Bio-efficacy of some insecticides against H. armigera (Hubner) on chickpea (Cicer arietinum L.)

Chickpea‘SAKI9516’ was sown on Agricultural Research Farm of Banaras Hindu University during Rabi season 2010–11 and 2011–12 for the bio-efficacy of certain new molecules insecticides viz., HaNPV@250 LE/ha, spinosad 45SC@ 100 g a.i./ha, fenvalerate 20 EC @ 300 g a.i./ha, quinalphos 25EC @ 450 g a.i./ha, emamectin benzoate 5SG @ 11 g a.i./ha, azadirachtin 1500 ppm@5ml/lit, cartap hydrochloride 50 SP @ 500 g a.i./ha, fiproni 15 SC @ 50 g a.i./ha and indoxacarb 14.5 EC @ 75 g were applied twice at 15 days interval against gram pod borer, H. armigera. Spinosad was found best among all the treatments with 81.2% reduction in larval population over control followed by indoxacarb, fipronil, emamectin benzoate, cartap hydrochloride, fenvalerate, and quinalphos, azadirachtin and HaNPV. After 7 days of spraying of second application, spinosad was found best again in reduceding 79.8% larval population followed by indoxacarb (with 78.3% reduction in larval populations). The highest yield was obtained in spinosad (1.79 t/ha) while low in azadirachtin (1.06 t/ha). The cost:benefit ratio was high in treatment fipronil (1: 8.2) while low in treatment indoxacarb (1: 5.3).