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Effect of Neem Kernel Aqueous Extract (NKAE) on Growth and Development of Red Slug Caterpillar, Eterusia Magnifica Butl in Tea in North-East India, India

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Effect of Neem Kernel Aqueous Extract (NKAE) on Growth and Development of Red Slug Caterpillar, Eterusia Magnifica Butl in Tea in North-East India, India NKAE on red slug caterpillar Journal of Biopesticides, 3(2): 489 - 494 (2010) 489 Effect of neem kernel aqueous extract (NKAE) on growth and development of red slug caterpillar, Eterusia magnifica butl in tea in North-East India, India Rimpi Das, *B. C. Chutia, M. Sarmah, A. Rahman ABSTRACT Aqueous extract of neem seed kernel (NKAE) was tested in laboratory conditions to evaluate its effects on larval weight, larval duration, mortality percent, adult emergence percent and antifeedant activity against red slug caterpillar, Eterusia magnifica (Lepidoptera: Zygaenidae).Different concentrations of NKAE as 2,4,6,8 and 10% were used separately to evaluate the effects of NKAE. NKAE was found to be effective and concentration dependant against Eterusia magnifica. Larval weight was concentration dependant and decreased with the increase of NKAE concentrations. Antifeedant activity was in ascending order with increase in concentrations. The highest leaf area consumed were recorded at 2% concentration in fifth instar as 1158.6+254.79 sq cm and it was lowest at 8% concentration in first instar larva as 92.2+26.04 sq cm. The leaf area protection of NKAE was recorded as 48.09+12.61-61.59+11.28% in first, 22.74+13.59-54.31+14.16% in second, 60.05+11.94-87.5+2.98% in third, 33.9+10.79-65.82+15.71% in 4th and 30.32+10.2-64.48+19.35% in 5th instar larva at 2-10% concentrations respectively. Preference index obtained for NKAE in all tested concentrations indicated its deterrence against feeding of red slug caterpillar. The larval duration recorded maximum as 5.8+0.45, 6.6+0.55, 7.6+0.55, 7.6+0.55 and 13.6+2.1 days at 8 percent concentrations over control as 4.4+0.55, 5.4+0.54, 5.6+0.55, 6.6+0.55 and 10.6+1.7 days in 1st, 2nd, 3rd, 4th and 5th instar larva respectively. The larval mortality was maximum after 72 hrs of treatment at all the concentrations and recorded 12.92+0.02-98.23+2.1% in 1st, 9.07+0.4 - 39.4+2.2% in 2nd, 7.53+0.7 – 32.63 +0.8% in 3rd and 2.59+1.0 – 11.9+0.6% in 4th instar at 2, 4, 6, 8 and 10 percent concentrations of NKAE respectively. Adult emergence percent was reduced to 0-35.63+1.7 in male and 0-29.4+1.1 percent in female at 8-2 percent concentrations as against 99.1±0.6 and 97.6+0.5 respectively in the untreated control. Key words: Tea, Neem Kernel Aqueous Extract, Eterusia magnifica (Red Slug Caterpillar), Antifeedant INTRODUCTION various efforts have been made by using conventional Tea, Camellia sinensis (L.) O. Kuntz is one of the most synthetic pesticides. The annual consumption of important commercial crop covering an area of 5.07 lakh insecticides in North-East India alone ranged from 7.35 to hectare in India producing annually 8.54 million kg made 16.75 kg/ha (Barbora and Biswas, 1996). Applications of tea. Among the various constraints of tea production in such huge quantity of pesticides cause various problems North-East India, the problem of insect pests is of major such as resistance problem, deleterious effects on natural importance. More than one hundred species of arthropod enemies, up setting of ecological balances and pests are known to attack tea in North-East India (Das, accumulation of pesticide residue on made tea. 1965). In North East India, tea plant is colonized by a Considering ill effects caused by large scale and complex of insect species including the tea mosquito bug, indiscriminate usage of pesticides, presently thrust has red, pink, and purple mites, thrips, termites, red slug been given on bio-rational approaches to develop an caterpillar, looper caterpillar, green leaf hopper and so on. effective management strategy for this periodical serious Among the chewing pests, Eterusia magnifica pest. Among the natural insecticides investigated in recent (Lepidoptera: Zygaenidae) also known as red slug years, the constituents of neem tree (Azadirachta indica caterpillar is widely distributed and is considered as one Juss: Meliaceae) have shown great promise in controlling of the productivity barriers in teas which caused periodical numerous (nearly over 200 species) insect pests of menace mostly during the flushing period and attaining cultivated crop plants (Mithyantha and Shankar, 1999; peak during March-July (Das, 1965). To control this pest Vyas and Mistry, 1999). Neem (A. indica) is claimed to be © JBiopest. 191 Rimpi Das et al. 490 effective against a variety of insects, nematodes, bacteria, different concentrations of the aqueous extract by using fungi and viral diseases and is reported to be effective glass atomizer, allowed to dry under mild fan for about against over 300 pest species (Mithyantha and Sankar, five minutes, and placed in a glass petridis (20 cm diameter) 1999). In recent years, several reviews have been with moist filter paper at the bottom. One prestarved larva published which out line the use of A. indica as a was released in each petri plate. Each treatment was botanical insecticide (Jacobson, 1989; Koul et al., 1990; replicated five times at room temperature. Actual leaf area Schmutterer, 1990; Ascher, 1993; Casey Scalar, 1998). The consumed, percent area protection due to treatment over compounds from neem have a number of properties useful control and preference index were calculated (Kogan and for insect pest management. These include toxicity, Goedon, 1970) after 48 hours. repellence, feeding and oviposition deterrence, insect’s inconsumedArea - treatmentconsumedAreaControl protectionareaPercent = 100X growth regulatory activity etc. (Schmutterer, 1990 and controlinconsumedArea Koul, 2004). The mode of action of Azadirachtin, the 2 ionconcentrattestonfeedingX principal insecticidal constituents of neem oil has only )PI(indexeferencePr = + controlonfeedingionconcentrattestonFeeding been elucidated (Mordue and Blackwell, 1993). Within the Azadirachtin molecule, the decalin fragment is responsible Where PI > 1 - preference for test concentration for the insect growth regulation and developmental PI < 1 - deterrence against feeding effects, while the hydroxy furan fragment causes the PI = 1 - feeding on test concentration equals control antifeedant effect more widely observed among the target species (Aldhous, 1992). Impact of NKAE on mortality of red slug caterpillar Neem extracts including Azadirachtin are known to deter Healthy mature tea leaves were subjected to different feeding in Schistocerca gregaria (Pradhan et al., 1962; concentrations of NKAE by using glass atomizer and Butterworth and Morgan, 1971). Saxena et al. (1981) treated leaves were allowed to dry under mild fan about reported repellency and feeding deterrency of neem oil to five minutes. On each treated leaf, one larva was released brown plant hopper. Although, good numbers of with the help of camlin hair brush from the culture and references on record about neem and neem-based placed in a glass Petri plate (20 cm diameter) with moist formulation have been tried to control various insect pests filter paper at the bottom. Each treatment was replicated over the world (Vyas and Mistry, 1999; Dhawan, 1999; fifteen times. The individuals of red slug caterpillar were Dhawan and Simwat, 1999; Dhaliwal et al., 1999; Singh et recorded for up to 72 hours at 24 hours of interval. Percent al., 1999). But no systematic work has been reported on mortality was calculated by using the following formula- - populationtreatmentpostpopulationtreatmentePr effect of NKAE against red slug caterpillar in North-East mortalityecentPr = 100x India. Hence an attempt has been made to study the populationtreatmentePr effectiveness and utilization of NKAE against red slug caterpillar. RESULTS AND DISCUSSION The result presented in Table-1 indicated the effect of MATERIALS AND METHODS NKAE treated in different concentrations on larval weight Preparation of neem kernel aqueous extract: The of red slug caterpillar. NKAE had a great impact on larval collected neem seed kernels (NSK) were ground to fine weight of red slug caterpillar. Result showed that the larval powder with the help of mixer grinder. The powdered weight was concentration dependant, larval weight materials were passed through 60 mesh sieve. Then 10 decreased with the increase of NKAE concentrations. grams of NSK materials were dissolved in 100 ml of water Coudrier et al. (1985) also observed that neem seed extract and kept it for over night. The dissolved NSK materials prolonged larval development and induced larval mortality were filtered through Whatmen filter paper. The filtered of Bienisia tabaci on cotton foliage. liquid portion was taken as a stock solution for preparing Antifeedant activities of NKAE against different larval different concentrations. instars of red slug caterpillar are summarized in Table-II. Antifeedant activity was in ascending order with increase Antifeedant activity of NKAE against Red slug in concentrations. The leaf area consumed was highest caterpillar: Fresh mature leaves were collected from the 1158.6+254.79 sq cm at 2% concentration in 5th instar and field, washed thoroughly under tap water and dried under it was lowest at 8% concentration in 1st instar larva as fan for ten minutes. Before spraying the NKAE, the area 92.2+26.04 sq cm. similar experiment also initiated by of the mature leaves were measured by using graph paper Yoshida and Toscano (1994) and found that the relative treatment wise. The leaves were then sprayed with consumption rate of Heliothis virescence larvae treated NKAE on red slug caterpillar 491 Table 1. Effect of NKAE on larval weight of Red Slug Caterpillar Treatments Weight (gm) of larva in different days of observation (Mean + SD) 1st 2nd 3rd 4th 5th Control 0.007+0.005 0.023+0.007 0.143+0.06 0.703+0.13 1.587+0.14 NKAE (2%) 0.003+0.002 0.0031+0.0008 0.026+0.01 0.688+0.13 1.520+0.08 NKAE (4%) 0.002+0.001 0.003+0.0009 0.005+0.002 0.676+0.12 1.439+0.05 NKAE (6%) 0.002+0.001 0.002+0.0006 0.004+0.001 0.620+0.08 1.430+0.05 NKAE (8%) 0.001+0.0004 0.001+0.0004 0.003+0.001 0.615+0.23 1.419+0.05 CD (P = 0.05) 2.41 1.004 0.024 0.104 0.078 with azadirachtin was 25 % of the control.
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