Effect of biopesticides applied separately or together on nutritional indices of the rice leaffolderCnaphalocrocis medinalis |
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| Authors: | S Senthil Nathan Paul Gene Chung K Murugan |
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| Institution: | (1) Dept. of Environmental Engineering, Chonbuk National University, 561 756 Jeonju city, Chonbuk, South Korea;(2) Dept. of Zoology, Bharathiar University, Coimbatore, 641046 Tamilnadu, India |
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| Abstract: | Laboratory assays were done to evaluate the effect of neem seed kernel extract (Azadirachta indica A. Juss),Vitex negundo L. (Lamiales: Verbenaceae) leaf extract, andBacillus thuringiensis (Berliner), applied separately or together, on nutritional indices of the rice leaffolderCnaphalocrocis medinalis (Guenée) (Lepidoptera: Pyralidae). All three biopesticides suppressed feeding and larval growth and low concentrations affected
the larval performance. The combined effect of the three biopesticides resulted in a considerable decrease in nutritional
indices, indicating strong deterrence. Dose response relationships were established with respect to frass production and larval
growth. The efficiency of conversion of ingested and digested food was considerably reduced. |
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| Keywords: | Biopesticides Bt neem Vitex Cnaphalocrocis medinalis nutrition physiology |
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