5 > X V u M + —•f . fO +-— . -* +-— , E < — o + + -« + c (/3 •' c s m §S Z cs c

rt^ u O CO 5 u < CQ 08 i •o 1 < H 9 u. Ell 08 := u c S < •— 01 i 0) o B .2 S C U E u Effect on larval survival:

The toxicity of different extracts were evaluated against 2 to 3 days old larvae after 24, 48 and 72 hrs using foliar application of extracts. Table 24 data revealed that all the tested concentrations of petroleum ether, chloroform and

Distt. water extracts were not found to be effective reduce the survival of larvae except 20 percent concentration of methanol extract, which reduced the survival of larvae upto 57.00 percent after 24 hrs exposure and it was given similar survival of larvae after 48 and 72 hrs exposure. The other extracts were slightly superior over control, but did not effectively reduce the larval population. However, factors a

(solvent), b (concentration) and their interaction showed highly significant at 24,

48, 72 hrs (Table 24). Ovicidal action:

The bioefficacy of different extracts were evaluated against one, two and three days old eggs after 24 hrs exposure. Table 25 data revealed that all the extracts were more or less superior over control in reducing the survival of eggs.

Only higher concentration of extracts was able to reduced the survival of eggs substantially. It was found that 20 percent concentration of chloroform extract was reduced survival of three days old eggs upto 69.00 percent followed by petroleum ether (70.00) methanol (73.00) and Distt. water (74.00) extracts (Table 25).

Chopra et al. (1942) recommended the phormological studies in man for about the activity of chemical constituent obtained fi-om C. sativa. The active

140 1 K£, CO 00 "X-

^ O

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0 CM 0 0 0 0 in 0 in 0 iE|l 0 CM 0 0 0 0 0 0 0 °§ -H 00 tyi •a' 00 ^J- tT) CN in in r- in CM CO CM CO 00 m E en 00 in in

\n CO 10 CO 0 in 00 in in in CM CM ro en p- CO CM CM VD

in

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o ro o ro O (N o in V£> CO O T o ro o ^ a o m o m O r-l o r^ in r- in mi CD ^O CD ^O ._ «» O fO O (M O CM O fsi O (N o m o a-. O ^T O T o r^- tn r^^ in t^ in »x> tn CTt r~ Ol r- o IT) 00 CD Ol a u o ro o fO o O tH o tH 03 vt> r^ VO vo r^~ in r-" in CTt r^ CTt r^ l^il r- -H rH VO fH 00 E CTl VO CM 00 Ul Wl O O tH O O o m r^ in ai o tH o - o X O X 9 U1 vo r- in r- X o r~ in ^ o vo o vo 1-t V 00 CM r^ f-1 lO o CM X o tH o r-* 4* CD vo r- U3 r^ vo [^ lO T^ in (Tt r^ CTt r~

ei to (0 to to C C o ^ o V£> o in o m O r~ o CM O Cs) .s ••S -a « « o ^ o rH o ^ o o o '-0 o VO O vo vo f-H o ro X CM \o o o tH O tH Q^D VD CO v^c X ^o r- iO 1^ vo CTt I^ a\ r^ MD w

O t-H o fO o in o in o fO O o o o "3 O o r^ o o o o o o O 00 o X > v> o^^ «T a\ (N X CM X CM in o O tH o fH ^^ ^^ ^^ r^ in r~ VD in CM 03 U> r- IC p- lO r- i^ p- ic CTt r~ CTl r- sV«I >. «4 in CM o VD fH CO ** e: i'l a • 9 fH* fH• CM• tH> •«r CO ^B e n o lO o in o ro o m o ID O CTt o Ol u '« o n o ro o o o o o r-^ O lO o Ml r- t-t r- tH m o in o Oi \o O TH o tH p* >x> r^ U3 kO vo «3 in CTl r~ Ol p- OS r- r- -H IT) ^J» CO 00 vo i^ III E in 'J' r~ in ^ tH o O o o tH tH I o CT^ o in o in o tH o CTt O CM o CM M o IX> o o o o o (^ o r^ O vo o vo n in 00 CM X rM ro X o vc O tH o tH ao u> r- vo r* vo r^ in [^ in CTl r^ CTl r^ to to c c o iT) GO o in o r^ KO CM o in fO in vo in •*^ rM en in in in ro t-* ro o ro ro X vo X n ^ f-t ro CTl n X CM VD o *r tj\ n CTt .2 es I 02 >^ X VD (^ y? t^ u> r- tx) X vo X u •^^ -^ —- •^ ^- -^ — ^^ X fH ^o vo m 1 V o Oi o o t~ n o r^ fO m l£> vo X en 4l!S o « o 0^ o fH lO o lO ro X = O X in X T o a\ ro OD o ro as o o^ C7 X tx) X V£> X ^l£> r- vo t^ vo f^ vo I^ vo ^^ , . ^^ > s = ll sW«1 ^ CTt O .H O CM VD 00 in in o o 00 n CM tH CO CM [~ in o rH o ro o ro o ro o in o in o m ' o X lO X «) [^ lO X vo X vo c •D 4> -H f^ p- CO 00 u B 1 E CTl VD CM CD o ro o ro o ro o in o in o in o in ii w O O tH O o vu o o lO o ro o ro o X o X (/I CM \2. o «) rr\ o n o ro o ro r^ tH o ro o X o X c C ^2 m in X rM X f\j VO O CTt X CTl• X CTl • • Ilii X VD f~ ^o r- vo r^ IX} (^^ tn X VO X vo «s 1 a> a ^ 0« OS w it U "b O B «s •"t 00 o e *; 5 *' o B o o w S Q. £ g .2 u •<: u principle of cannabis plant were contained in its resins. The principle constituents

of resin was a cannabinol.

The average number of eggs observed on treated strips/sector decreased as

the concentration of extract were increased from 5.0 to 2.0 percents. This was

probably due to detterent effect of cannabinol present in the extracts.

The data recorded on larval survival showed that lowest survival (56.00

percent) was recorded at 20 percent concentration of methanol extract after 72 hrs,

while other extracts, also showed more or less superiority over control but were

not able to reduce the larval survival substantially.

Deshmukh et aL (1979) reported that C. sativa did not support the larval

development of Diecrisia obliqua walker. The methanol extract was found to be

the most toxic amongst the tested extract and it might be due to presence of higher

amount of camiabinol in the extract, which actually affect the larval survival.

The data on ovicidal activity revealed that only higher concentration of

chloroform extract were able to reduce the survival of three days old eggs

followed by petroleum ether, methanol and water extracts. It was clear from the data that chloroform extract of C. sativa was the most effective amongst the tested extracts and its contributes maximum ovicidal activity. Effect of Calotropisprocera (wild) leaves extracts:-

Calotropis procera commonly Madar or Akh, is a perennial shrub or subshnib plant. It is commonly found in Tropical and Semiarid areas. The extracts

143 were evaluated on C. auricilius and obtained results in different experiments are

described.

Effect on oviposition:

Studies on the oviposition deterrency of extracts of C. procera (Table 26)

revealed that the number of eggs laid on untreated areas (control) were more than

in all other treatments. It is well evident that petroleum ether extract was found to

be the most potent and completely deterred the female from treated strips/sectors

(Table 26). Therefore the gravid female was not able to deposite their eggs on

petroleum ether extract treated strips/sector at all the tested concentrations of

extract. The methanol extract was the second best and followed by chloroform and

Distt. water extracts.

It was found that viability of eggs, which were laid on treated strips/sectors more or less affected by respective extracts. Perusal of Table 26 revealed that 20 percent concentration of methanol extract gave oviposition index (0.18) which stood better than amongst chloroform and water extracts, while it remained zero at all the concentrations of petroleum ether extract.

The data showed that average number of egg masses varied from 1.3 to 3 on treated strips/sectors al all the levels of extract, in compare to (4 to 5) control. It was also found that average hatching period of eggs were slightly effected, which were deposited on treated areas when compared to control (Table 26).

Effect on larval survival:

The toxicity of petroleum ether, chloroform, methanol and water extracts of

144 1 s?

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(J o o o n II o o

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o o ° 1-1 §! •s o r~ O o , o u vo >„ r- o o o o e

o o o i^ § §! 44 B ^'2. IX) ^ r- c. (0 CO I V c c w o o o ; E o r^ §: 3 u B es I V M M £ > vo C «>

•ft o r- LT) CM f^ .-( I ** CM ^ m r-< CD CO eg . . SC2 n ~ -i 3 Q (N O .-to U '- - Si ^-. is ^'2 I exi © •—' V3 o o o o -- o 11u §: a. e u u -.C2 u 11 OB u E §: c s Si -5 - :^ 145 z; (8 a.

c i5 u 03 S c " ucs. H B C^ E 5 ee I? I. c 2 O- « III c H u a o r- o o~t in f) in m

O CN »i) m o in O ^ vo r- O 00 o «M^ isll >^ CO u <=>"*£ § 03 ID ^rf 3 •2 a O !: « Q. 1 -^^ i a M es u O

S? o o O o a^ o in o ^ o ^ «< ix> •^ CSI CM O T R -< o ro CD ro 00 ro o Z £ ^ (Nl CM n. CO VD 00 VD CTi OO Q "-I U u U '

s o B it o CT\ t^ (TV t^ 00 o G\ tn CO m o\ r^ r^ .H 3 o ~ * 2 S bd « TH• CM CM CM. 'JT in 00 n u i u u o a o o CM o rvi o V o o o o r- |e| o ^«r o 00 o VO o o ('S^' o o CM < ^ o -H tH TP on ro in r^ o rH 'T VO o ro o r- o Ol i^ OO VO GO VO o tn tn GO r^ tn > CTl CD a\ tH E g-s^ (~ fad

o CT-. o ro o in o rM O [^ o o o r- e o in o o o o T O o o CM ^ (^ o lill (N ro VQ 00 o ro T-l r^ O o o o r- o «£-2«S2

o tn CO o IC in m r^ Ol r^ 00 VO tH m tn CD in iH VO o Q ~ ^ S VO a-\ VO S 3 i ^ (M CM Urn « . O .2 a tH t-( a. .^^ o o (J X 01 U o r- o cn o ai o cr\ o a -2 1^ o in r- o ^ in t^ in r^ o o o o 00 t- tn t^ CO VO 00 VO tn a x; a\ a\ tH tH en c c o o in o lO o r- o r- o in o o o r^ 55 s ^ S Sl o ID o VO o o o o ro o o CM o. ^ o 1?6 CNJ ro m o o ro CM OO r-t ,H o o 00 in c • • CT^ r^ GO 00 VO in VO in tn tn 00 2-25| r- r^ tH B Q en CQ 4-* a JO a ^r , - " ^ • •< « •2 «J -S a? V : 1 ? w O a ^u E 1 M •* 90 o o w a H « g: •• o a f 08 r 1. X a o V u o k. »» 5 -c u U H < C. procera on 3 to 4 days old larvae was given in Table 27. The data revealed that

petroleum ether extract gave lowest survival of larvae (60.00 percent) after 72 hrs

exposure at 20 percent concentration foliar treatments of extracts.

It was found that other extracts did not have the capacity to substaintly

reduce the survival of larvae when compared to control.

Ovicidal action:

The bioefficacy of different extracts of C. procera were evaluated against

one, two and three days old eggs of C. auricilius after 24 hrs exposure. Perusal of

Table 28 revealed that all the teste extracts were superior over control. The

petroleum ether extract was found to be the most effective and reduced the

survival of three days old eggs (70.00 percent) and followed by chloroform,

methanol and Distt. water extracts (71.00, 71.00 and 74.00 percent) at 20 percent concentration. The survival of three days old eggs were observed to be decreased as the concentration of extract were increased from 2 to 20 percents. It was observed that the three days and two days old eggs were more susceptible as compared to one-day-old eggs. This may be explained as being due to the inhibiting influence on the chemicals on vital enzymes, which were needed at the late stage of embryomic development of eggs (Table 28).

Rao, (1955, 1957) reported that petals and corolla of Calotropis juncea width posses insecticidal properties against Sitophiliis oryzae Linn. The active principle of C. procera plant is alkaloids. The deterrent, antifeedant and insecticidal activity of petroleum ether extract might probably to the presence of

147 in fO 1 CN in

o CM o in o o r- o o o o m o o I O T o 00 pll o m r- in o en 00 en V> O - » X 00 "Xl r- «X) in in 00 GO VD « .2 5 g4> •o 1 •^ « w KX> IX) o (N o CM o CM o o o o I c •os .C -2 « VO GO CO O o o o CO o oo tfl Sou o o o o >1 u s •" iT) O in o 00 en 00 en r- lo ^ in 1^ >X> in 00 00 ^ II II 5 S U r- < OS

V I. 1 ^^ £ O y o r^ o o o CM o CM o o o o m ro ro OD Cr. r- cr* o «^ o •ST 00 O 00 O ^ •^ GO H o o o o 'a ro r~ f-H r-i 00 en 00 en o m o m 00 CNJ r-{ CM .H iD m GO *x) in in 00 •X) CO VO Q III GO \D "•"' •^•^ u**" w y ^^

O VD o CM O IT) o o o o o CO o O o o 00 O 00 ^ESI o -H rH O ^ VD cn VD 00 m 1-H ^ IT) o o ID 00 00 a\ E r- in 00 ^ r- IT) r- IT) in 00 vo CO V£> 2^i| r- o o

O CM i-H 03 f-( o r^ o m m o CM en o o 00 o n in CM o CM o CM in CO O GO U> r- in oo U3 CO r^ (0 to in in 1 C C c c

s O t- vc vo O CO o vo o m vo 00 vo 00 o vo O ^ o o O 00 Isll O ro c CA Q — ^ g 00 VD c^ in Mec 0<"$• at Sf o o r- o r- o vo o ro o p- o rH o vo 5? , U 1 o 'a* o ^ o ^ o o o ro o r- o vo If) vc rH 00 vo M 1^1 CN VO CT^ rH a\ CM > V B '*^ o m o n r- .H in o ^

o i-t o r~ o r^ o r- vo VD o vo o vo o en o r-t o ^ o ^ vo GO o ^ o vo CM ^ rH T o fO o CO ^ o ~ * 2 n C^ rH CM CM in ^R 1 n CM rH n CM VD ^ V 1 -w so ' " •o OS ^ o ^ o 1^ vo vo VD VO o VO o o o o u ^ o ^ o "T vo 00 VD 03 o "a* o 00 o 00 c o ^ o w W3 ^ vo o m 'B- 1^ tH 00 o ro cn in o CD Ol CO cn• 00 V^D ^ cn III vo 00 00 vo r- in r- vo oo vo 00 vo U u '3 c oo CO m c5 n m o t-( o r-4 o r- o vo o o o o o. ^E|S m CM o en o cn o V o o 00 o CD a c O •^ c 00 O CM ^ CM T o en 1^ .H 00

w BQ 00 «•» Ss 4> ^ 'o c (J E c 2 S^

clear form the data that petroleum ether extract had good deterrent, repellent,

ovicidal and insecticidal activity against C auricilius, which may be exploited and

utilized for further studies.

Effect of Thuja compacta leaves extracts:-

Thuja compacta leaves commonly knowns Morpankhi is a perennial conifer tree and commonly found in temperate areas. The essential oils of this plant posses some pest control values besides that it has additional medicinal values. The various leaves extract were evaluated against C. auricilius and obtained results in different experiments.

Effect on Oviposition:

Studies on the oviposition deterrence of extracts Table 29 revealed that the numbers of eggs laid on untreated areas (control) were significantly more than in all other treatments. The average number of eggs 98.00 and 65.00 were laid on control and check strips/sectors respectively. When compared to petroleum ether extract (24.00) chloroform extracts and methanol extracts (27.00) and Distt. water extracts (91.00) at 5 percent concentrations of extracts. Similar order of effectiveness of extracts was recorded. Data clearly revealed that water extract was found to be completely ineffective at all the level of extracts. The 20 percent concentration of petroleum ether extract was found to be the most effective amongst the tested extracts and followed by 20 percent concentration of methanol

149 c o

« o e JS o u H w es ^« L. < in *o >? U e o '*_©^ a cs

O U H o w 2 1 < in E I o r- o en o ^ r-1 CO r- o o tH I^

•** u w u« a ^^ S? X 1X> CD a\ CM CM 00 •o r- n in «ri 00 IJD rH o n C8 ^^ T3 eg o .-1 o •"S" O V a u 93 9 o : 1 ^'2 -H CNJ ^I" OO IT) CN i-H V E 00 UJ in ^' •^ ! O <—' § w O *S H i u -i J2 uOS •O •^* S M A w < in I :^c: -1 51 :^" -i o -a" o E 1U " " " 1 _2 M o 5:5 *^h I B o , !s '!2 CM C, CM •H CM CM in o CTl CM w VD in in .H UD II W UD o o 4) 16 u O Q. O w i-l fc. >09. Jo 00 V «^ M CA < s C + g; 150 a in CO • • a.

•2i CO u < « u 1. p k 0) M h « s c o if •< eg U extract. The data on oviposition deterrency revealed that other concentrations of extracts were showed more or less similar effects on oviposition and did not differ significantly (Table 29).

It was found that viability of eggs, which were laid on the treated surface, slightly affected. Table 29 data revealed that 20 percent concentration of petroleum ether extract gave lowest ovipostion index (0.10), and followed by 20 percent concentration of methanol extract (0.15). The oviposition index on chloroform extract treated strips/sectors at 20, 10 and 5 percent concentrations gave 0.16, 0.20 and 0.25 respectively, while the other oviposition indexes were found to be slightly superior over control except in water extract treated strip/sector.

The average number of egg masses was 2.0 on all the treated strips/sectors except on water extract treated strip/sector. It was also found that all the extracts were mcreased the hatching period of eggs about one day (4.0 days) when compared to control and check treatments (3.0 days).

Effect on larval survival:

The toxicity of petroleum ether, chloroform, methanol and Distt. water extracts of T. compacta on C. auricilius (larvae) is given in Table No. 30. The data revealed that at 20 percent concentration, 24 hrs afler treatment petroleum ether extract and Distt. water extract gave the lowest survival (75.00 percent) of larvae and better than chloroform and methanol extracts (82.00 percent). The other tested

151 ocn or- om oooo OrH VD^H LOO 1 lOrH 0(M IDO OfO OiD 'X)© (NO mco r~cT\ Tr-

So oa^ om U3in on oin So *-;o or- o*^ "XJoo ovi> oo .o isll So -H(NJ OtH V£)00 TU? OOCM So O "" * £ ^ fTt CTir- r-'J? ^H*^' 1 C O & •fcri « u OCN om oo VDm OLO VOf-l OiD >fli^ * "S « ovD or^ om \o irt ooo w>.-) om £ iD r- '-Hc^ (N^ r-m com ^r- IHCNJ S1 uii mr- mr- oovo oou> oovo oo'X) mr-

u o a A •*• OP* on on om ovo OT O'^r II II JS « S E S 0(S OVD oy? 0>X) O.H O'a' 0«!r < CO < r-o ^vo -(Tvo niD ^^ oon oon U11 ^U moo oo'X) Qo^D a>^ OO\D moo moo iT) j-i o -^r 61) 08 ?^ 00 O a oo*x) oovD r-io p-io moo IH^ o i-sss -H IT) tH is> rr ro 00 moo OO ow? tnrH om mcM So E VO I--. 00 m r~ 00 r-oo ooo mo r^o moo csim ,o o o o o .H .H ^00 mo ^r- rHm r-rH voo So 1 mr- oor- oovo oo^x) r-vo moo ^H^ I Ofs* ocM om O'T on or- So •i-o « S Q \o ovo oo o^ oo o r-vD moo w*^ 1 o So om om om OtH oo So s i^« "-^o om oo oo om om .o ^ e So rHcsj r-m r-m CN^ •^rm So > Xi 1 i^ ^ <^ mr^ Qovo ooy> oovo mr^ ^*^ 'E s £ CO y3 in •H ^O s r- n r~ 00 ea C/3 i •*' en or- OCM o^ OT ovD So So a iH rH CN t~t ^ n 1 OCVJ OVO O^ O-^ O^D .O ,0 u i^l r-o Oi-t ^vD ^vi> nm So So 5^5 moo mp- covo OO\D OOVO )^ ^ i^ ^ •H CM tH 00 E in 00 lO B OCM om on oco oo oo So W3 O o o o rH iH V o»x> on ovo oo ooo om .o ml CNn mr- on CMOO OVO ^m So la S-SSJ mr- oo«) 00^ p-m i--m mr- ^H*^

ooo m^o mm mr- ocx> ooo So & Oi-H r-^ CNN oin mv or- .o o in

OCM o m oo om .o llll OrH OrH oom if) r- mo mt^ So mr- mr- ooto oovo r-vo mr- ^ ^ 3 Q * £ i w 00 CN r~ in fii . , 3 eg w « u ^o om om om OrH >:^c Xo 00 Q vc in 3 ^o OOO oo oo om .o ,o 2 ^1| So oom r-m vooo cM^a" So So S [2 ^m oovD oovD oovo oovo ^ <^ 7^ "^ u o en u -H n o VC CO CM r~ oo ovo ovo ovo oo o^ So b- E CN 00 1 ^E^ om ovD ovo ovD om OrH .o u •< o. mr- mo mo mo CM r~ So Ife • • nil mp- mr- oovo oovo r-vo mr^ ZL^ o in en es aa Ji o n£ 00 2 o Z if o n-HI U H f^ extracts were not found to be significantly superior over control after 24 hrs

exposure. It was found that the lower concentration of extracts were not effective

at all in reducing the larval survival. After 48 hrs exposure, 10 and 20 percent

concentrations of petroleum ether extract proved (72.00 and 70.00 percent)

effective.

The other tested extracts were not found to be significantly superior over

control. More or less, similar reductions in survival of larvae were recorded after

72 hrs exposure. Therefore, it was concluded that exposure did not have any effect

on larval survival. However, factor solvent, concentration and their interaction

showed at 48 hrs and 72 hrs were highly significant (Table 30).

Ovicidal action:

For one day old eggs, it was observed fi"om Table 31 that the treatments

like chloroform extract at 8, 10 and 20 percent concentrations and methanol

extract at 20 percent concentration were found to be significantly superior over

control and gave 74.00 percent of egg survival respectively, while the other tested

extracts had least effect on the survival of eggs over control and check treatments.

It was found that two days old eggs were found to be more susceptible to chloroform and methanol extracts and gave superior reduction in survival of eggs, when compared to one-day-old eggs (Table 31). However, factors a (solution), b

(concentration) and their interactions showed highly significant at one and two days old eggs (Table 31).

153 c o m O (^ .-H O in in iD CO T OD to o rr C\ >-! r-

*-C -O ii CQ ^ 0* •*"' • 05 Z a -

O 111 0 o i» U o u> o o o ^ o r- o m 1 « ill ^ IT)

cr, 00 CO r- CM CNJ LO in 2 E| S VD CO afli. -fli a* ^ •2^

-H r- o ^o o CM ^ 00 03 O CsJ o o 00 >X> r-i CD O ^ O ^ o

O ^ O iT) o o o -tr o o^ (0 cn tn 4< -j; I. o m I DC

O CN o o o a\ o cn I CO V£> C8 o) n CM ro LD r^ 61) IX) CM CM IX) •^ c\ o r- o o o §!£ o r- o U

-H CTi CO CD [^ I E [^ LO in -I o o u o r- o c\ (J III: O M3 ©. en tn

o r- O O (/I .2 ^ ^ ^ O T

l/i CD ^ CNJ LT; in m ei) a o c« u c O CM CM t: o 2 i/i U « c — c cr

o cr> o r- o r- o ro o CO .2f O •3' o O o ro o ^ o r- c tJ3 rt^ -, -fcrf •«M ui r^ ro in o ro CTi CM *1S4 a: - w s CO UD CD VD 00 VD r~ u? CO

Vi O aa u. < © c £ o ^ c o iHi4^ l U For three days old eggs, the chloroform extract at 10 and 20 percent

concentrations were found to be most effective and gave 60.00 and 57.00 percents

survival of eggs after 24 hrs exposure and also the methanol extract at similar concentrations gave 70.00 and 66.00 percents survival of eggs respectively. The other extract concentrations also proved to be effective but they were not as effective as chloroform and methanol extracts.

It is possible that repellent, deterrent and ovicidal activity of petroleum ether, chloroform and methanol extracts might be due to the presence of toxic compounds, which were highly soluble in the solvents used in the experiments.

T. compacta contains berbarine alkaloids which might be inhibit the oviposition and act as a deterrent and reduced the survival of one, two and three days old eggs.

It was observed that only higher concentration of extracts were effected the oviposition, survival of larvae and also the survival of one, two and three days old eggs, while lower concentration of extracts were not found to be effective al all.

Our results clearly reveal that only higher concentration of petroleum ether and methanol extracts were repelled the female from treated strips/sectors. The chloroform and methanol extracts were found to be effective against one, two and three days old eggs of C. auricilius. The larval survival was slightly affected by petroleum ether extract, while other extracts gave more or less similar reduction in larval survival.

155 Effects of Lantana camara Linn, leaves extracts:-

Lantana camara linn is a perennial strrub, sub strub or woody climber and

commonly found in tropical and subtropical zones. These plant to potential weed

and posses some pest control properties. The extracts were evaluated on C.

auricilins and obtained results in the experiment.

Effect on Ovipostion: Studies on the oviposition deterrency of extracts Table 32 revealed that the

number of eggs laid on untreated areas (control) were more than in all other

treatments. The average number of 115.0 and 87.0 were laid on control and check

strips/sectors respectively when compared to chloroform and petroleum ether

extracts (34.00) and 38.33 followed by methanol extract 44.00 and Distt. water

extracts 63.00 at 5 percent concentration. While at 10 and 20 percent concentration

chloroform extract was found to be the most effective followed by petroleum ether

extract. The other extracts were also showed superiority over control.

It was found that viability of eggs, which were laid on the treated surface were slightly affected. Perusal of Table 32 indicated that 20 percent concentration of chloroform extract gave lowest oviposition index (0.08), followed by 10 percent concentration of respective extract (0.16) and 20 percent concentration of petroleum ether extract (0.17). Other oviposition indexes were not found to be significantly superior over control.

156 B

Illu 2

44

O 4>

is.^ u w L.

2 CD

" o^ g; s? „ „ <^ rH in CN r~ TT CTi I rH „ •»- O CM 00 rH m Q ^ O CM O '\D

3 ^1 O" B 1 -H o

4 on all treated strips/sectors. It varies 4-5 over check and control. It was also

found that all the tested extracts increased the hatching period of eggs (4.0 days)

over control and check treatments (3 days) (Table 32).

Effect on larval survival:

The toxicity of petroleum ether, chloroform, methanol and Distt. water

extracts on C. aiiricilius larvae was given in Table 33. The data revealed that 20

percent concentration of chloroform extract was the most toxic to the larvae and

reduce the survival upto 55.00 percent after 24 hrs exposure. It was given

reduction in survival of larvae after 48 hrs and 72 hrs exposure (53.00 percent).

The lower concentrations of chloroform extract did not able to reduce the

survival of larvae significantly over control. Similarly, the other extracts also did

not able to reduce the survival of larvae effectively but they were found to be

slightly superior over control. More or less, similar reduction in the survival of

larvae were recorded after 24, 48 and 72 hrs exposure. However, the factors

solvent and concentration and their interaction were showed highly significant at

24,48, 72 hrs exposure Table 33.

Patel et aL (1993) tested extracts of Neem, Annona squamosa momordica charantina, Lantana camara, P. glabra, Diospyros cordifolia and Garlic against

Amsacta morei in field cages in Gujrat, India. Five percent suspension sprays of neem seed and leaf, custard apple seed and leaf, bitter gourd seed, Lantana leaf,

Kanzi seed, dhaki seed and garlic bulb have been found considerably effective

158 0\D OO 0*X> OCD Oin ^DCTi Cf^ 03 on lOo CD o\ o^ OT <-("«j' o^x* 41 CD ^ ro\D ooc^ csitf) 'X)f-i r-"!T mr- mco 0%r- 00\D 0OV£) p'li^ CTlOO CT^CD

^o ot^ G ovo o»x> VOTH .O ^O rH o a\ o^ OO oio or* So OfH OrH OW> OCT* on OCM .O xn r~ inr- mo cg^ P-TH ooin So mr- D ooin ooiT) in moo mr- 00"^ ^DID ID^ moo moo to o to r^ t-H tO ?;*i 00 O 'B* (Ti ^ oo^o mco moo

-H IT) lO on mo mr- on tn m mco So E U3 O (^ 00 OVD r-i-i cgT OVD r-»-* t^ r~ .o u O • iH• mr- 'a'oo m^n mr^ VDCSI OOVD SO CA moo mr- oor- OOVD r^ KD moo l^I*'^

So org ocsj om om So So ,o OVD ovo om ovo .o .o (A So cgn mr- rHog OIH SO SO I mi ^m mp- mr- mr^ mr- !H*^ rn^ So OP- om oo oo OP- So ,o ocvj OVD om om org .o So oom OrH CJT on oom So ^m moo mp- OOVD OOVD moo ^^ M CM in ,-1 "" 9 in CM o ui

o^ oo oo om OCM So So i-H CM 2? om om om on op- .o .o VDO ^m cg^ p-rH nvo So So in moo mp- OOVD p-vo m-tr JH*^ T^^ -H r-{ in CM O B E in t^ r- o So 004 om om on O

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o ro o ro o r- o ro o ro o uo o o O ^ o r^ o o o o O CO o o^ o ro in o CO

O CM O (M O rH o in o a» o in o o O ^ O 'T o o O 00 o a\ 5 o 2 o r- o r- n 00 fM 03 o vo 00 CT\ Kp in a* c t; r- in r- in p- in 00 \D

o o in o o O i O CO 00 CM o w) 00 (Ti r- in p' in r- in 00 vo o B .= 4>

o in o in o o O 00 II II 00 CM m o CM 00 < CO nil r- in

00 O O to O .H in CTt o o ro o in 'T O

•M vo en 00 m vo 1-t o o o r- o O ON vo -^r CD vo r- CO o a\ o ^ o O VD E bd • • o nil ^ o CA o o

O ID o in o in O CM o c^ o c^ 10 IQ o o *S o o O 00 O VD C C (SI CO 00 o ^ r- in r- in OS i'l e Vi o e o in o o^ o o O VD CO r- vo p- in r- in a\ r- E VD m o O CM in in in CM o in s CM CTi o o o in o m O 00 o ro VD O vo 00 00 a\ (0 (0 r- VD CO vo GO VD b. 00 VO •^ c c

V O CTl o o o in o in o ^c o in o o O 00 K o vo O r-t 00 nil 00 VO ei JSi 3 o in «M W 2 o o O O o o o in o in o m T 00 o in o o o o o\ o in o ro O 03 i % IT) 00 o i~- CM ^ o ro o ro r- ft VD 00 CD m s CO VD 00 VO oo VD r- vo r- VD 00 VD 00 VD .2 Q. '•S O CM •H w o m t- O Ol VD E VD IT) 00 VD VD O VO CO in r- VD 00 VO

o in C9 O O 00 00 0\ sigo • • I!ll 00 U3 c z BB cs I lid O u. H B is II ii o 1 u against 2"** instar larvae of A. moorei. However, A. indica seed was found

significantly superior to rest of the treatments by giving 92,22 percent mortality

followed by Neem leaf extract, which gave 72.22 percent larval mortality. The

custard seed extract gave 36.67 percent mortality. The rest of the extracts gave

larval mortality in the range of 46.67 to 54.44 percent.

Kulkarni and Joshi (1997) studied insecticidal action of neem and some

other plant extracts against Rhesala parata. The efficacy of methanolic extracts

from seeds A. indica and leaves of Aloe vera, Lantana camara viz. aculeate.

Datura metel, pomoea camea. Subsp. Fistulosa and A. squamosa, was evaluated

against larvae of R. inipareta in the laboratory. Three concentrations viz. 1, 3 and

5 percent were taken in each case. It was observed that seed extracts of ^4. indica,

A. squamosa and L. camara were statistically significant giving 84.35, 81.07 and

84,45 percent mortality after 72 hrs. The performance of neem products at 5 percent was also quite efficacious giving 68.69 percent mortality while at 1 percent, it gives only 27,62 percent mortality. Ovicidal action:

The bioefficacy of extracts were evaluated against one, two and three days old eggs of C. auricilius after 24 hrs exposure Table 34. Data revealed that all the tested extracts were superior over control but none of the extracts were significantly reduced the survival of one, two and three days old eggs. However, two days and three days old eggs were more susceptible, when compared to one day old eggs. The chloroform extract at 20 and 10 percent concentrations were

161 found to be the most effective and reduced the survival of three days old eggs upto

64.66 and 70.00 percent respectively followed by 20 percent concentration of methanol extract 70.00 percent and Distt. water extract 75.00 percent respectively.

The survival of eggs observed to be decreased as the concentration of extract were increased from 2 to 20 percents. None of the extracts were found to be effective against one, two and three days old eggs. However, Table 34 data showed that solution and concentration were highly significant while their interaction were non-significant at one - two and three days. In the choice experiment, it was found that the petroleum ether and chloroform extracts treated strips/sectors were least preferred by the female, when compared to methanol and water extracts treated strips/sectors. However, the viability of eggs were not affected at all.

Table 33 showed that chloroform extract at 20 percent concentration was found to be the most effective in reducing the survival of larvae, while other tested extracts were not able to reduce the survival of larvae significantly.

Pandey et aL (1979), recorded that the extract of L. camara showed insecticidal activity against Athalia proxima klug. It was concluded that reduction in larval survival was due to the unpleasing smell of extracts. Similar results were obtained by Sudhakar et al. (1978). The higher toxicity of chloroform extract may be due to the presence of high amount of "Latanine" alkaloid in the extracts.

The extracts of L. camara could be used as deterrent or as repellent and their

162 activity on oviposition, survival of larvae and on eggs of C. auricilius could be

effectively utilized.

Effect oiNerium indicum Mill leaves extracts:

Nerium indicum commonly Kaner, is a perennial or biennial flowering

plant, which is commonly found in Arid, Mediterranean and Cosmopolitan area. It

has pest control properties beside that also posses additional economic values. The

extracts were tested on C. auricilius and obtained in results.

Effect on Oviposition:

The selection of oviposition site in choice experiment showed that female gave less preference to the sites, which were treated with different concentrations of petroleum ether and chloroform extracts, while the methanol and water extracts treated strips/sectors were comparatively more preferred by female for oviposition when compared to control. Perusal of Table 35 revealed that female was completely repelled from strips/sectors, which were treated with petroleum ether and chloroform extracts at 20 percent level. However, it was found that some of the eggs were deposited by female at 5 and 10 percent concentration of petroleum ether and chloroform extracts treated strips/sectors, but out of which none of the eggs were hatch out Table 35. The viability of eggs were reduced by methanol and water at 5, 10 and 20 percents concentrations of extracts.

The oviposition indexes revealed the lowest oviposition index was 0.31 on methanol extract treated strips/sectors at 20 percent concentration followed by 10

163 c o M _o CM S e« .f « L. o ^ *rt o e JS f ^o •^^ W V lis- " C? III e o^ L. ^^ *rf u u w n > in o < X JS U

o es •o .2 1. 2 e 4' /-^ O > ii H V u o >^ es 60 u n <* «rt B £ w O V f< "i > u s < in V B B >

•H en II II o o o o n CO r^ r-t B o O (^ PI X _o O rH L< i) «rf O ••* W 1 B v § o o n CTi ID CM O

-H ro CTi CM CM O Xi O O 1^ in in ^ CM rH 1 s o r~ E e 1 CM 3 o o o o rH O e C8 e •C _o « Vri o o §:: S£ e o o r~- w M 00 v> '«B^ OS I O CA 1O ?w £a u o o o 2 rH O o r- o §: I i H 1 1 t- o o o o O o rH 1-H in u o o o o o m § g in 00 > 00 < o o O o tH •<=> M C F UD 4> WD §6 u O rH O o o o o W5 o o o V en o in i-C o o o o o « "S o g CD o in o a. «^ TH 00 o OS n o in ^ VD 00 o^ D OD :^ .-( CO V I-" X V u v% .Q > + + + o o o o 00 < o o * * + + B g ID in o i~- o Csl C + in g o in CM a CNJ ro ^£5 Csl o in 00 a\ ^ ID CO CO Z o. »H c tfi CS o «<> *rf (8 s /} E aa "o Q u •«: Bo a •o V ^ < «M 1 C «rf N^ Is m 1 o P o OB o o u © - O'-B* 09 £ OQ •— a« 03 «rf • 5 •^^ s^- u I. 4( i_ « u L. 1. c Z .£ en O H X IIB 5 01 S 0* U percent (0.36) and 5 percent (0.40) concentrations of respective extract, water

extract at 20 percent (0.48), 10 percent (0.50) and 5 percent (0.58) concentrations

respectively.

The average number of egg masses varied from 2.0 to 4.0 on treated

strips/sectors and also on control and check treatments. It was also found that the

average hatching period of eggs increased about one day, for the eggs which were

deposited on methanol extract treated strip/sector, while in general, it was 3 days

on other treatments over check and control (Table 35). Effect on larval survival:

The toxicity of petroleum ether, chloroform, methanol and Distt. water

extracts of N. indicum on C. auricilius (larvae) was given in Table 36. The data

revealed that at 20 percent concentration 24 hrs after treatment, petroleum ether,

Distt. water and methanol extracts gave 52,00, 52.00 and 62.00 percent survival of

larvae respectively. The 10 percent concentration of water extract was also found to be effective and gave 62.00 percent survival of larvae after 24 hrs exposure.

After 48 and 72 hrs exposure the petroleum ether and water extracts again proved to be equally effective (52.00 percent) at 20 percent concentration.

Followed by 10 percent concentration of water extract 62.00 percent and 20 percent concentration of methanol extract (62.00 percent). The chloroform extract was also effective and reduce the survival of larvae (65.00 percent) at 20 percent concentration, while it was (75.00 percent) at 10 percent levels of respective extracts.

165 c i/ir^ LDin iD'^o 'Or- moi oi~- C^IT) CN—I CM^ •—-H s r^m mu^

O*^ OCD OO Ot/l OT OO^ ^*^ ooo or- o^ oot Or-i Ot-^ ,o Sill csjm cT^o inr- cvjrH csi>X) mr- S*^ u cnr- oor- covo ^XJID IHT cnr- rn*^ 3 o - ^ 2 O 1 «< a o o^o o.-* OO oo oo^ oir> o«X) (A ^•5« t. «4:» eo •u« inoi inr^ oocsj ino (N«H (Njro \DOO S uS (T>r- <7ir^ r-vD r-io VDIO mr- I^ k.

0) B 4) o ocNi ovo OO OO on oo^ o^ 4> u >«Ika* ^ e c8 0.-H O^O OiD OO OI^ Oif) .O i B < inr- m

o rn o in o CO CM o o CM o o o o o CO IC in o o .-1 °§ III! m o CM CO o IS CM m C~ 00 r- rO rH U) PI S-aSg m in lO in m 1^ 3? 2? vo CM CM 'T ^

o >o o o o 00 in cn in o O S u lO si *^ so u 9 9i 5/3 en o CM o en o in O o CM in < iil °§ o CO o ID o en o o 00 °g en ^ CN en in > 'w' •= S •= P 5-22 !:: :^s

B -H or- on oa^ O CM'X) inr- o^ O O o o .-1 O £-SiS| co»X) r-vo r^in r-in in^ a^r^ rn*^

e inn in^ OCNI 0(T\ OrH .O .O ill! csjn O.H inr- CJ.-H CSJVD SO S^ 4> U Q- * 2 oir- o^r- oovD voin m^r ^H^ )H^ 3 O 3 •^ CN O 00 ^o o eo 00 ro i-i ^o OrH O'S* OT om Ot-H ,o •I 'Sou ?o mr- on on csjrH mr- S^ c « B t; S u ^X) 00«3 IDin (^ TH^ (J o. •H u X *• So om oin o[-^ ot-- o U u ~^ vDin

o. en en in o 166 ^21 S?i eg nil CO Q W «A •*^ BQ CQ 09 to. H i\ L. 4> o e u -u u e o L X C O o U H However, the factors of solvent, concentration and their interactions

showed highly significant at 24 hrs and 48 hrs exposure. The effects on survival of

larvae clearly revealed that higher concentrations of petroleum ether and water

extracts proved to be the most effective. Ovicidal action:

For one-day-old eggs, it was observed from the Table 37 that all the tested

extracts gave more or less similar reduction in survival of eggs. The higher

concentrations of extracts proved to be more effective, when compared to lower

concentration of extract. However, the 10 and 20 percent concentrations of

chloroform extract proved to be the most effective and reduce the survival of one-

day-old eggs 71.00 and 70.00 percent respectively.

For two days old eggs, it was found that all the extracts at 20 percent level

gave more or less similar effects. However, petroleum ether extract proved to be

the most effective at 20 percent level and gave 64.00 percent survival of eggs

followed by 10 and 20 percent concentration of chloroform extract (68.00

percent), petroleum ether extract (68.00 percent) and methanol extract gave (71.00

percent) at 20 percent concentration.

For three days old eggs, petroleum ether extract proved to be the most

effective and gave 60.00, 60.00, 58.00 and 56.00 percent survival of eggs over

control at 4, 8, 10 and 20 percent concentrations respectively. Similar order of

effectiveness were observed of chloroform extract treated eggs at 4, 8, 10 and 20 percents levels and gave 68.33, 68.33, 64.00 and 60.00 percent survival of eggs. It

167 00 in R o o u «> in ?-

o o O VD O U3 m in o m o o O T o r- o r- o r- o ^ O 00 m 00 m oo m 00 r- in ro in O .-H r- in r- r- tn r- in \£) in 00 \D eMn Pll in ii

"S o r- o r- O V£> o ^ O iH o tn o o s o vo (A O KD o r- o r- O 00 O VD o oo o •tat >, n CD m 00 in n m in OS r- in r- in vo in 00 \D nk. "O B •«-' V rl o ? .•S uw O CO LO CD in ^ ro o o ro in O iH II n ji| r- in VD in \o in VD in ID in 00 VD o^ r- < CP

o en o a\ o o o in o en o o s? o oo o p- o r- O VD o ^ O VD O 00 in 'S' kO CM >X> in cNi .^§ll 00 1X1 • tn in 'S' 00 V£) ** (Sliiu lO ^ Q CN tH m CM r- ^ u ' s in u> in in o in o r- in CNJ ro ro O .H «R r- CM r- 00 O P- o ^ 00 O O 00 ro 00 m 00 -H \D in 00 E CM 00 in r^ •g I/u} • • 3 o o Q o r- VD O O 1-1 O VD VD O o oo r- iH VD O VD O ro 00 C>J 00 in 00 O rH u (A lifl r- VD r- vo r- VD r- in r- in 00 VD tn r- CO in OS C C 4>

s o r- o r~ O VD O 00 o 'a* VD O O r-t O iH O VD O iH o o o 'a" VD O O 00 "S VD O CM 00 in o in 00 O .H M 00 VD r- VD p- in P- VD p- in 00 VD (n p- o 5i! ID CM CVJ ^ O VD o in O CM o in O VD o in O iH in o r- o o O 00 o m o r- o o O 00 CM CM r- in ro 00 CN 00 O VD GO in CD in VD 00 ^ n r- in p- in VD in VD in 00 VD

-H o r- O CM o in o in o a\ o in O rH 00 (TV o 00 .-H •s O VD o o o ro o in O rH o o o oo E (Tl CM

m PO in m in in O CO in p- o in O rH ec CO CO CO CNJ r~ CM 00 CM 00

o r~ o p- O P- O P- o o o in O rH O 1-1 O VD O VD O VD o o o o O 00 VD O VD O VD O in o VD CO O rH nil 00 VD r- VD r- VD r^ VD r- VD 00 VD ea i^ 3 T, 00 r- 'X> iT; 00 •M -^ en iD o r- o ^ o ^ O (^ o in o in O rH m o o o o O VD o m o o O 00 c o o O .-H cs a '^1 n CO CM CO CM VD O ^T k. cd O 00 o in o in o in in o o in O rH Q. » ei O CM o ro o CO o 00 o CO o o O 00 en o tn in p- rH p- r-H en VD CO O f-i .s m • • |IS| QO VD VD VD VD in CO VD en r- ce ca Q

"Z CQ H •S 5 - S e « 2 o B ? «^ 2 § .2 O ii u was found that methanol and water extracts also proved to be effective. However,

Table 37 data showed after one and Three days that solution and concentration

were highly significant, while their interaction showed non-significant.

Rao (1955, 1957) reported that extracts of N. indicum (flowers) posses

insecticidal effects against S. oryzae and observed the cent-percent mortality.

Saradamma et aL (1988) reported that benzene extract of N. indicum

leaves were reduced the population of insect population of insect pests,

Henosepilachna spp., Centrococcus insolitus Grand and Aphix gossypii Glover

infesting brinjal and H. vigintoctopunctata Fb. on bitter gourd under field

conditions at below economic threshold levels.

Our results are in accordance with those obtained by Rao (1955,1954) and

Saradamma et aL (1988). The results clearly showed that extract posses deterrent

and insecticidal activity. It may be due to the presence of some alkaloids in the

extracts, which might be responsible for deterrent and insecticidal activities of N.

indician extracts on C. auricilius.

Effects ofR, serpentina Bents. Roots extracts:

Rauvalfia serpentina is a perennial tree, which is commonly found in

Tropical areas and roots of these plant posses some pest control properties, it is

due to the presence of alkaloids in the roots. Therefore, the extracts of roots were evaluated on C. auricilius and the obtained results are described.

Effects on oviposition:

The selection of oviposition site in choice experiment showed that the

169 « 0

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'^ ,-1 •41 •o CN [^ 00 ro ro g 00 [^ in IT) •a- .-1 O E in 1 n 0 0 0 0 rH 0 s 1•w o R B ^ z .S _e o : M») •5 o , L. 0 Sf (M <» 's ^ ™ I O ^ ^ 35 ^ si? E 0 . (M 3 H °u e CD « I n :i; 1 ^ _ 1. I V > in °i^ < •^ _

I CM IT " ^ E < s^ CO W + + s in 470 Z 00 ^

Q K GO V «• • ^ CO OS £ c •0 V •:< < 1 U V u 0 |i u 0 CI u 111 1H o 2 x: u 0 4-t 01 u c H X X 0 S Q CI < % U female gave almost equal preference to treated strips/sectors with different

extracts. However, the number of eggs were deposited by female comparatively

more on untreated strips/sector, when compared to the treated strips/sector.

Petroleum ether treated extracts were slightly effective and gave (28.00) at 20

percent concentration followed by chloroform extract (29.00) and methanol extract

(30.00) at 20 percent concentration.

Perusal of Table 38 showed that viability of eggs was slightly affected by

petroleum ether, chloroform and methanol extracts, while the eggs, deposited on

water extracts treated strip/sectors were remains inaffected. The oviposition

indexes also did not reveal any significant differences amongst the treated

strips/sectors. The average number of egg masses varied from 2-3 on treated

strips/sector, while it was 3-4 egg masses on control and check treatments. It was

also found that the average hatching period of eggs increased about one day for the eggs, which were deposited on treated strips/sectors and it was remained 3 days for the eggs laid on check and control strips/sectors. Effect on larval survival:

The toxicity of petroleum ether, chloroform, methanol and Distt. water extracts of/?, serpentina on C. auricilius (larvae) is given in Table 39 revealed that at 20 percent concentration after 24 hrs treatment petroleum ether, chloroform and methanol extract gave 74.00 per cent survival of larvae. However, it was 82.00 percent on water extracts treated leaves when compared to control (100 percent).

171 in ro in n T-H in c CTi in ^ 00 m m CO r- CO V£) ^ <^

o o^ O CM o en O «T •5^55 O rH o "^ o ^ o ^ §; in r^ O r-H f*^ in o ro 00 ro o - ^ 00 'X) en CO :^°1

•o o o o r- ^ CO o in O 00 o o en J3 en o < 09 O P- O 00 o ^ o o o in < O rH ro in o n 00 CM CO in "5 00 KD 00 VD v£> in ^s V III in

OCM ocM CD r- o^ ocN >:^o >^o Vi •^ Om OVD OrH OrH O^ ,C3 .O S roin OiH rH^ oocM ^ r- So So V im (j\r- o^r- oovD r-^tx) r-in ^ ^ rn*'^ QQ -H CM r-t CTI 00 E iT) m or- OCM ooi incM tn yo m a\ So in^ iD^T oo CNjrH r-cM r-r- .o o o o o iH .-( •5 oovD roin c\ r-t CMin «>i-t oo^o So s: 1 (Ttoo cnr- oor~ OO>XJ r-«X) c\oo zio^

Oil O CI o r- o r^ yo ^^ :::J21 il -H cn n rH r- CO |ii E CO in in o o e u oo oin o KO oin O--H So So u ocy\ ovD oa\ o^ o^r .o ,o 'S'ln cMn CM'^ on i-tr- So So ml cnp- o\p- oo>x> oo«x) r-uo ^''^ TH*^

s OrH oo incM \r> -IT o •<^ in<^ So o ino in.H csjr^ CMrH OP- r-r^ .o vDfo .H^ tnr- csiin -x)© oovo So 1 oovD r->x> cnos ^H*^

So oa\ ocj\ o-'S' OrH ocn So ^-^o OrH oin o^ ooi o»-H .o O cs in r^ f-i CM X) o CM O ro o o o o o o rH* CM r- in t^ m M in -H r-i o in O o o o. E in CO i-H VO o in o ro o o o \i> o o o c U o \o o CM o t-H o cd OS llll cs Q L. JSi (A CO 42 < as "o • Si 2 t 4» J3C < O O B H E c fN •^ 00 O 44 c •- 0 f O 08 - O V C u H After 48 hrs petroleum ether extracts at 20 percent concentration proved to

be almost effective and gave 71.00 percent followed by chloroform extract at 20

percent concentration gave 75.00 percent, while methanol and Distt. water extract gave more similar effective at 20 percent concentration 80.00 and 81.00 percent.

After 72 hrs exposure chloroform extracts more effective at 20 percent concentration gave 68.00 percent survival followed by petroleum ether methanol extract and Distt. water extract (71.00, 72.00, 80.00 percent) respectively at 20 percent concentration. However, factors solvent concentration and their interaction showed highly significant at 24,48, 72 hrs exposure Table 39.

The results clearly revealed that none of the extracts were found to be much effective, which can reduce the survival of larvae effectively. However, the tested extracts were superior over control and check Table 39.

Ovicidal action: Persual of Table 40 that all the tested concentrations of extracts gave more or less similar reduction in survival of eggs and none of the extracts were found to be effectively reduced the survival of eggs (one day old).

For two days old eggs, petroleum ether extract at 20 percent concentration was found to be most effective and gave 72.00 percent survival of eggs followed by chloroform, methanol and Distt. water extracts 73.00, 74.00, 78.00 percent.

Similar order of effectiveness of extracts at 20 percent level was observed against three days old eggs. However, it was found that three days old eggs were the most susceptible when compared to two days and one day old eggs. Other concentration

]73 c

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O o r- O CM o es iT) I eg iD in m O 00 (0 to 4> Vi CM 'T CO CM i^ t-i r- f-i in o 00 00 (TV in c c 00 VO VO r^ VO VO VO 00 VO 00 VO es u *^ O O o o en o o VO o CN O CM .2 o 'a' o o o o m o CO O 00 9i (A c) in o n CM CO CM CO CJ% CO

O Vi> a. -H en 00 ^ en 00 r- o ro E VD •=? 00 VD VD CN ^ r- «-4 in o in o m 00 00 0\ 00 at u ill VO r- VD r- VD r- VD r- in 00 «> CO VD uc o vD O VD o n o o m B ^§1 • • CO

"A o b < 00 O e H o jl u of extracts also proved to be effective over control but did not gave significant

reduction of egg survival (Table 40).

On the basis of above findings, it was concluded that none of the extracts were effective on C. awiciliiis.

Effects oiHibiscus rosasinensis Linn, leaves extracts:-

Hibiscm rosasinensis commonly Gurhal is a perennial shrub or shubshrub flowering plant, which is commonly found in tropical and subtropical regions. The extracts of this plant were evaluated on C. auricilius and obtained results are described. Effect on oviposition:

The selection of oviposition site in choice experiments showed that the female gave almost equal preference to treated strips/sectors with different extracts. However, the number of eggs were deposited by female comparatively were on untreated strip/sector, when compared to the treated strips/sectors Table

41. Data revealed that none of this extracts affected the viability of eggs, which were deposited by female on treated strips/sectors. The oviposition indexes also reveal that more or less same hatching, at all concentrations of the treated extracts

(Table 41).

The average number of egg masses varied from 2.0 - 4.0 treated strips/sectors. While, it was average 5.0 egg masses on control and check treatments. It was also found that average hatching period of eggs increased about

175 M o .s e " lif t o ^S..s s s^- V2 w e «o in •><

«». o o u e '^ U ^« -*< X ** '5 — a 11 V ^ •« « ^ bc en w w es 4* B u O 0) w > m ."a < e o *3 = t: U B i £ o u 1 B E ^ 2 --> m u> <^ o CI •< ea ,Oi « — ^ P u O V o as r- r- 00 00 GO 00 O 'T M 4> in m CO (V 03 04 00 ^ a\ u> o

'C ift U3 o m 1-1 en *• IT) m C3^ CSI *£> in o '^ m , o §- Q IT) o ro o s U " " u> W Q •g 1 CM JS •w 08 B -H m o IT) OD JS JS ,o •** E "L '•C ;cr 2^ a §3 §5 t-H O .-I o ro o o £ o 1/3 O Ss :^- h 2 Si, ^w ^ w u — o CO n 1 OS C c I 4-£> 2H 1 t. V •a > o ; o o e < o §::? o o es n c o

C •^' 00 s e^ ^ „ „ ^ -1 ficnr- IT) oj "ir en 1 •^ ro i-H li> ^ O CM I ee w CSJ O i-H O «3> O B I O p §.:^ o ~ C3 E <^ 3 (^ ZJ. ^1 B CA is « E ft ^ "H ,-1 o r~ CM o o •^ M IT) •^ UD e g CD VD o U iJ IS o o o U "O -w O (A W H £ §^ p M S* V <> !-§ o . ^ o , C C o c 5 17& 1 m M •- u ea •S Q OS •< g- o ii. p i_ n 11M II 1. H «> «£« II o one day for the eggs, which were deposited by female on treated strips/sector and it remains 3 days for the eggs laid on check and control strips/sectors.

The results clearly showed that none of the extract were found to be effective to repelled the female fromtreate d sites (Table 41).

Effect on larval survival:

The toxicity of petroleum ether, chloroform, methanol and Distt. water extracts on C. awicilius (larvae) is given Table 42. The data revealed that at 20 percent concentration 24 hrs exposure after treatment, none of the extracts were found to be effectively reduced the survival of larvae. However, the chloroform and methanol extracts gave 74.00, 74.00 percent larval survival.

Similar order of effectiveness of chloroform and methanol extracts was observed after 48 and 72 hrs exposure to treated leaves. The data on survival of larvae clearly revealed that none of the extracts were found to be effective against

C. auricilus (larvae). Table 42 data showed clearly that factor a and b (solvent and concentration) and their interaction were highly significant at 24, 48 hrs exposure. Ovicidal action:

For one-day-old eggs, it was observed the Table 43 that all the tested concentrations of extracts gave more or less similar reduction in survival of eggs and none of the extracts were found to be effectively reduced the survival of eggs.

177 c o vo o r~ in m tn in o r~ o r- in m O r-i CSI 03 (N in O (N O

o r- o ^ o vo O CM o r- o r- °§ O CM O CM O CO O VD O CM O CM 00 in CM m O rH 00 in 00 in 3i|| ss

o o o o o o o r^ O <-H o r- o r- O tH O CM o crt O CTi O o r- lO a\ 00 0\ CD R Q '-' rn CM -a" IT) OD U •— '—' O

O .H O .H rH m

o o en o CM O CM §g o o in o §: tl5 §§ in p- CM o o .-t isil cn cn r- s?i :^2i iff

o o O ^D o r- O (^ o in o o a\ O CO O rH o cn °§ V in CM n 00 C\ rH "IT o u cn r- 00 V£) OO •^ r- in o °s ^21 X 1^1

O V O 1^ O C- o in V) ro O i-l O rH O iH o m 4-* o^ 00 O CM O CM tH ^ rH "T Q iH r-l rH iH as CD VO 00 VO r^ in III U e O CN o

s o o in vo in in in r* r- in o r- CM O OS O es O rH in o CM •«r n ID ^ ° es en CO en r- 00 VO r- VD "

o o O

O CM O CM o r- o in u •H CN CM VO CO O VD O U3 O tH o ro §: L- ^T in in vo t/1 E es O f-l O «H ^ cn «> o o o o cn r- 00 VD r- in ^ HI f«- • c u I CS o o O CM o ^ o r- s o

09 CQ eti < u. H at u o U L. O *' CO «^ o ro o ro 1 •r, n 00 O o og O CN .-1 r- r- in in r- in r~ r- in KD in U3 in 00 VO 00 «X>

O P- o ^ o o o ro o ro o r^ o o o o ro VD O O

2 1 '^^ O ro o r- o n o ro "o VD 00 5- S o ^r o r- O (M II w SOL. u 4> C tS in ro o o in r^ in r~ B >> r- in VD in VD in CD VD 00 VD O •a s ^ u 4> II 1. CQ A - tS o m o o O fO O VO o i^ o n o m H o t- O GO O 1- o in o r- O CM O (SI O VO m 00 tn c-j o o in r^ III VO m VO m VO in OO VO CO VO O VD U td in OS Q n CN VO (M o o o o O (N o n o m o m U VO 00 o o o o o ^ O tH O CM liil m o in o in r^ -1 r- m t- 5 i-sss r- VO to tn in r- in VD in 00 VD 00 VD

o r- o r- o in o ro o ro O CM o o o ro o r- O OJ O 00 isll CO CM in ro in r- 00 in VD in 00 VD 00 VD 01) OA w 8f ' "t^ o 2 o t^ O CM o ro O CO O CO O CM "S o o o o\ o ro o t-r O CM O OO Hi O VD VO 'S- ^ 00 in r- 00

H o m O CM o in o n O VD o ro O CM u S^ 6 o ? o r- o ^ o r~ o ^ o in O CM O CO 5 III CJl CM in ro T ro m CM in i^ 00 C7^ C- VD r^ in VO in VO in VO in CO VD 00 VO u"" w •H CM CO lO ^ .-I cn E r- ^ cri VD en CM M • • o o o ^ o m o o ro O CM o O CD o o o o O CM iill CD CV tl5 £Ji3B CD VD

to (0

B in [^ in VO o ro o in CN CM r~ o o CO O CTV VO rH CD VO r- 00 u 1 r^ VO r- VD VO in 00 VO

•fcirf o r- o ro o r- O o o 00 o m o in c o o vo o o o in o 00 o ^^ > VD 00 in in CO S? as CM o in o ro £ OO VD r- VD r^ VO r^ VO VO in 00 VD 00 VD en in 9i Il| !3 •n t—i U) 00 o « es -H lO -^ 3) Q CM 2 O ^T^ o h.^- o 0^0^ o VD o 0_0^ o ro . o i,_n c u ^^ VD in 00 CS ^ aSl o o o o o in o in o o o\ 4-* s V B t: 00 CM VD o 00 in 00 in 00 in fO in p- 00 c e>s> r- VD r- VD VD in VD in VD in ca VD 00 VD S u -H '•C k. r-

effective and gave 63.00 percent survival of eggs followed by methanol extract

64.00 percent, Distt. water 65.00 percent, and petroleum ether extract 70.00

percent at 20 percent concentration. However, the 10 percent concentration of

extracts also gave more or less similar reduction of eggs survival (Table 43).

For the three days old eggs, chloroform and methanol extracts were almost

equally effective at 20 percent concentration and gave 60.00 percent reduction in

egg survival followed by petroleum ether 64.00 percent and Distt. water 71.33

percent. Almost similar order of effectiveness of chloroform and methanol were

observed at 10 percent concentration and gave 63.00 and 65.00 percent survival of

eggs. In general, it was found that three days old eggs were the most susceptible, when compared to two days and one day old eggs. None of the extract were found to be effectively reduced the survival of one, two and three days old eggs. Higher concentrations of extracts gave moderatory reduction in egg, survival. Table 43 data showed that factor a (solution) and b (concentration) were highly significant at one, two and three days old eggs.

On the basis of above discussion it was concluded that only higher concentrations of chloroform and methanol extracts were found to be effective against C. auricilus, otherwise all the tested extracts were more or less equally effective.

180 Effects o{Diplazium esculantum (Ratz.) leaves extracts:

These are common at the base of hills but rarely ascends 1000 feet. These

are widely distributed in India. Ceylon, Malaya, Peninsular Islands and China. The

insect moulting hormone, ecdysones, occur in relatively high concentration in a

number of plants, especially ferns and gynmosperms (Swain and Cooper -

driver, 1973). The extracts of D. esculantum were evaluated on C. auricilius and

obtained results are described.

Effect on oviposition:

The selection of oviposition site in choice experiment showed that female

gave less preference to sites, which were treated with petroleum ether chloroform

and methanol extracts and Distt. water extracts. It was recorded that as the

concentration of extract increased, the number of eggs deposited by female were

decreased. The 5 percent concentration, the order of choice by the female were as

follows: petroleum ether extract (14 eggs), chloroform extracts (20.00 eggs),

methanol extract (23.00) and water extract (90.00 eggs) Table 44. Similar order of effectiveness of different extract were observed at 10 and 20 percent concentrations of extracts. Petroleum ether and chloroform extracts were found to be most effective amongst the tested extracts.

Table 44 data revealed that viability of eggs was slightly affected by petroleum ether, chloroform and methanol extracts. However, the eggs which were deposited on water extract treated strip/sector remains inaffected (Table 44).

281 o •g ^ fif ^

U

U •2 <« ^ es ^ I Is 4> 01) u ec BO u > S3 I. B s O 'ha

s: O 'T V£) O 4> B o rn U « s o o o o B >

II II e B O r-i 00 vo o £ is, o o u u a t o m «^ eg 00 r~ o s? ^ ^ o o m l£ li) i^ 1^ cn en n m 1£> o o «e#g n CM CM i-H .-1 TJ- ^Jl a> «J o u ' « v> o

-H

11 O o m o o — bfi + + + + * + u o r- o

§ §1 §: a < c es -< C2 -I" o

I °^ vo o r-H .-( cn CM a: t-H « I d' U, 31 ih CM m O CM m in ^ e« a 'T o n O r- o o u >> § o .o n rH !2 SC2 1 -H 00 o in ID r^ CO •g f= 'S' .-I o [^ IT) tH is O MD u g^ O 1—( t-i o T-H O CM O UD §: s u V ro rH eg (N)

1. •rr 1 o BQ s U •< GQ «« eg •< 4« -^ b. H I c y o • 111 Li o _g o u ill < OS • U The oviposition indexes showed effective at petroleum ether, chloroform

and methanol extracts. The lowest oviposition index (0.07) was recorded on

petroleum ether extract treated strip/sector at 20 percent concentration followed by

10 percent concentration of petroleum ether extract (0.10), chloroform extract at

20 percent concentration (0.88), methanol extract at 20 percent concentration

(0.11), 5 percent concentration of petroleum ether extract (0.11), 10 percent

concentration of chloroform extract (0.12), methanol extract at 5 percent

concentration (0.20), water extracts at 20 percent (0.58), 10 percent (0.72) and 5

percent (0.74) concentration (Table 44).

The average number of egg masses varied from 2.0 to 4.0 on treated strips/sector

while, it was 3.0 to 5.0 egg masses on control and check strips/sectors. It was also foimd

that the average hatching period of eggs increased from 3.0 to 6.0 days for the eggs,

which were deposited on petroleum ether, chloroform and methanol extracts treated

strips/sectors. However, it was 3 days for the eggs laid on water extract treated

strip/sector.

Effect on larval survival:

The toxicity of petroleum ether, chloroform, methanol and Distt. water

extracts on C. auricilius (larvae) is given Table 45. The data revealed that at 20 percent concentration after 24 hrs treatment petroleum ether extract was found to be the most effective and gave (58.00 percent) survival of larvae followed by chloroform extract (62.00 percent) methanol extract (70.00 percent) and Distt. water (78.66 percent). The lower concentrations of extracts did not showed

183 B O VD O ^ o oi 00 cr\ o ro OS O U3 in i-H r- o in T in o o vp O CM in CD in o «X) in

o o o CM o o o o o o a^ o o o o o CM o CM

^ in

o o o o O in o O o o O 'T o o o in o r- o O o OO o o o o QO 00 cn o o o B in <7\ o o OO 00 U3 in in CJ% cn o M es

B o o O CN o in o t-H CJ\ o o B u o - u o o §§ O o o 00 ro o o o S ! 2 o o B O o o o o o o o "o en u w li CTt 00 in in in CTV o < OuQ

o in O CM o r- o r- o n o n O CM O CM

If) r^ o ^ GO in 00 in o'^ -—K 00 \0 r- in in "q* a\ 00 m 00 00 n.— . r^ rM III! <4-«* lO CM CM es ^ Q rH. CM. CM n U E 1-* rH in r- O iH O TH CM r- in 00 in OO lO O Ot 00 0\ 00 ^ in 0\ 00 (D 00 "H CTl IT) CD n I g lO CD in CM u • • o o^ o a^ o r- o r- o r- •5 "O « OB O CO O ^D O iH O CM m in 00 in 00 in ^S 00 VD 00 tX>

(A O 0^ o tn o o o o O CM §: O 00 o in O 00 o r- o ^ M "2i "^

o m o ^ o in o ^ 5? O P- o -^ o m •n >-i CN •** IT) O cn yj

e o "tr o vo O CO O [^ o ^ O 00 O CO o in °§ °§ o ^ 00 in r- CM fO 00 C\ TH in IT) t~ 00 CO VO r- in in ^ ss ss lilt Ul o o o o

e 00 00 O rH O rH o es in ^ ^ o »-t CM in 00 in 00 ro in VO rH r- in at 00 cn 00 \o in o^ CO m 00 es es in

o r^ o i~ •5 X( 4» OS O CM O CM Q — i X in r- 00 m 00 in i rH CO 'a' CM X o in o in O 00 o o CM in in r-\ St u o t^ o in O 00 VD rH o cn es , . u t-H CM 00 cn m cn cn r- CD ^ t~~ in r^ in ;=i2i :=i?i u o u o ro e- -H O CO o o o o §: \£, IS> O CM E 00 CT\ >i> 00 es Mu o • o• > s°l 21

s i E ir « O rH CS V <8 §: §: Q. es • • 01 Oi -^ :i|4 s°i "?:

H 11 B Q.£ O i- r u significant reduction in survival of larvae. After 48 hrs the survival of larvae

(51.00 percent) was found at 20 percent concentration of petroleum ether extract

treated leaves and other extracts also gave similar reduction in survival of larvae

as it was found 24 hrs exposure. Petroleum ether extract at 20 percent

concentration was given found to be the most effective after 72 hrs exposure and

gave 50.00 percent reduction in larval survival followed by chloroform extract

59.33 percent and methanol extract 70.00 percent and Distt. water 84.00 percent. It

was observed that as increased the level of extract, decreased in survival of larvae.

The lower concentrations of extracts did not effectively reduce the survival of

larvae. The data clearly revealed that only petroleum ether extract at 20 percent

concentration showed promising results and it could be utilized for the control of

C. auricilius. However, factors a (solvent), b (concentration) and their interactions

showed highly significant at 24, 48, 72 hrs exposure respectively (Table 45).

Ovicidal action:

For one-day-old eggs, it was observed fi-om the Table 46 that the tested

concentrations of extracts gave more or less similar reduction in eggs survival.

None of the extract were found to be effectively reduced the survival of eggs.

However, all the extracts were superior over control.

For the two days old eggs petroleum ether and methanol extract at 20 percent concentration were the most effective and gave 73.00 percent survival of eggs followed by chloroform and Distt. water extracts 74.00 and 78.00 percent.

185 1/1 r^ o ^ in vo in n in o O T CM CNI in o r- en o o CO r>j 1-* r~ IC 00 O CsJ r- in r^ in r- in

h V O .H o m o o O r-i O .H O P O T o in o o o r- o t^ o r- o r^ o o o ro GO CM en 00 m 00 00 ON mt CO VO r- in r- in 00 VO

o a\ o o o r- o r- O T ro o o ^ o o o o O CO O 00 o en ro CM o o 00 CM in o o *x> o ^ .-H in O CM r- >xt t^ in r^ in "X) in 00 <>D M O C i S O GO O CD o o o o o in o P o -^ © o O CO o o o o o n o m o r^ o o (« U in o in o 00

o r~ o r^ O T o P o ^ 00 in rH ^ CM a^ o o o ix> o \i> o o 00 rH 00 00 VD VD 00 en O CM o o o *c o m CM 00 CM 00 in [^ O 00 o u> -H TT O CO O CO CM vo o KO O 00 (Tl Oi O E vo o GD ^£> r- ^o r^ in 00 *D CO r^ u CM

O f-H O iH o ^ o ^ O O o vo o in o in O rH O rH O 00 O VD 00 r- vo p- in r- in r- in 00 VD 00 r- 73 PI O ^^ (» ss CO r- vo r- ID r^ m GO vo OO 1~ -H 00 VD CO cr O rH O CM o r- O rH o o O vo E I~ iT) O

o o "x> o a\ o ' o in in o o vo o o o U [0 10 10 T. I O CM O 00 C C u

O p- o [^ o r- o (T\ o a\ o o o VD tiS O .-I o ^ o T o O o o o 00 o VD t-l ^ o CO o CO GO CM GO CM 00 (TV > o in o CO GO CM 'T CTl T CTl GO „-. •—• —• O .H o O.l , O r,- . o r- o i^. o o o VD M, (0 —10• + * in (r. o in o o O vo o vo o vo o 00 o VO c M c * * 1J& o n 00 CM VO o vo c> vo O CD CTl CJl O £ o 00 vo I^ VO r^ vo t^ vo r- VO GD VO OO r* • • |5i| Q1 L. o ce • •

respective extracts. It was observed that as increased the level of extracts,

decreased in egg survival.

The Table 46 revealed that methanol extract at 20 percent concentration

was the most effective against three days old eggs and gave 67.00 percent survival

of eggs, while other extracts gave almost 73.00 percent of petroleum ether and

Distt. water extract at 20 percent concentration.

On the basis of above discussion it was concluded that only higher concentrations of petroleum ether and methanol extracts were found to be effective against C. auriciliiis, otherwise all the tested extracts were more or less equally effective.

Mango et aL (1976) reported that ingestion of fern by insecticidal extra moulting formation of determed adults were also observed. Brown and Liewellyn

(1983) reported that the reproductive capacity was reduced in aphids, when fed on ferns. Later, Ravina and Gureeva (1985) reported that out of the 9 fern species studied, the ecdysterone content was highest in D. sibricum (0.3 percent) between early and beginning of intensive found growth. The egg and larval survival might be effected due to the presence of high content of ecdysterone and other alkaloids in the fern extracts. The data revealed that these compounds could exposed and utilized in management practices of C. auricilius.

187 Effects of Cymbopogan flexuosus (stapt.) leaves extracts:-

C. flexuosus lemon grass is a perennial herb plant, which is commonly

found in tropical areas. The extracts were evaluated on C auricilius and obtained

results are described.

Effect on oviposition:

The selection of oviposition sites in choice experiment showed that the

female gave almost equal preference to the sites, which were treated with the

petroleum ether, chloroform, methanol and water extracts. However, petroleum

ether extract at all concentrations were found to be most effective Table 47 data

showed that 20 percent concentration of petroleum ether extract was the most effective and gave 14.00 eggs on treated strip/sector, when compared to 130.00 eggs on untreated strip/sector followed by 10 percent concentration of respective extracts (18.00 eggs), chloroform extract at 20 percent (19.00 eggs). Similar order of effectiveness was observed with other tested concentrations of extracts, which were superior over control but did not effectively reduce egg deposition by female on treated strips/sectors.

Table 47 data revealed that viability of eggs were slightly inhibited by all the extracts, while the eggs which were deposited on control and check strips/sectors remains unaffected.

The oviposition indexes revealed in the data the petroleum ether extract

(0.09) at 20 percent level followed by 10 and 20 percent concentrations of chloroform extracts (0.16) and (0.13), 20 percent concentration of Distt. water

188 e o is c

u o u JS > u

o u e _o •2 •"

i e *^ u w e s u <

03 en rH tn o in o U O VO t-H (^ *-( CO tH 00 \o o *^ o o o o o o o o O r-l V B o U V u I I B > o n If) r^ II II a •-H r- iH CD CM OO in u m rn ro o CM ^T in o TJl O n O r- o — o U s o I s s ^"

•s -i ^ ^^ •H _ ^ ifi uo ^ .S — o : '> I u §; r-l 3 ^S 'S M ^C2

r §: ° in s ^ o §:

r—1 CM 3

.v» C §1 ^ u," VO IT) CTi s TH ^ CM •H „ •^^ 08 SD Q r- o U as *^b B Sri S-l V I is -H «n St. w S? O (M U) B E VO rH CM UD O u V u §; CA e 2- o -H r. CM 3 u OS •H _ u < 0) 0) + to a §: §: s c -* c"f e Z •H "11 a. c •Si la B <2 aa cs E = S o I f < I B W 2 u 1= I. o O " £ S S « 2 •fc^ XS B x; 4> W O U ^01 Q ^ 41 < 08 u extract (0.15), 20 percent concentration of methanol extract (0.15), 5 percent

concentration of petroleum ether extract (0.20), 10 percent concentration of water extract (0.30) and other treated extracts were more or less same (Table 47).

The average number of egg masses varied from 2.0 to 4.0 on treated strips/sector while it was 5.0 to 6.0 egg mass on check and control strips/sectors. It was also found the average hatching period of eggs remain unaffected for the eggs either deposited on treated or untreated strips/sectors. Effect on larval survival:

The toxicity of petroleum ether, chloroform, methanol and water extracts of

C. flexuosus on C. auriciliiis (larvae) is given in Table 48. The data revealed that none of the extracts were found to be effective in reducing the survival of larvae effectively after 24 hrs exposure. However, reductions of larval survival in all the treatments were superior over control. Similar results were obtained after 48 hrs exposure. The 20 percent concentration of petroleimi ether extract was found to be the most effective 72.00 percent and also similar to the effectiveness after 72 hrs exposure and gave 71.00 percent survival of larvae followed by chloroform extract

73.00 percent, while methanol extract 80.00 and Distt. water 81.00 percent survival of larvae. It was found that none of the extracts were effective against C. auricilius larvae. The lower concentration of extracts were completely uneffective and did not have any effect on larval survival (Table 48).

190 ou> ooi oin oiT) m"^ nr- oro OCD o^ inr- in.H rsioi mr- ovo lOOO .-HCN VOOO 0^^D \DO ODiD oo CT^OO

-jO o£> oo»x> oovo otoo a^oo

oo oo ovo on or- noo So 5o 2 OtTi OO^ OCO OCM O-^ mCNJ .O we*; ^ ir> ^iD cNim inp- om cnr- S^ c\ r^ a\ r^ o^r- oov£> oo^

oio org on oin OCM or- Sc> •S ^E 0«) 0»X> OCTt 0«T O^ OCM .O cgn OiH CM*^ on *-(r- coin So a^p- o^^- OO^D OOVD r-in moo rn^ 5? ,,^ tn .H "S" o n UO ^3* o

« .H. CM. B on iH^ O^ 0 u ino 1-tn vooo lOr- cocg cr»a>

-H n VD O ^r tH 00 E in CD r- r-i •a- CM OQ V0«> OrH OCM O r-- CO r^ 00 VD (TV 00

on o o O CM O O 00 O •'T °i °§ ^ in CM n O t-t 00 <7t 00 VD Is 2S w O i-t O O o n o vo o in s*: ^^ ^^ , o in o oo o eg o a^ o n °i °§- i« in 00 CM in in o > 4^ r- ro rn rH i^ ro ^ 00 00 en in p- eg ^ m es GO ^£> 00 VO 03 U> r- in 2S 2S rH . . •<)•* o CM CM m ^o lU U '

s O tH O (Tl O 'O' o ^ O 00 o in o ^ o

B o c^ tn p- o n O 'T 00 ^ e in 00 p- tr o eg in en in

O

o o O V O CM o o O T CM crv VO m O T O CN o r- O 00 O T j-t CM tN CM ^ in in CM in o eg n 00 en •T VO i u i'l C^ 00 00 VO 00 VD r- VD 2S 2S

o cr^ O «) o r- o r^ o in iey o «-* O 00 O rH O r-i o n °i °i in r- CM n ^ en 'iSl s <2J-a«5 ^ 2 o O e (J H r« •^ 00 e S o-S g o o < Ovicidal action:

For one-day-old eggs, it was observed from Table 49 that all the tested

concentration of extracts gave more or less, similar reduction in survival of eggs.

None of the extract were found to be effective to reduce the survival of eggs.

However, all the tested concentrations of extracts were superior over control.

For two days old eggs, methanol extract at 20 percent concentration was the

most effective and gave 72.00 percent survival of eggs followed by 20 percent

concentration of chloroform (74.00 percent), Distt. water (74.00 percent) and

petroleum ether 77.00 percent. Accordingly, similar order of effectiveness were

recorded at lower concentrations of extracts. It was observed that as increased the

level of extract, there were decreased in survival of eggs. The 10 percent

concentration of extract also gave more or less, similar reduction in survival of

eggs. The other extracts did not showed significant reduction in survival of two days old eggs. Three days old eggs were the most susceptible, when compared to two days and one day old eggs. The Table 49 data revealed that at 20 percent concentrations, all the extracts except methanol extract were equally effective and gave 72.00 percent survival of eggs after 3 days when compared to control, while methanol extract gave 66.00 percent survival of eggs. It was found that other concentrations of extracts also proved to be effective in the survival of three days old eggs (Table 49).

However, data showed that factors a (solution) and b (concentration) were highly significant at two and three days. The data clearly revealed that none of the

192 O T-t in m O U5 o ro O VD lO V£) o n in tH o vo O CO o r- O rH (N m 1 r- in r- in t> in

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survival of one, two and three days old eggs of C. auricilim. Effects of Manthapiperata Linn, leaves extracts:-

Mantha piperata linn, pipermint is a perennial herb which is commonly

found in Temperate areas. The extracts of this plant were evaluated against C

auricilius and results obtained in different experiments are described. Effect on oviposition:

The selection of oviposition site in choice experiment showed that all the

tested extracts gave almost equal preference to the treated strips/sectors by gravied

female. However, it was found that female were given less preference to the

treated strips/sectors with methanol, petroleum ether and chloroform extracts at all

the tested levels. The viability of eggs were slightly inhibited by all the tested

extracts except water extract treated strip/sector from where ahnost all the eggs

were hatchout. However, the eggs, which were deposited on control and check

strips/sectors remains unaffected (Table 50).

The oviposition indexes revealed that almost in all extracts were similar

only higher concentration of petroleum ether extract (0.36), chloroform extract

(0.40) and methanol extract also showed (0.40). The data clearly indicated that none of the extract showed oviposition deterrent effect against C. auricilius.

The average number of egg mass varied from 2.0 to 2.6 on treated strips/sectors. While it was very from 3.0 to 4.0 on check and control

194 e o ec _o CM B «rt n u O ^ •^ T3 z B o O 9 ^ TH J3 «i i- ^ Sss ?« «* _ o ^-^ «' 0"~ u CI > es < u in 'S 'S U s o w o a «1* u eg •** 0) •fi w « S w «B^ en *" flB o 1? H « u O w gfSf w B 4E< S3 O > L> "< in CM CM V E I E > «> (N O ^ o tr E o ^ ON II II M M O .H < CO 4t T3 2 e B •B^ 9. ^ m VD rH O O (T> CO O) c~ 5 "^ O •a* CTV ID O in tj\ lO O O 'w T^ GA u o S? ^ ^ „ a. w «« [^ ^ r^ CM CN n »- o n t-H CM n LD ge *> ? O CD n « V m Q ro o CM o in o U ~ " " 22 §1 -H r^ o in vc in CD "2 s CTv E 1 rH 21 -H 21 U rH O O O a «rf e B x«; _o (A \^ u « o u c N B s -i e cs u o >4> §s §s o < in t-H ^ •-1 21 rH 21

^ s «> I/} m <£> en in •^ n I •** CM 00 CTi M > V JS < + + to en * + o;^ E in "-^ s Z -e I o it 42 B 11= U strips/sectors. It was also" found that hatching period of eggs remains unaffected

for the eggs either deposited on treated or untreated strips/sector (Table 50).

Effect on larval survival:

The toxicity of petroleum ether, chloroform, methanol and water extracts

on C. auricilius (larvae) is given Table 51. The data revealed that at 20 percent

concentration, 24 hrs after treatment, methanol extract was found to be the most

effective and gave 64.00 percent survival of larvae, while other tested

concentrations of extracts did not showed significant reduction in survival of

larvae after 24 hrs exposure. Almost results were obtained after 48 and 72 hrs

exposure. However, Table 51 the factors a (solvent), b (concentration) and their

interactions showed highly significant at 24 and 48 hrs exposure.

These results clearly revealed that only higher concentration of methanol extract upto some extend proved to effective, while lower concentration of extracts did not have any affect on survival of larvae.

Ovicidal action:

For one-day-old eggs it was observed from the Table 52 that all the tested extracts gave almost similar reduction in survival of eggs. The higher concentration of extracts proved to be more effective as compared to lower concentrations of extracts when compared to control and check. The various tested extracts did not showed any significant variation in reduction of egg survival - similar results were obtained against two days and three days old eggs. 196 c in m O CTv o o fN .-H in T in ^ ^ CO O (M ro ^D a^ r- en r- OD \£> ^ CT. y 0\

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Goswami et aL (1987) reported in larval hatch for egg masses of M. incognifta soaked in aqueous extracts of Cassiafistula, Alocia Arabia (A. nilotica),

Eclipta alba, Swertia chirata, Datuva metel and Argemone maxicana and oil seed cakes of Carthanus tinctorius, Madhuca indica (M longifolia), shorea robusta and

Calophyllum inophyllum was studied. All were inhibitory.

The results revealed that M. piperata (leaves) extracts did not posses ovicidal, larvicidal and oviposition deterrent activities against C. auricilius.

2. Studies on the effects of non-edibie seed oils on C. auricilius Dudgeon, a) Effect on oviposition:

Perusal from the Table 53 that the female gave less preference to the sites, which were treated with non-edible oils. It was found that at 20 percent concentration oiA. indica and P. pinnata oils the average number of eggs laid by the female was 33.33 and 48.00 respectively. It was significantly lower than that recorded at Madhuca longifolia koengi and R. communis oils 79.00 and 94.00 eggs respectively, while the mean number of eggs laid on the untreated strips/sector at

20, 10 and 5 percent concentrations were 193.00, 190.00 and 180.00 eggs, respectively.

199 o ^ c CM —J: *rf o .^ cs

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iT)

oils showed significant reduction in their viabiHty. It was found that as the oil

concentration increased, there was reduction in the egg deposition by the female.

However, A. indica and P. pinnata oils was more effective in reducing the

viability of eggs as compared to M. longifolia and R. communis oils.

The oviposition indexes of A. indica and P. pinnata oils at 20 percent

concentration was 0.20 and 0.26 respectively, while in case of M longifolia and R.

communis oils, it was 0.40 and 0.47 respectively.

It was also recorded that there was reduction in the number of egg masses

on treated surface while, A. indica oil was very effective (20 percent) at all

concentrations. In comparison to other treated extract sectors, more or less similar to control.

The average hatching period of eggs, which were deposited on oil treated strips/sectors was slightly more as compared to untreated strips/sectors. The average hatching period of eggs, which were deposited on A. indica and P. pinnata oils treated strips/sectors varied from 4 to 6 days, while it was 3 days in control at all the concentrations tested. (Table 53)

Effect on larval survival:

AH the tested non-edible oils concentrations reduced the survival of 3 to 4 days old larvae of C. auricilius. However, A. indica and P. pinnata oils was found to be the most effective in reducing the survival of larvae when compared to R. communis and M. longifolia oils treatments after 24, 48 and 72 hrs exposure at

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o r- o o o in o ^ o m I U o r- o o o in o r- o n e B T in o ^ in o in ro ^ o CO y£> OO "^ r- in ^ in

o ro o a\ fO O O 00 o ro O CM o ro o r- ro r- o ro o ro « r- o CN T o ^ 00 in ^ o 5? •a 00 r- 00 VD 00 *^ 00 VO \£> in

61) O T CM in in in O VO o m VD VO n ro O rH (^ in VO in o •3 00 VO OO VO r^ VO in VO in

O CM O O '^3' o ro o -^r o ^ O T «T as 00 U7 CO V£> 00 VD r~ in VO in I 5? -a "1' in 00 CM 00 ro o V 00 T o «> o ^ O 'T O (Ti O VD OS o m O CO o ro O VD O 00 O > si? O iH in VO in VD O 'T O VO in o JO GO VO 00 VO 00 VD r- in a\ 00 u •S t f* I 5 I a n o a^ O 00 O 00 o ro o ro O VD -H in CM B O CM O CM O fH _ in ^ in 00 n O O VD O 00 o ro B CO o (^ B i-t ^ 00 CN) 00 CsJ VD O ro CN» in o (« o 'b 00 VO r- VD r- VD r- VD VD in en 00 B 9i o a\ o VO o VO O 00 O CO 1m O VO O VO o o O CO Op to tn o ^ O T in n in ro CO 00 CM ^ c c i 'b OO VO 00 VO VO in VO in in ^ VO OO CM in oo CM VO o to in » OO VO CO VO VO VO VO in (TV OD

O VD O "}' ro ro e u CO § o ^ o O VD r- l=s in VD o ^ CM CsJ "E CO VD CO VD r- in r- in VD in s o. O (Tt O CTi O CM O 00 o a^ «202 O VD O VO O o ro l^ • • o ro c c .1. O ^ O «T ro 00 r-i r- o >-* »n CO VD CO VD r- in r- in VO in 'ZJi s? + !r H i?|e e *• ^ Ti H CQ ?i o « 41 H o s U different concentrations of oils. The mean larval survival 97.00, 95.00, 94.00

percents were found in control treatment after 24, 48 and 72 hrs, respectively, but

it was significantly lower in leaf whorl sprayed with each of the five different

concentrations of oil. It was lowest in A. indica neem oil treated leaf whorl (51.00

percent) after 72 hrs exposure at 20 percent concentration, while in P. pinnata oil,

it was 60.00 percent. Generally it was found that as the oil concentration

increased, there was reduction in larval survival.

The larval survival decreased at a faster rate in the treatments sprayed with

A. indica and P. pinnata oils. When compared to R. communis and M longifolia in reducing the survival of larval. The eight and twenty percent emulsified concentration of A. indica and P. pinnata oils were significantly reduced the survival of larvae. The higher concentrations of M. longifolia and R. communis were also effective but their effects were found to be very slow. The mixture of effective A. indica and P. pinnata oils were found to be significantly reduce the larval with in 24 hrs after exposure. It was found that higher the A. indica oil concentration in the mixture, lower the larval survival (Table 54).

However, the survival on leaf whorl treated with 20 percent A. indica and

P. pinnata oils mixture (4:1) was 55.00 percent after three days of exposure. It was recorded that lower concentration of A. indica in the mixture did not show any promising reduction in larval survival.

The mixture of effective A. indica and P. pinnata oils were foimd to significantly reducing the larval survival with 24 hrs after exposure. It was found

203 that higher the A. indica oil concentration in the mixture, lower the larval survival,

Table 55. However, the larval survival on leaf whorl treated with 20 percent A.

indica and P. pinnata oils mixture (4:1) was 55.00 percent after 72 hrs exposure. It was recorded that the lower concentration of A. indica in the mixture did not show any promising reduction in larval survival (Table 55).

Ovicidal action:

The A. indica oil and P. pinnata oils had the highest ovicidal activity against all the developmental stages of eggs tested and it was followed by R. communis and M. longifolia.

In terms of the age of the eggs, the data indicated in generals the higher susceptibility of the older eggs (two-three days old) to the non-edible oils, when compared with newly deposited eggs (one day old). It has been observed from the data that when three days old eggs were treated with A. indica and P. pinnata oils, there was highest reduction in egg survival i.e. 48.00 and 50.00 percent at 20 percent concentration of respective oils. The interaction of concentration and treatments (non-edibles oils) did not show any significant differences in egg survival. The non-edible oils varied considerably in their efficacy against the eggs of C auricilitis stalk borer (Table 56).

This can be explained in terms of the differences in their physical and chemical properties as well as their behaviour.

Iwuala et ai. (1981) reported that the oil from the seeds of the edible fruits of Nigerian shrub, Dennetia tripetale G. Baker posseses insecticidal properties.

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£: -H CM O o in •M ^ M 00 CM in ^ V E •^ m m n ^'^ 08 u , , •s c« O VD o o o S O lO c * 55 o ^ u o rn 9 00 ^ &. CD ID 21 • • .s (0 to 10 7;to 205 s c c C C Q ??^ • 2 111 o o o H 00 cj V + + + o o o Z Z Z ^ m 1.0 o m O U3 O •=T ro CO o ro O 00 o o r- T a^ CM en iD CN CM 1 r~- \£) r- ^ VD iX) y£) LD ^ o in o eg o r- o r- O 00 O CM O VD ft! 1* in o o ^ in CO fsj in ec i r^ in r- in 2 "o ;2 O CM o rsj O CM o in O Ov o m o in o in O 00 eg 5 .S in «~H o n o n m 00 •a ^1* GO in 00 ^O 00 ^O 00 \D [^ lO u ^ S2 u **• •u B I W H O rH o o o in o CM O CM o in o o CM o O Csl e e cn o o in o «> •2 ® 00 in GO 00 r- in Z U "1' II II < n o c\ o o o CM O 00 o vo o 00 o o o o .1? rH CM in 00 O ^ r- o in ^ , . ,^ m 00 n 00 O V en ^£> 1 00 V£) r- in r- US ^£> in •a o o o o O 00 o -H 00 CM n CM o O T O CO o in E r- o 00 in en o o o o o in O CM O GO O GO s s-|l VD CM VO 00 O CO 00 in m GO ec s "D 00 in 00 VO 00 ^O r- in CfEf O s » •a g »i H O 00 O CM O iH o in O CO O t-H O CM o r- O rH O rH e ^ 00 O ^ 00 O 00 ^ GO in r- in vD in ^^ ^^ kD CO ;•sn 00 rH 00 O ^•1^ ^ 1X1 ID o •^ n CM eg . . Q 00 1^ r^ in O VD O rH o in o in o c\ O rH O

it •8 to to I O CM o in O CM O CM c c e o in O rH O 00 o a\ o .. O CO GO in CM CO GO VO •X) in e (n (^ s 3) 4> c o 2 15^» O CM ro r~ O CM O CM O CM n ID VD CSJ "o O rH CO rH o in o in O OS O r-1 e in o ff Q e 5 o. la O O CM o CM o CM o CM O CM O rH o CO o CO o r^ 00 UJ 00 1^ 'X) E o o GO *X? GO CO r- in u 4' T O o CM o o n ID IT) t: r^ u> in •«5 00 U> in tn I OS 9i CA "Z 1s 1 B ka '^ H E = g'^ p ^ S * ^ § BQ i. < f-" 2 - alii AH et ai (1983) reported that A. indica oil, M. longifolia oil, D. rosasinensis oil,

coconut oil and sesamum oil reduced the survival of Catlosobruchus chinensis L.

on gram. Pathak and Krishnan (1985) also reported neem oil a capable

ingredient, which was able to check rice moth (Corcyra cephalonica St.) in terms

of reducing the viability of eggs.

Mariappan et aL (1988) reported that A. indica oil, M. longifolia oil, D.

rosasinensis oil, were highly effective in reducing the survival of rice green leaf

hopper, Sardana and Kumar (1989) also reported that A. indica oil and P. pinnata oil were significantly reducing the damage caused by shoot and fruit borer under field conditions on okra crop.

Bhatnagar et aL (1995) reported in the ovicidal activity of non-edible oil

{A. indica, P. pinnata, M. longifolia and R. communis oils) against 1-2 and 3 days old eggs of Chilo partellus was determined in the laboratory at 270C and 75-85%

RH. Egg masses were dipped in 2, 4, 8, 10 & 20% oil A. indica & P. pinnata oils reduced the survival of eggs. Two and Three days old eggs were comperatively more susceptible to the action of these oils than one-day-old eggs. The other treatments were less effective.

Our studied reveal that A. indica and karanj oils were highly effective against maize stem borer from egg to 3 to 4 days old larvae. The efficacy of these oils to inhibit the hatching of eggs, when dipped in oil or laid on treated strips/sectors is another useftil attribute which renders the crop free from the pest of its most vulnerable stage or at nearly all stages of its growth. In the present

207 investigations the efficacy of A. indica oil was closely followed by P. pinnata oil

and it against the target insect. The data also shows that the susceptibility of

treated eggs to the non-edible oils in materially influenced by the progress of

embryogenesis.

Simons (1981) postulated the importance of using oil formulations with

naturally occurring antifeedants derived from plants. Although frequent

applications may be needed, antifeedants have the advantage of immediate action

over insecticides.

Adverse effect on oviposition by the application of neem products has been

reported in case of Spodoptera lititra Fabricus (Joshi and Sitaramiah, 1979);

Nilaparvata lungens Stal. (Saxena et aL, 1979) and Epilachna varivestis Mulsant

(Streets and Schmutterer, 1975).

A. indica was reported to be very effective against Antigastra catalaunalis

Dupon (Chadha, 1977); Leucopholis burmeistn Br. (Kumar and Daniel, 1981);

Sitotroga cerealla Oliver (Verma et al.^ 1983). Interest in pest control potential of other non-edible oils has increased after the success of neem oil as antifeedant, repellent and oviposition deterrent. The seed oil of Pongamia glabra was found to have an insecticidal effect on Holotricha consanguinea BI. (Nigam, 1977) and

Heliothis armigera Hubner (Kumar and Sangappa, 1984) offered a very significant reduction in the larval survival, oviposition deterrent and ovicidal action against maize stem borer.

208 The active compounds of non-edible oils have not been properly identified.

However, it has been reported that many of the non-edible oils possess saponins,

tannins, glucosides, alkaloids and toxic insecticidal compounds (Anonymous,

1978). Therefore, there is greater need to identify and use active compounds in

pest management system.

In the present studies, all the tested non-edible oils considerably reduced

the oviposition activity of female, survival of larvae and viability of eggs. The use

of A. indica oil, P. pinnata oil and their mixtures thus might be useful for meaning

the population of C. auricilius and less prove to the problem of development of

resistance. In this perspective, further, field studies are required to determine the

effectiveness of these non-edible oils under field conditions.

Lethal concentrations and Relative Toxicity of plant extracts and non-edible seed oils against Chilo auricilius Dudgeon.

The three to four days old larvae of C. auricilius were exposed to the

treated leaf whorl of sugarcane. In the experiment the observations on the relative

toxicity of effective plant extracts and non-edible seed oils revealed that at LC30

(lethal concentration required to kill 30 per cent of the test population).

Boungainvillea spectibili (wild) methanol flowers extract and Callistemon

citrinus D.C. petroleum ether leaves extract were the most toxic amongst all the

tested non-edible seed oils and plant extracts with its LCaovalues being 0.026498

and 0.027225 percents. Endosulfan taken as check and standard was excessive with its LC30 value of 0.0000540 per cent (Table 57).

209 1

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X X X X X X X X X X X X X X X X 00 t (S w^ •/^ so •>r 00 m 00 00 o sO fS r- > >> >s >s >s II >s >> >> 1 >>

00 00 00 r- rs| 3 00 r- SO 00 so o X r-i 00 so so

o o 13 2 2 4>^ E 2 2 1 tJ s u o >< u X "x X 2 X X 3 ! u s u u 1 •~» u X ! u X u 1 1 X u j 'w^ 1 M X <• V u u 1 1 u U > > u u ? to u to ? U > VI ^—^ 1 u _u > _« u n > u VI "5 o a > > _u _u 2 > u M 1 CO >• E u o h. w b- 1 CO ! u X 1 i u u 1u |a u 1 u JC i f J: u _«> u J= cd 1«-• _o u f •© u u k- "o 'S tJ t> u I E E •© e CO 1 E § E E E •© 3 S 3 3 3 o o U 3 U CO u u 3 u I u s Z 1 u j: £ 12 1 g s o U s _o «-• u ! 11 u > V i o 1 U 1 V) o t> i a. } 1a. a. u a. u cu 5 21 0 o O y-v .-^ .""S 2 .-=• > s •3

es 1 - r^ vi so r-^ 00 OS e H c/i 1 The order of toxicity of plant extracts was follows,

Endosulfan (0.000054 per cent) > B. spectibili methanol flowers extract

(0.026498 percent) > C. citrinus petroleum ether leaves extract (0.027225 percent)

> B.spectibili petroleum ether flowers extract (0.028354 percent) > C. Jlexousus

petroleum ether leaves extracts (0.028843 percent) > N. indicum petroleum ether

leaves extracts (0.028966 per cent) > C. sativa Linn, methanol leaves extract

(0.029205 per cent) > A': indicum Mill Distt. water leaves extract 0.029677 percent

> B. spectibili (petroleum ether leaves extract) 0.029720 percent > Calotropis

procera (petroleum ether leaves extract) 0.030048 per cent > E. globulus Labill.

methanol leaves extracts (0.030268 percent) >B. spectibili Chloroform leaves

extract) 0.030495 > A. indica A.juss (methanol leaves extract) 0.030946 > A.

indica oils (0.031458 per cent) > C. flexousus Chloroform leaves extracts

(0.031843 per cent) > Pongamiapinnata oil (0.032340 per cent).

A unit value of one was given to Endosulfan in order to esses the relative

toxicity of various plant extracts and non-edible oils. The methanol B. spectibili

flowers extract was the most potent extract and it was 0.0020378 times less toxic

than Endosulfan followed by C. citrinus (petroleum ether leaves extract)

0.0019834; B. spectibili (petroleum ether leaves extract) 0.0019044; Cymbopogon flexuosus (Petroleum ether leaves extract) 0.0018722; N. indicum (petroleum ether

leaves extract) 0.0018624; C. sativa (methanol leaves extract) 0.0018489;

N.indicum (Distt. water leaves extract) 0.0018195 B. spectibili (petroleum ether

leaves extract) 0.0018169; C. procera (petroleum ether leaves extract) 0.0017971;

211 E.globulus (methanol leaves extract) 0.0017841; B.spectibili (Chloroform leaves

extract) 0.0017707; A. indica (methanol leaves extract)0.0017449;^. indica oil

0.0017165; C. felxuosus Chloroform leaves extract 0.00\695S; pongamia pinnata

oil 0.0016697. Times less toxic than Endosulfan.

The LCso values of the plant extracts and non-edible seed oils along with

standard insecticide Endosulfan are given in Table 58. The order of toxicity of

plant derivatives and Endosulfan were as follows:

Endosulfan 0.0000735 per cent > B. spectibili (methanol flowers extract)

0.031725 per cent > A': indicum (Distt. water leaves) 0.033294 per cent > C. sativa

(methanol leaves extract) 0.033359 per cent > B. spectibili (wild) (petroleum ether

flowers extracts) 0.034256 per cent > A.indica (methanol leaves extract)0.034295

> C. flexuosus stept (petroleum leaves extract) 0.034297 per cent > E. globulus

(methanol leaves extract) 0.034486 per cent > N. indicum (petroleum ether leaves extract) 0.034634 per cent > C. procera (petroleum ether leaves extract) 0.035232 per cent > B. spectibili (wild) (petroleum ether flowers extract) 0.035283 per cent

> C. citrinus (petroleum ether leaves extract) 0.035580 per cent > C. flexous stept

(Chloroform leaves extract) 0.035599 per cent > B. spectibili (Chloroform leaves extract) 0.037683 per cent > A. indica oil 0.0018669 per cent > P. pinnata

0.0015944 per cent.

The change in the order of toxicity of plant derivatives from LC30 level to

LCsowere not noticed in case of Endosulfan, B. spectibili (methanol flowers

212 f v-1 •<1- o fn CM >o rj

CO 1

oe sO CM so vO <»1 Os o o 3 •r> p ii

U cI o t~ CM C3 "5 •* ''O 00 00 ir> f^ Cs| 00 Tt •* cs f^ cs CM m 00 a m 00 f*^ OS 00 ro 1- 0\ <») 00 CM so V» \o m o so oc cs S 00 >n >2 o !G <^ O CM Os ^ •* © 1 SI r~ oc — cs 53 cs C 2 rr> re r<1 OS ~ © m 2 <^ 00 H' O O CM O O O o o O O o o o o O O O O 2 en O o o o o d o d o d O O o d © d o d §1 © d o d o d o d d d O O d? d d -J J d d © d J -J d -J 3 J D -3 HI 3 _1 D -J 3 J 3 J X

Id so OS o Os >n © 00 00 00 OS OS 00 CO o- m m m n © 00, CM 00 OS d 3 ><> 00 00 >«• OS m d + + + + + + + + + o + + + + + + If cs o "CI o o se so 00 Csl 00 c* OS 00 en sO so O > >s >> II I 1; >s >>

C< Csl 00 n CM VO 00 so rr, sC c^ 1^ o m O CM 00 CM 00 Csl Csl Os

"5 4-> 2 2 VI 2 1 u CA "5 •a >? X X >? X 3 2 1 s u u 'c' CO II 1 u X > 1 >< 1 1 X /-*s ^^ 1 X Vi CO "S V} u 1 1 1 ts u u u u < u > > u > u u en v) > (A « "c a u a IS c jj > _o u M < u u g > > cs 1 cs c b. 1 b^ 1 _«» s u u u 1 ! u c JC «-• 1 u l- c 11 «3 "o o "o u 1 u •© •© 'S. i c c u 1 E E < es CO cs 5 i E E g e U e 3 t^ 3 3 JZ U o o 'E 1 Z '5 OCl 3 ^5 o !c £ J c 2 E 4-* U u o 1"S u > 1 1 u 1 1 Z e If 0. u a. 3 u p .•c- .O ^^ •3 ^ ^—^ 19 ?1 do •^ •2

N -n •« 1-^ 00 OS d H c/i , ,,. extract), (petroleum ether extract) A^. indicum Distt. water extiact (leaves), C.

sativa methanol leaves extract, A. indica oil and P. pinnata oil.

The methanol extract of B. spectibili (flowers) was again the most potent

extract, it was 0.0023168 less toxic than Endosulfan followed by (values of

relative toxicity was in the same order as order of toxicity).

0.0023168, 0.0022076, 0.0022033, 0.0021456, 0.0021441.0.0021431,

0.0021312, 0.0021221, 0.0020861, 0.0020832, 0.0020657, 0.0020646, 0.0019504,

0.0018669, 0.0015944-(Table-58).

The differences were found in order to toxicity at LC90 (lethal concentration

required to kill 90 per cent of the test population) in comparison to the toxicity at

LC50 level. Azadirachta indica methanol leaves extract was the best with its level

0.044199 per cent followed by N. indicum (Distt. water leaves extract) 0.044524 per cent, B. spectibili (methanol flowers extract) 0.045869 per cent, C. sativa

(methanol leaves extract) 0.046278 per cent, E.globulus (methanol leaves extract)

0.047535 percent,C. procera wild (petroleum ether leaves extract) 0.0471535 per cent, C.flexuosus (petroleum ether leaves extract) 0.048712 per cent, C.flexuosus

(Chloroform leaves extract) 0.0507453 per cent, B. spectibili (petroleum ether leaves extract) 0.051076 per cent, C. citrinus petroleum ether leaves extract

0.051639 per cent, B. spectibili (petroleum ether flower extract) 0.053228 per cent,

N. indicum (petroleum leaves extract) 0.053819 per cent, B. spectibili (Chloroform leaves extract) 0.060560 per cent, Azadirachta indica oil 0.06771 and P. pinnata oil 0.110331 percent.

214 1 r») in VO •'o^ £! •V 0 •* r~ VO 00 0\ ^^ 1*1 >n fN —

1•H «5 a. X

.$ .a -o 0 OV 1^ •0 •M t~- ^rt •* 0 d ov m M — 0 •* 0 r- 0 0 vo >r>

(L> cI o c *; — 00 <*) m J -J J -J J -J J .J ^ U _' d J d d 2 D -1 PJ DJ 3 J D J ^:^ D-J D - D -3 -' -J d -> i ^d h D -J

oc o> \o 0 vO W-i * 00 1 Ov o> «N fs| VO r^ vO VO r- © m ^— 0 ro •^ VO 8 0 0 0

o X X § X X X X X X X X X X X X X 00 r^ >r) n © r») >n •T3 •* 00 vq 0 CO CM o d 0; m' m ON ^ d Q 1« §+ + + + + + + + + + + + + + + + >f\ 00 VM c^ rs rv fn © m 1 ?^ 0 00 m 0 0 n g 0c p <*) (N W1 •«t r»l <»> »N II II II II II II II II II •V' 1 1 >I. >» >% >% >^ >. >. >. >> >» >. >. >> II ^ 00 n M m « « m 00 00 NO r-i o 00 •* m^ •* •

^ o «^ i 0 c3 2 E 1 0 1 2 x X E X 1X '5 u u u 1 1 "G X X 1 1 X u 1 i E 5 X u 1! u CO CO CO CO CO 1 X 1 t3 f u u J u u U V i u < '«^ u u -—s u ! u •T3 > u > CO > Z CO (O C3 > CO CO ' u u _U u u 1 c cs > > E : > > 1 >^ cs s) CO 0 1 _o a 1 1 CO u ! u u u u Hi 1 _3 e f 1 <• I •-» .f u "0 u u i 1 1 "5 1 CO 15 ^ c E 1 E 2 ! S u CO cs E 0 E E 1 i III 3 3 i 3 3 3 x: e (U 0 a. 1 a. 1 o 11 u 71 s .^ ^—V ^«^ ^^ ^ ^~. ; _ .3 ^ .0 • M ^^ '•^ '•^ •—' ^"^ — 1 "^ • d ~ Z ^ j d rs r^ TT V) VO ir-' 00 • ^ H 1 ' 1 1 A 1 The assessment of effectiveness of each extracts and non-edible oils comparison to Endosulfan revealed that A. indica (methanol leaves extract), N. indicum (Distt. water leaves extract), B. spectibih (methanol flowers extract), C. sativa (methanol leaves extract), E.globulus methanol leaves extract,C. procera

(petroleum ether leaves extract), C. flexuosus petroleum ether leaves extract and

Chloroform leaves extract, B. specitbili (petroleum ether leaves extract), C. citrinus (petroleum ether leaves extract), B. spectibili (petroleum ether folwers extract), A'^ indicum (petroleum ether leaves extract) B. spectibili Chloroform leaves extract, A. indica oil, P. pinnata oils were, 0.0020973, 0.0020819,

0.0020209, 0.0020031, 0.0019501,0.0019375,0.001903, 0.0018267, 0.0018149,

0.0017951, 0.0017415, 0.0017224, 0.0015307, 0.001369, 0.0007833 times respectively. Less toxic than Endosulfan (Table 59).

On the basis of LC30 and LC50 values, B. spectibili (methanol flowers extract) and on the basis of LC90 value A. indica (methanol leaves extract) amongst the plant extract and non-edible oils were found to be the best against 3-4 days old larvae of C. auricilius. However, Endosulfan insecticide was highly toxic in observations.

216 Residual toxicity by the foliar application against Chilo auricilius (Plant extracts & Non-edible seed oil) The experiment was conducted under the laboratory conditions. PT values of Eucalyptus globulus and Cannabis saliva leaves extract.

The survival of larvae in different treatments was studied by releasing them

in the trailed plants. The release was made everyday, till 100 percent survival was

obtained. Table 60 revealed that maximum PT value was obtained at 20.0 percent

concentration of E. globulus extract, while minimum was 5.0 percent

concentration of C. sativa Methanol extract.

The relative performance of different concentrations of E. globulus and C. sativa extracts with respect to their PT values were as follows (Table 60).

E. globulus (20 percent) 151> C. sativa (20 percent) 120> C. sativa (10 percent)

64.8> E. globulus (10 percent) 60.8> E. globulus (5 percent) 51.6> C. sativa (5 percent) 45.

Percent reduction in mortality:

From the survival of larvae, the percent reduction in the larval mortality was recorded.lt was noted that maximum reduction in mortality was observed at 5 percent concentration of E. globulus and C. sativa extracts and least reduction in the mortality of larvae was observed at 20 percent concentration of E. globulus &

C. sativa extract (Table 61).

The maximum persistence of toxicity (5) day recorded at 20 percent concentration of E. globulus. The Table 61 data revealed that 5 percent

217 u

oo H o »rj o 0^ vO '-

M V vq O > o A — m

o m yri fo CO C9 p s «n O

p p o I in «n o

o ts p p p p O o o «n OB A a e g p O p O O o o o O o o o 00 «n m i (N o -o I 'St (N 5 5 o O S «n ^ (oN .^ 4> a ^ •••1 o 'S U o o '• •4-* 3 "^ « > 0- < 52 .. « 218 ••a o i ft- H H H p o p p o o o oo o

I o o •I oo

a

p p o M o o 00 00 o i

• PM p p o o o o t 00 o o i OS I p p o p o o at OO o oo 00 o e i o o

o •^ CM p O 1/^ 00 00 ON O — X C ^ •4-* 0)

«s fo v> « 219 E. globulus methanol C. satlva methanol leaves extract leaves extract

160.00 150.00H 140.00 8 130.00- ^ 120.00- > 110.00- ^ 100.00- S 90.00- ^ 80.00- g 70.00- c 60.00 -R 50.00- E 40.00- Q! 30.00- 20.00- 10.00 0.00 5 10 20 Percent Concentration

Fig. 2- Comparison of persistance toxicity of Eucalyptus globulus Labill. and Cannabis sativa Linn.

220 concentration of £. globulus and C. sativa persisted for only 3 days. 10 percent

concentration of E. globulus persistence showed 4 day but in case of C. sativa it was 3 days. C. sativa at 20 percent concentration persistence showed 4 days.

The survival of larvae in different treatments indicated their superiority.

Among the different concentrations only 20 percent concentration of E. globulus methanol extract persisted for 5 days, while the other concentrations persisted only for 3 to 4 days. It was found that higher concentration of both the extracts showed more PT values as compared to lower concentration of extract (Fig. 2).

By the above discussion it was concluded that higher concentration (20 percent) could be utilized in control of C. auricilius larvae. However, the persistence of these extracts were not very long. So, fragment foliar spraying may be required.

PT values ofB. spectibili (wild) leaves & flowers extracts:

The survival of larvae in different treatments of B. spectibili leaves and flowers extracts was studied by releasing them in sugarcane plant. The release was made every day, till 100 percent survival was obtained. Data showed, PT values for each concentration was calculated (Table 62) from the experimental data, it was clear that maximum PT value (110.0) was obtained at 20 percent concentration of B. spectibili (petroleum ether leaves extracts) and minimum PT values (49.0) was at 5 percent B. spectibili.

The relative performance of different concentration of extracts in respect to their PT values were as follows:

221 B. spectibili (petroleum ether leaves extract) 20 percent (110.0)> petroleum

ether flower extracts 20 percent (92)> (chloroform leaves extract) 20 percent

(91.0)> (petroleum ether leaves extract) 10 percent (84)> (methanol flowers

extract) 20 percent (74)> (methanol flowers extracts) 10 percent (71)> (methanol

flowers extract) 5 percent (60.0)> (petroleum ether leaves extract) 5 percent (57)>

(petroleum ether flower extract) 5 percent (54.9)> (petroleum ether flower extract)

5 percent (52.0) and (chloroform leaves extract) 10 percent (52)> (chloroform

leaves extract) 5 percent (49.0). Percent reduction in mortality:

It was noted that maximum reduction in mortality was observed at 5 percent concentration of chloroform leaves extract, while the least reduction in mortality was observed at 20 percent concentration of petroleum ether leaves extract (Table 63).

The 10 and 20 percent concentration of extracts showed maximum persistence of toxicity up to 4 days, while other extracts persisted for only 3 days

(Table 63).

It is showed the Fig. (3) and Table 63 that various extract were lost their toxicity after 4 days. The highest persistence toxicity (110.0) were recorded at 20 percent concentration of petroleum ether (leaves extract) and its residue persisted for about 4 days followed by petroleum ether flowers extract at 20 percent concentration (92.0). The lower concentrations of chloroform leaves extract had least persistence toxicity.

222 OO Tt ^- ::: 22 f-^ 2 <^

O <—1 Tj- (mN 2^ <>O»N •^ S :: 0\ in vo r^ r-

^

m Tt Tf "^ -^ TT m m Tt m m 'sr

p p pop p (N (N in in en

pop p p o o o <=; o "=? f*^ >o o o u-i in (N O O liij oo z: ^

o o o o o o o O O o O O in 00 o o o o en o o o o

«^ 2 o -> 2 o •^ 2 o m o o CM ^ (N 1 V)

.a .a o o o u u M s V u V u > »3 o o "- s OS > o C •S Si, k. s E o ^ «« J3 i C •c « H k. "o ft, <; o B II II s u S • • s s 223 U 0- H OH

H u o o o o o o oo o o OS

O o o O o o O o o C 00 "o o B e« o en 00 00 o o (J es o o o o o o OO OS o I 1 o o o o C ©^ o o o o o 00 OS « 1-H o B s o o o o 2 S5 o o e •** oo ON C8 O a ©^ o u o o o p ©^ o o o oo «n od o i ON OS

o o o 00 o o S 00 o\ o o o U 411* p o o ••-I e o o t X 00 ON o o » o & O o in IT) o oo OS o e & a o O o o u IT) tn oo oo o

08 U >»• en 224 a fS fo *n S .fi H Petroleum ether leaves extract Chloroform leaves extract

Petroleum ether flowers extract Methanol flowers extract

(0 0 3

>

0 •>0< h 0) 0 c IB (0 8 Q. 10 20 Percent Concentration

Fig. 3- Comparison of persistance toxicity oi Bougainvillea spectibili wild.

225 Thus, from the above, it was concluded that the B. spectibili leaves &

flowers extracts at higher concentration can protect the crop again C. auricilius

(larvae) up to 2 days effectively, however, the residue persisted up to 4 days. PT values of A. indica, A. Juss leaves extracts:

The survival of larvae in different treatments was studied by releasing them

in the whorl of treated plants. The release was made everyday, till 100 percent

survival was obtained. The (Table 64) data revealed that maximum PT value was obtained at 20 percent concentration of Chloroform extract (98.0) followed by

Methanol extract (20 percent) 90.0> Methanol extract (10 percent) 77.0>

Chloroform extract (10 percent) 63.0> Chloroform extract (5 percent) 50.0>

Methanol extract (5 percent) 28.0.

Percent reduction in mortality:

For the survival of larvae the percent reduction in the larval mortality was recorded. It was noted that maximum reduction in mortality was observed at 5 percent concentration of chloroform and methanol extract, while least reduction in mortality was observed at 20 percent concentration of Methanol extract (Table

65).

In general, it was observed that 10 percent and 20 percent concentration of extracts were persisted for 4 days, while the 5 percent concentration persisted only for 3 days (Table 65). It is showed from Fig. 4 and Table 65 that Chloroform and

Methanol extracts at 10 and 20 percent concentration were the most persistent (4 days) was recorded at 20 percent concentration of Methanol extract after one day

226 u "2 «n rt ^ vo en

00 O o <3N ON

VO t^ ir> ^ en OS «n OS

m m

p p p p 00

o O p p o en d o d 12 O ig ^^ o p p o p O

S

B O 'V 2 «n o o »r> O •S s o If o U II O

s B Ii

s s fi II <2 s 227 • m u o H u a> a- H 3 U H o o p o o o o o oo oo o

— « o p p p o at o o oo o 00 o

V

I S5 O 00 00 o ON ON o

p p O • p o o O i OO o is

s o -^^ O o ^ o o rf O o f- 00 o ON o u 2 r o S

e p o p o IT) o 0^ o o 00 • PM u T3 u e

228 • • n m trt IT) H

H Chloroform leaves Methanol leaves r extract extract

(0 O 3

>

O o H 0) u c (0 (0 0 Q.

5 10 20 Percent Concentration

Fig. 4- Comparison of persistance toxicity oiAzadirachta indica A. juss.

229 of foliar application, while it was minimum at 5 percent concentration of respective extracts.

These finding by the work of Moong and Sudderuddin (1978), who observed the persistence of neem leaves extract up to 10 days on treated plants.

Similarly, residual toxicity of dried and powdered leaves of neem was reported by

Ahmed et aL (1980) against S. oryzae fi"om 1 to 3 months after application. Thus, from the above, it was concluded that the use of neem extracts can protect the crop up to 3 days effectively, while the residue persisted up to 5 days.

PT values of Calotropis procera (wild) and Thuja compacta leaves extracts:

The survival of larvae in different treatments was studied by releasing them in the whorl of treated plants. The release was made everyday, till 100 percent survival was obtained. It was also clear (Table 66) that maximum PT values was obtained at 20 percent concentration of C. procera and T. compacta (petroleum ether extract), while it was minimum at 5 percent concentration of respective plant extracts.

The relative performance of different concentrations of petroleum ether extracts of C procera and T. compacta with respect to their PT values were £is follows:

Petroleum ether leaves extracts C. procera (20 percent) 75.0> C. procera

10 percent (62.0)> T. compacta 10 percent (51.0)> T. compacta 5 percent (48.0)>

C. procera 5 percent (34.0).

230 Percent reduction in mortality:

From the survival of larvae, the percent reduction in the larval mortality

was recorded. It was observed from the (Table 67) that maximum reduction in

mortality was recorded at 5 percent concentration of C. procera extracts while it

was least at 20 percent concentration of both the plant extracts.

The Table data on the persistence of plant extracts revealed that tested extract concentrations of T. compacta and C. procera 20 percent concentration persisted for 4 days, while the other concentrations of C. procera persisted only for 3 days (Table 67).

It is evident from Fig. 5 the petroleum ether extracts of C. procera and T. compacta at 20 percent concentrations were showed almost similar persistence toxicity.

It persisted up to 4 days from the data, it was observed that the higher concentration of both the extracts were effective against C. auricilins larvae and also persisted more, when compared to lower concentration of extracts. PT values of iV. indicum Mill. Leaves extracts:

The survival of larvae in different treatments was studied by releasing them in the whorl of treated plants. The release was made every day, till 100 percent survival was obtained. Form the Table 68, it was clear that maximum PT value was obtained at 20 percent concentration of N. indicum (petroleum ether extract), while it was least at 5.0 percent concentration of chloroform and Methanol extracts.

231

H OH

Vi en

> p p o p

es 61) it M p p p o ro p en o o 00 A S ^«

« es o p p p p O C3 (N yr% W-) O s ^ u u p p O p o o

a o

2 >ri o o «r> o o «a k u B a. O

® 5 .a a w es es u

••-> B 2 *- V .2 "^ E « > -*« g ^ OM < es II II V "^E 8 E u 232 C«H V u a> 0- H ON ON 0 0 0 0 o 0 in o 00 o

u

^ 4) k. ^ 0 0 0 0 o 0 •n 0 o ON ON 00 00 o I ? > a

o I in 00 o 00 00 00 o o ON

0 0 0 0 p t o 0 0 00 ON o I o I 9 '«' C8 h ^ ^ S5 p p O o «n O g I «4> ON g r ; © «iJ - S

IS in 00 O 00 ON o « OO' O

e >

V O

H•u • u _ C. procera petroleum ether T. compacta petroleum " leaves extract ether leaves extract

80.00

(0 Qi 70.00 (0 60.00 > 50.00 X 0 H 40.00 o o r 30.00 (0 (A 20.00

Q. 10.00 0.00 10 20 Percent Concentration

Fig. 5- Comparison of persistance toxicity of Calotropis procera and Thuja compacta.

234 The relative performance of different concentration of A^. indicum extracts

in respect of their PT values were as follows.

N. indicum extracts petroleum ether extract (20 percent) 100.0> petroleum

ether extract (10 percent) 70.0> petroleum ether extract (5 percent) 60.0> D. water

extract (20 percent) 54.0> Dist. Water extract (10 percent) 47.0> Methanol extract

(20 percent) 40.0, chloroform extract (10, 20 percent) 40.0> Dist. water extract (5

percent) 35.0> methanol extract (10 percent) 30.0> methanol extract (5 percent)

15.0 and chloroform extract (5 percent) 15.0.

Percent reduction in mortality:

From the survival of larvae, the percent reduction in larval mortality w as

recorded. It was observed from the Table 69 and Fig. (6) that maximum reduction

in mortality was recorded at 5 percent concentration of chloroform and methanol extracts, while least at 20 percent concentration of petroleum ether extract.

The data on the persistence of extracts revealed that the maximum persistence of toxicity (5 days) recorded at 20 percent concentration of petroleum ether and water extract. Table 69 revealed that other tested concentration of extracts persisted for only 2 to 4 days.

The survival of larvae in different treatments indicated their relative superiority. None of the extract concentration persisted for more than 5 da\s.

Among all concentration of extracts, 20 percent concentration of petroleum ether extract showed the highest PT value (100.0) as compared to other concentration

(Fig.6).

235 •uo (^ (N —1 0^ vo vO C^ 00 ^ r- lo -^ o

H o o «r> O O moo m i^ •^ OH vo r~ — '^ Tf — ro Tf m •^ wo

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o 00 OS o

o p p o o o o t oo 00 OS o E 2 2 ^ o o o 00 OS o I o t< oo

O O IT} 00 ON o 5 o o O O o o o o OS o t: so 00 OS o B E g o o O S vn oo OS O ^O o « bi -teva s a. p p p o p o oo o oo OS o o e U s 0^ 237 ON «s •D tn

H Petroleum ether leaves extract Chloroform leaves extract

Methanol leaves extract DIstt. water leaves extract

110.00

(0 100.00 O 3 90.00 ^ "(5 80.00 > 70.00 o X 60.00- 0 I- 50.00- o 40.00- c 30.00 B I0 ) 20.00 H o Q. 10.00 0.00 5 10 20 Percent concentration Fig. 6- Comparison of persistance toxicity of Nerium indicum Mill.

238 It was concluded from the percent finding that among the various extracts

ofN. indicum, petroleum ether extract was highly persistent.

PT values of Diplazium esculantum (Retz.) leaves and H. rosasinesis Linn, seed extracts:

The survival of larvae in different treatments was studied by releasing them

in the whorl of treated plants. The release was made everyday, till 100 percent

survival was obtained from the Table 70, it was clear that maximum PT value was

obtained at 20.0 percent concentration of//, rosasinensis (petroleum ether extract) while it was minimum at 5 percent concentration of D. esculantum (chloroform extract).

The relative performance of different concentration of D. esculantum and

H. rosasinensis extracts with respect to their PT values were as follows.

H. rosasinensis (petroleum ether extract) 20 percent 67.0> H. rosasinensis

(petroleum ether extract) 10 percent 65.0 and {D. esculantum, petroleum ether extract) 20 percent 65.0> D. esculantum (chloroform leaves extract) 20 percent

52.0> D. esculantum (chloroform extract) 10 percent 50.0> H. rosasinensis

(petroleum ether extract) 5 percent 40.0> D. esculantum (petroleum ether extract)

10 percent 35.0> D. esculantum (petroleum ether extract) 5 percent 25.0.

Percent reduction in mortality:

It was noted that maximum reduction in mortality was observed at 5 percent concentration of D. esculantum petroleum ether and chloroform extracts.

239 I.

•o t^ VO

H O (N o

VO rn m vq vd :2 vd ^ od

m m

9i

VO p .52 e 9i •s O I »n I

p p p m (3 9i

en N o O o o O o o o O O en

o p o o o p p p o O s: E o d d d d d d ••e-

«ha o o o o o o o o 1 c> d d o o o o en en en I e o ft o o o o m o o 9i «n »o U e II o o U s il •o C OJ y •a « t; e II CBJ S e *^ lis « ^ >< II II • • R 240 o «i> a s .^ 111 r- Vcs i s '^ L. 0- E- - tt « - p o p O o o O oo 00 o

p o o OO o en oo ON Os o

O ^ p o p »n NO o lit 00 ON o

o 00 O 00 ON ON o

O S5 o 00 d o o o ov o f4 ON g Oj u

S e >* ^ o o a s ^ d NO m o Si ^ S 00 00 ON

O d 00 o ON o ON

B ^^ 241 ri f<> Vi u D. esculantum petroleum ether D. esculantum chloroform (leaves) extract (leaves) extract H. rosasinensis petroleum ether (leaves) extract

100.00 (0 0) 3 90.00- 75 80.00- > 70.00- o X 60.00- 0 50.00 I- o 40.00- c 30.00- (0 20.00-

0) 10.00- Q. 0.00 5 10 20 Percent concentration

Fig. 7- Comparison of persistance toxicity ofDiplazium esculantum and Hibiscus rosasinensis.

242 On the other hand, least reduction in mortality was observed at 20 percent

concentration of//, rosasinensis petroleum ether extract (Table 71).

The maximum persistence of toxicity 6 days was recorded at 20 percent

concentration of//, rosasinensis (petroleum ether extract). Table data 71 revealed

that other extract of//, rosasinensis persisted only 3 to 4 days at 5 and 10 percent

concentration. Similarly in case of D. esculantum extracts, the persistence was

recorded for only 3 to 45 days.

It showed the (Fig. 7) that H. rosasinensis petroleum ether extract was the

most persisted among the respective concentrations of D. esculantum petroleum

ether and chloroform extracts. At 20 percent concentration, H. rosasinensis

petroleum ether extract recorded. 33.0 percent mortality for first days and their

residue were persisted up to six days, while the residue of other extracts were

persisted 3, 4, 5 days. Among the D. esculantum extracts, the 20 percent

concentration of petroleum ether extracts recorded 30 percent mortality for first

days and their residue were persisted up to 5 days.

Thus, from the above discussion, it was concluded that the use of H. rosasinensis petroleum ether extract could protect the crop effectively. PT values of Cymbopogon Jlexuosus leaves extract:

The survival of larvae in the different treatments was studied by releasing them to in the whorl of treated plants. The release was made everyday, till 100 percent survival was obtained. From the Table 72 and Fig. 8 it was clear that

243 maximum PT value was obtained at 20 percent concentration of petroleum ether extract, while it was minimum at 5 percent concentration of chloroform extract.

The relative performance of different concentration of C. flexuosus extracts with respect to their PT values were as follows.

C. flexuosus extracts (petroleum ether extract) 20 percent in 63.0> C. flexuosus extract (chloroform extract) 20 percent 62> C. flexuosus (petroleum ether extract) 5 percent 52.0> C. flexuosus (petroleum ether extract) 10 percent

45.0> C. flexuosus(chlorofor m extract) 10 percent 35.0> C. flexuosus (chloroform extract) 5 percent 17.0. Percent reduction in mortality:

From the survival of larvae, the percent reduction in the larval mortality was recorded.

It was noted that maximum reduction in mortality was recorded at 5 percent concentration of chloroform extract and least reduction in the mortality of larvae was recorded at 20 percent concentration of chloroform extract (Table 73).

The maximum persistence of toxicity (5 days) was recorded at 20 percent concentration of chloroform extract. The Table 73 data revealed that other tested concentration of extracts persisted to only 3 to 4 days.

It was observed from the Fig. 8 that petroleum persistence toxicity at all the tested levels, when compared to chloroform extract.

244 u VO (N o m >n

en

f<^ m

V) 1 1 p

«*J SB p P p 1 1

0 0 0 p p p f*j •A ^ 0 00 0 fS rn 00 O jg

p p 0 o 0 p o

a o ••- 4> R O O I u^ U-) §• e o I U ft o p o .» s

u u o u e -^^ 3 s 0- < £ «2 o 245 H O o 1^ D- H a. o o o O O o o 00 o oo o 0^ ON o 0^

e:

o o O o o s S5 oo o o o ON ON o ON en o u o

> ^ O ©^ t

.'J u O o 9i ©^ o oo o ON o ON o u B s O u

ON t: o o o O o r- o o o r- oo o S ON ON

S

rn *n If

H Petroleum ether Chloroform leaves extract leaves extract

100.00 CO 90.00 o 80.00^ 3 70.00 > o 60.00- 50.00- Io o 40.00 c (0 30.00 ^ (0 20.00 "8 10.00 0.00 10 20 Percent Concentration

Fig. 8- Comparison of persistance toxicity of Cymbopogon flexuosus stapf.

247 It was clear from the Table 73 that chloroform extracts persisted up to 5

days, while other tested concentrations of extracts persisted only for 4 days except

5 percent chloroform extract.

In general, the finding of residual toxicity of effective non-edible seed oils

and plant extract were in accordance with the finding of Mukherjee and Govind

(1959) and Pant et aL (1965). These finding were also supported by the work of

Teotia and Pandey (1979), who recorded the residual toxicity of petroleum ether

and alcoholic extracts of Acorus calamus L. and malathion as standard to the

adults of S. oryzae at different intervals and observed the reduction of initial toxicity of all extracts even on the 4^ day of spraying of relatively lower but the higher reduction were recorded at Z^ day of spraying.

The results were also found to be in conformity with those of Mukherjee and Govind (1959), who observed that ether, petroleum ether and alcoholic extracts of sweet flag had very little residual toxicity.

In conclusion, it would be said that plant products least persistence in nature. It is due to the fact, they are highly degradable in nature, so, frequent foliar spraying will be required, it may be compensated by their low cost.

The fiitiire of plant derived pesticide in the 21 ** century look very promising as it would be supported by some new bio-active products of known chemistry and physiology. Further research development, promotion and use of natural plant derived pesticides will give the way for ecologically sound management of Chilo awicilius Dudgn.

248 However, still it was doubtful! that any of the material tested could

successfully complete with commercial insecticides. But as a source of material

form which new insecticide and protectants might isolated and identified these

data showed definite leads.

PT values of effective non-edible seed oils:

The survival of larvae in different treatments of A. indica oil and P. pinnata

was studied by releasing them in whorl of plants. The release was made everyday,

till 100 percent survival was obtained. From the data, PT values for each

concentration was calculated (Table 74), It clearly revealed that maximum PT

value (140.0) was obtained at 20 percent concentration of A. indica oil and

minimum (46.9) was at 5 percent concentration of ^. indica oil.

The relative performance of different concentrations of A. indica and P. pinnata in respect to their PT values were as follows:

A. indica (20 percent) 140.0> P. pinnata (20 percent) 105.0> A. indica (10

percent) 96.0> P. pinnata (10 percent) 69.0> P. pinnata (5 percent) 59.0> A.

indica (5 percent) 46.9.

Percent reduction in mortality

It was noted that maximum reduction in mortality was observed at 5 percent concentration of A. indica oil. On the other hand, least reduction in mortality was observed at 20 percent concentration of A. indica oil (Table 75). The maximum persistence of toxicity (7 days) was recorded at 20 percent concentration of A. indica oil. It revealed that 10 percent concentration of A.

249 indica oil persisted for 6 days and 20 percent P. pinnata oil for 5 days while in rest

of the cases, it persisted for 3 to 4 days (Table 75).

It is evident/showed from the Fig. 9 that A. indica and P. pinnata oils at 20 percent concentration were the most persistent. It showed 42.0 and 36.0 percent mortality of larvae for P' days and their residues persisted for 7 and 6 days, respectively followed by 10 percent concentration of respective oils. It was observed that 5 percent concentration of A. indica oil and P. pinnata oil were lost their residue in 3 to 4 days as compared to other concentrations. However, it was found that at 5 percent concentration, persistence toxicity of P. pinnata oil was slightly higher as compared to A. indica oil.

Thus, from the above discussion, it is concluded that A. indica oil and P. pinnata oil could be used as foliar application against C. auricilius larvae and can protect the crop from 5 to 7 days. However, higher concentrations and more number of sprays may be required.

250 VO m -^ »o "*

Ov ON o a. vd o as o OS

o vd

m vo r- >o

1 1 oi

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p p p O o f^ o

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• MM *•• «^ ® 5 o I •to •*- 2 >n o o U-) o o .i^ s U c o o •4-* s 'u.2 *-« ."2 V > e • • 251 s M E n ••3 V •S OS u ft. H

H o o o o o o<_^ o «ri o ^ en o ^ t~-- 00 OS o\

s o o o o o s^ <> VO ^ vd o t^ t^ OS ON o

• mm

o •S a; -a o o o q o ON o ^ 00 o (3 r- 00 ON ON O o

9i

q q o o q q o o o vd o NO 00 o ON S ON ON o 00 i

^ o o o q o q OS NO vd 00 o o 00 ON o s so ON o

q q o o t NO o O 00 00 ON o S

o

•a e en B *H «S f*^ IT) s 00 OH 252 • • H

H A. indica oil P. pinnata oil

150.00 O 140.00 130.00 120.00H > 110.00 100.00H o 90.00 80.00 70.00 I 60.00- o 50.00- c 40.00- 30.00 S 20.00^ 10.00 £ 0.00 0) 5 10 20 Q. Percent Concentration

Fig. 9- Comparison of persistance toxicity of Azadirachta indica oil and P. pinnata oil.

253 f f f f f f f f

ummaru

onciuswn

fri«rfffrfr^fr^^^^fr^;^^^^^ Summary and Conclusion

Indiscriminate and injudicious uses of synthetic insecticides in the past five

decades have posed serious problems to our pest management programme in the

field as well as in the storage. These problems lead to initiate a search for the non-

hazardous chemicals in which the naturally available plant resources are the

foremost.

The present investigations were planned keeping in view of all the above

factors with the aim to find out some suitable plant derivatives having good

ovipositional deterrent, repellent activity, ovicidal and insecticidal activity against

Chilo auricilins Dudgeon. Which can be exploited to decrease our dependence on

synthetic pesticides. The selectivity of these bioactive products makes them

valuable in IPM of Chilo auricilius.

Studies on the effect of four non-edible seed oils and extracts from the various

parts of 15 locally available plants on Chilo auricilius were carried out under

laboratory conditions to determine their following activities :-

a) To determine the effect of the oviposition behaviour of the Chilo auricilius.

b) To determine the insecticidal effects on larvae of the target insect Chilo

auricilius. c) To determine the ovicidal effect on old eggs of Chilo auricilius. d) To assess toxicity of active plant products and non-edible seed oils. e) To assess residual toxicity of active plant products and non-edible seed oils.

254 All the experiments were carried out at control temperature (27 ± 2 C) and

relative humidity (75 ± 5%).

The following non-edible seed oils and plants were used for their biological

efficiency.

A. Eucalyptus globulus, Callistemon citrinus DC, Bongainvillea spectibili (wild)

Azadirachta indica, Murya koenigii. Cannabis sativa, Callotropis procera

(Wild), Thuja compacta, Lantana camara (Linn), Nerium indicum, Rauvalfia

serpentine Benths, Hibiscus rosasinensis, Diplazium esculantum (Retz),

Cymbopoganflexousus (Stapf) and Mantha piperata.

B. Azadirachta indica, Pongamia pinnata, Ricinus communis and Madhuca

longifolia.

The sequential extraction of plant parts were carried out in Sachet extractor

using different solvent in sugarcane as follows: Petroleum ether. Chloroform,

Methanol and Distilled water, while oils were extracted with crushers after

decortication.

Listed plant extracts used in the experiment showed absolute ovipositional

deterrent effective. Methanol extract ofE. globulus leaves. Petroleum ether extract

of B. spectibili flowers. Petroleum ether extract of C. procera leaves. Petroleum

ether and Chloroform extracts ofN. indicum leaves extract.

The salient fmdings were as follows:

Among the non-edible oils, A. indica oil and P. pinnata oil proved as ovipositional deterrent. The maximum number of eggs were found on R.

255 communis and M longifolia oils.

The following plant parts extracts gave the highest reduction in viability of eggs, deposited on respective treated strips/sectors i.e. E. globulus, C. procera leaves, N. indicum (leaves), D. esculantum leaves, T. compacta and B. spectibili.

All treated oils (A. indica, P. pinnata, R. communis and M. longifolia) gave the significant reduction in the viability of eggs, which were deposited on the respective treated strips/sectors.

The hatching period of eggs in the following treatments (plant extracts treated strips/sectors/non-edible seed oils) increased the days from the normal hatching period of eggs of C. auricilius. It was recorded in feeding method that A. indica was most polent followed P. pinnata oil in reducing the survival of larvae.

The various plant parts extract gave significant reduction in survival of larvae. B. spectibili (leaves & flowers), C. procera (leaves), C. citrinus (leaves) and N. indicum leaves.

In general, it was found that three days old eggs were found to be the most susceptible when compared to two and one day old eggs of C. auricilius. In plant extracts B. spectibili, A. indica, N. indicum, C. citrinus, T. compacta, E. globulus, gave the highest reduction in survival of three days old eggs of C. auricilius, while, A. indica oil and P. pinnata gave the highest mortality of three days old eggs.

LC30 and LC50 were found to be the best at all levels of B. spectibili

(flowers), while LC90 was the most effective at all levels of ^4. indica leaves (3 to 4

256 days old larvae). In order to relative toxicity P. pinnata followed by A. indica oil, was found to be the lowest at all the LC levels when compared to the standard insecticide, Endosulfan, H. rosasinensis (leaves) extract gave maximum residual toxicity 7 days while A. indica oil showed the maximum residual toxicity 8 days amongst tested non-edible oils.

257 flff'ff^^^^^^^^^'ff^^'f^'fff f f f f f f f f f f f f f f f ererences f f f f f f f f f f f f f f f f -frfr-frfr'ff'ff'ff'fffr'fr'fr'fr'fr-fr'ff'fr'fr'f References

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