New insecticide molecules and entomopathogens against Hadda beetle, Henosepilachna vigintioctopunctata infesting vegetable cowpea
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Keywords:Cowpea, Henosepilachna vigintioctopunctata, bioefficacy, new insecticides, entomopathogens
Laboratory and field experiments on the efficacy of novel insecticide molecules and entomopathogens to haddaÂ beetle, Henosepilachna vigintioctopunctata were conducted at Indian Institute of Vegetable Research, VaranasiÂ for two seasons during 2010-11. Chlorantraniliprole 18.5 SC @ 150 g a.i /ha and thiacloprid 21.7 SC @ 70 g a.i.Â /ha exhibited ovicidal action with lowest per cent egg hatching. Imidacloprid 17.8 SL @ 25 g a.i. /ha and thiaclopridÂ 21.8 SC @ 70 a.i. /ha were found to be most effective against grub and adult stages of hadda beetle and recordedÂ highest per cent mortality when tested by leaf residue method. Among the biopesticides viz., Metarhizium anisopliaeÂ (1x108 cfu/g) and neem oil provided highest protection over control and indicated compatibility and synergisticÂ activity at 1:1 combination. Emamectin benzoate 5 SG @ 10 g a.i. /ha and thiodicarb 75 WP @70g a.i. /ha provedÂ to be the most effective with highest reduction in pest population of 75.3 and 73.9%, respectively under fieldÂ conditions.
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