Evaluation of Nematophagous Fungi Dactylaria Brochopaga and Arthrobotrys Dactyloides Against Meloidogyne Incognita Infesting Peanut Plants Under Field Conditions
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AGRICULTURE AND BIOLOGY JOURNAL OF NORTH AMERICA ISSN Print: 2151-7517, ISSN Online: 2151-7525, doi:10.5251/abjna.2014.5.5.193.197 © 2014, ScienceHuβ, http://www.scihub.org/ABJNA Evaluation of Nematophagous fungi Dactylaria brochopaga and Arthrobotrys dactyloides against Meloidogyne incognita infesting peanut plants under field conditions Noweer E.M.A.1 and Mona E.M. Al-Shalaby2 1- Nematology Laboratory, plant pathology Department, National Research Center, Dokki, Giza, Egypt. 2- Department of Zoology and Agricutlural Nematology, Faculty of Agriculture, Cairo University, Giza, Egypt. ABSTRACT The nematicidal activity of the nematode-trapping fungi Dactylaria brochopaga and Arthrobotrys dactyloides in their compounds named (Dbx-1003) 20% and (Adx-1004) 20% respictevely to control Meloidogyne incognita infesting peanut plant Arachis hypogaea L. CV. Giza 5. were evaluated under field conditions in Egypt. Each compound were added to the soil in two forms once as a liquid using two concentrations 20,40 liter/feddan after germination. And the other treatments were added to the soil as granules around the peanut seed plants at planting time at rates of 100, 200 kg/feddan. A treatment without any addition was used as check treatment. Data indicated two months after application that population densities of M. incognita in soil were significantly reduced in all treatments compared with control, as well as gall formation on peanut roots. The highest reduction in the nematode counts in soil and root galls was recorded with the application of fungus D. brochopaga. Four months after treatments at the end of growing season the percentages reduction were increased espicaialy with using granules of the two fungus. Peanut yield was significantly increased due to the addition of the two fungus to the soil, especially when applied at higher dosage levels. Key Words: Nematode-trapping fungi - Dactylaria brochopaga - Arthrobotrys dactyloides - Meloidogyne incognita – Peanut - Field conditions. INTRODUCTION Monacrosporium bembicode were tested by Duponnois et al., (1997) for their trapping ability Hertz (1992) reported that conidia of Arthrobotrys against Meloidogyne mayaguensis. Most of the oligospora germinated directly into adhesive traps when Arthrobotrys strains and one Dactylaria strain applied close to cow faeces on water agar plates. The decreased development of the nematode in tobacco conidial trap is considered a survival structure enabling plants. They found that the growth of the tobacco the fungus to overcome fungistasis. Traps adhere to the plants was consequently improved this refer to that surface of passing nematodes, could facilitate spread of certain fungi have proper phytostimulant effects by the fungus, before penetrating the nematode cuticle and acting on the soil structure through commensalism immobilization of the nematode take place. The mechanisms with the plant roots. nematophagous A. oligospora which can live saprophytically as well as predatorily, forms sticky The fungus Dactylaria brochopaga proved to be an reticulate traps in the presence of living nematodes effective nematode antagonist and this may be due to kill and consume them (Scholler and Rubner, to the effect on nematodes population larvae through 1994). Timper and Brodie,(1993) found that production of traps which captured the nematode Arthrobotrys dactyloides, A. oligospora, Monacrosporium larvae, dissolving its outer culticle and then digesting ellipsosporim and M. cionopagum, fungi killed most of the inner contents of the victim (Aboul-Eid et al., the Pratylenchus penetrans adults and juveniles added 2002). to the fungus cultures. Arthrobotrys oligospora, A. Conoides, Dactylaria Shelensis, Dactylaria sp. and Agric. Biol. J. N. Am., 2014, 5(5): 193-197 Recently this fungus has been developed and decanting techniques. Root samples were incubated formulated in a compound named, Dbx-1003 (20%). in tap water for 7 days for egg mass hatching. The Therefore, the objective of this study was to evaluate number of galls on roots was also recorded. The the effects of both nematode-trapping fungi, reduction % of nematode in soil was calculated Arthrobotrys dactyloides and Dactylaria brochopaga in according to Handerson & Tilton formula (Puntener, their compounds named Adx-1004 20% and Dbx -1003 1981). Number of root galls per 5 gm. roots were 20% respectively against the root-knot nematodes M. also determined. At the end of season plants were incognita infecting peanut cv. Giza 5 under field removed and data on plant growth (weights of fruits, conditions in Egypt. shoots,and roots) of peanut were recorded. MATERIAL AND METHODS Statistical analysis: Data were analyzed following standard procedures for analysis of variance. This work was carried out in sandy soil with natural Differences between means were evaluated for infestation of root-knot nematode Meloidogyne significance according to Duncan's New Multiple incognita through the period of May to September Range Test at the 5% and 1% level of probability 2009 in Mansouria village, Giza Governorate, Egypt. using MSTAT Version 4 (1987). The area of the experiment was 1. kirate(175m)for each RESULTS: treatment, the seed of peanut Arachis hypogaea L.CV. Giza 5. were planted in the soil in May 2009. The Effects of the nematode trapping fungi on following treatments were applied to the soil as follows: M.incognita larvae in soil: Numbers of root-knot Dbx-1003 (20%) as a liquid containing Dactylaria nematodes M.incognita larvae before treatment in brochopaga fungi and ADX-1004 (20%) containing May 2009, after tow month in july 2009 at Mid Arthrobotrys dactyloides fungi were applied once to the Season and at end of the growing season in soil at the rate of 1 litre/kirate (20 litre/feddan) and at the September 2009 were recorded in Table 1. Data rate of 2 litre/kirate (40 litre/feddan) these treatments showed that the expression of nematicidal activity were added to the soil around the peanut plants at varied with type of application, concentration and previous two concentrations. The first concentration time of exposure. Two months after treatments in prepared by diluted 1 litre from two liquid component in July 2009 (Mid season) population densities of M. 49 litre of water and the second concentration was incognita in soil were significantly reduced by all prepared by diluted 2 litre from two component in 48 treatments compared with untreated control. As the litre of water, then two concentrations added to the soil reduction percents recorded were 63% and 83% at the rate 25 ml/plant after completely germination with the application of D. brochopaga (Dbx- compontent Dbx-1003 (20%) and ADX-1004 (20%) as 1003)liquid and were 76% and 74% with Dbx-1003 agranules. The spores of two fungus was carried on granules. These percents increased by the end of the vermoculite substrate. Treatments were applied once to growing season where they reached 85% , 93% for the soil at the rate 5kg/kirate (100 kg/feddan) and at 10 liquid form and 92%, 93% for granules form. As for the kg/kirate (200 kg/feddan) and mixed to the soil around fungus A. dactyloides (ADX-1004) the reduction the plants after 15 days from planting. percents recorded in Mid season were 65% and 74% by 1&2 liter concentration respectively for liquid form Untreated plants as check treatments. Each and 79% and 77% by the 5&10 Kg concentration treatment was replicated ten times. All treatments respectively for granules form. On the other hand in the were completely randomized. Also chemical end of the growing season the reduction percents were fertilizers and all other culture ractices were made 77% and 89% by the liquid form 1&2 liter concentration according to the technical recommendations of respectively and 90% and 94% by the granules form peanut growing. Irrigation was executed. Soil 5&10 Kg concentration respectively . samples were taken at three intervals; before adding the tested materials May 2009 (the initial population),Mid season (after two months, July 2009) and the end of growing season (after four months, september 2009). Also root samples were taken in mid season and the end of the growing season. Soil samples were extracted by using sieving and 194 Agric. Biol. J. N. Am., 2014, 5(5): 193-197 Table (1): Effects of D. brochopaga (Dbx-1003) 1 Liter 114 49.2 98 63.2 and A. dactyloides (ADX-1004), a nematode 2 Liter 165 26.5 87 67.3 5 k.g. 88 60.8 62 76.7 trapping fungus on M. incognita Larvae in soil. 10 k.g. 24 80.3 45 83.1 Check 224.5 - 266 - No. of Juveniles/1 kg soil L.S.D. End of the 0.05 45 - 42 - Mid season Treatments Initial growing season 0.01 65 - 67 - population No. of No. of Red. % Red. % No. of galls in treatment J2 J2 Red % = 1- X 100 DBx-1003 No. of galls in check 1 liter 1256 810 63 422 85 2 liter 2120 625 83 316 93 5 k.g. 1930 816 76 344 92 Effects of nematode trapping fungi on peanut 10 k.g. 1410 624 74 218 93 ADX-1004 yield: Besides reducing nematode infestation, the 1 Liter. 2105 1200 65 890 77 biocontrol agents also enhanced the plant growth 2 Liter. 3120 1315 74 624 89 parameters (Table 3). It is evident from the table that 5 k.g. 2875 965 79 535 90 all treatments improved the Shoot and Root fresh 10 k.g. 1870 670 77 214 94 Check 1659 2725 - 3065 - weight of the plant, weight of peanut pods per plant L.S.D. and peanut yield per feddan. 0.05 - 412 - 514 - 0.01 - 624 - 710 - As shwon in Table 3 application of granules form fa two fungi more effective than that of liquid form. No. in treatment after No. in check Reduction % = application before X X 1- No. in treatment No- in 100 Table (3): Effects of D.