Ecology, Environment and Conservation Paper

Vol. 21 Dec. 2015 Suppl. Issue; Page No.(81-85)

SEASONAL ABUNDANCE AND EVALUATION OF NEW INSECTICIDES AGAINST RICE LEAF FOLDER CNAPHALOCROCIS MEDINALIS (GUENEE)

D. Rakshith Roshan, S.V.S. Raju and Sourab Sharma

Abstract

Rice is widely grown cereal crop in India. In the recent past leaf folder Cnaphalocrocis medinalis (Guenee) has assumed major pest status in certain areas due to increased use of insecticides on rice crop. An experiment was conducted to know the effect of abiotic factors on incidence of leaf folder and also to study the bioefficacy of certain new insecticides namely imidacloprid 17.8SL, fipronil 5 SC, acetamiprid 20 SP, acetamiprid 15 + fipronil 60 WDG, fipronil 80 WG, chlorpyriphos 20 EC, monocrotophos 36 SL were studied. The correlation studies between the C. medinalis population and weather parameters revealed a significant positive correlation with evening RH, average relative humidity. A non significant positive correlation was observed with rainfall and morning humidity. Among the insecticides acetamiprid 15 + fipronil 60 WDG, a combination of neonicotinoid and phenyl pyrazole was observed as significantly best treatment over the other treatments.

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