Compatibility of entomopathogens with biorationals and insecticides against major insect pests of green gram
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Date
2020-11
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G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand)
Abstract
The present investigation was conducted during kharif season of 2019-20 at Norman. E. Borlaug. Crop Research Centre of G.B. Pant University of Agriculture and Technology, Pantnagar (Uttarakhand) and Insect Pathology Laboratory, Department of Entomology, and Central Analytical Laboratory, Department of Soil Science, with the objective to test compatibility of B.bassiana and B.thuringiensis with botanical insecticides, insect growth regulators (IGRs) and with chemical insecticides. Field trial was conducted to evaluate the efficacy of combinations of entomopathogens with biorationals and chemical insecticides against major insect pests of green gram. Compatibility study of B.bassiana with different biorationals and chemical insecticides indicated that buprofezin, thiamethoxam, pyriproxifen were found compatible with B. bassiana at recommended dose, while azadirachtin was found incompatible with B. bassiana. Compatibility study of B. thuringiensis with different biorationals and chemical insecticides showed that M. azedarach poisoned media exhibited minimum inhibition and found higly compatible to B. thuringiensis population growth at all its lethal and sublethal doses followed by thiamethoxam 25WG, chlorantraniliprole 18.5SC, buprofezin 25SC, pyriproxifen 10EC and lambda cyhalothrin 5EC while azadirachtin 10000 showed maximum inhibition to growth of B.thuringiensis at all of its lethal and sublethal doses. Combinations of entomopathogens with biorationals and chemical insecticides were evaluated against major insect pests (S.litura, S.obliqua and M.vitrata) of green gram in field conditions. Bacillus thuringiensis in combination with other insecticides was found more effective to combat the lepidopteran’s population than B. bassiana. The combinations like B. thuringiensis + chlorantraniliprole 18.5SC, B. thuringiensis + azadirachtin 10000ppm, B. bassiana + chlorantraniliprole 18.5SC and B. bassiana + azadirachtin 10000ppm were found more effective against S. litura, S. obliqua and M. vitrata while B.bassiana+ buprofezin combination was found least effective