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Bio-efficacy of some newer insecticides and bio-pesticides against whitefly (Bemisia tabaci Gennadius) in Brinjal ecosystem

Efficacy of different treatments viz., imidacloprid 17.8 SL, buprofezin 25 SC, fipronil 5 SC, spinosad 45 SC, emamectin benzoate 5 SG, Bacillus thuringiensis, and neem oil 1500 ppm was carried out to study the relative efficacy of some newer insecticides and biopesticides against whitefly (Bemisia tabaci Gennadius) in brinjal ecosystem. All the treatments were found significantly effective in reducing the population of whiteflies and thus increasing the yield as compared to control. Imidacloprid 17.8 SL @ 100ml/ha was found to be the most effective treatment in reducing the population of whitefly. The B. thuringiensis @ 1.0kg/ha was found less effective as compared to chemical treatments but it was significantly superior over control. The highest fruit yield (135.8 q/ha) was obtained in spinosad 45 SC but cost benefit ratio (1:11.50) was higher in imidacloprid 17.8 SL. Observations revealed that, there was no record of any phyto-toxicity symptoms on brinjal plants with dosages of Imidacloprid 17.8 SL, Spinosad 45 SC and neem oil. From the experiment, it was confirmed that Imidacloprid 17.8 SL is effective in the management of whitefly in brinjal without hindering natural enemy population and causing phyto-toxicity effect.