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Evaluation of Biopesticides and Biorationals against Thrips and Leafminer in Rabi/Summer Groundnut

Abstract

Field experiment was conducted during R abi /Summer cropping season of 2012 - 13 at Main Agricultural Research Station, University of Agricultural Sciences, Dharwad with the objective of evaluating the efficacy of different biopesticides and biorational s against groundnut thrips and leaf miner. The treatments were Lecanicillium lecanii, Beauveria bassiana, Metarrhizium anisopliae @ 2, 4, 6 g/l, Buprofezin 25 EC @ 1ml/l and Spinosad 45 SC @ 1 ml/l. During the study efficacy of all three biopesticides were evaluated at different dosages. Results revealed that spinosad 45 EC @ 0.20 ml/l, Lecanicillium lecanii @ 6 g/l and L. lecanii @ 4 g/l found effective in reducing thrips population, whereas spinosad 45 EC @ 0.20 ml/l, buprofezin ( 25 EC @ 1.0 ml/l) , Beauve ria bassiana @ 6 g/l and Metarrhizium anisopliae @ 6 g/l found effective against leaf miner. Considering the cost of cultivation and the gross profit in different treatments, the benefit cost ratio (BCR) and net profit was calculated. Among the different t reatments, spinosad and buprofezin recorded higher B:C ratio net profit and found superior over all other treatments in the trial. Among the biopesticides L . lecanii @ 6 g/l recorded higher B:C ratio and net profit as compare to other biopesticides treatme nts.

Hanamant Gadad  and Mahabaleshwar Hegde

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