Field bioefficacy of insecticide pre mix (Chlorpyriphos 50% + Cypermethrin 5% EC) against major insect pests of cabbage

Field experiment was conducted during rabi season at MARS, Raichur, Karnataka to study the efficacy of premix insecticide against aphids, diamond back moth and Spodoptera exigua infesting on cabbage. Experiment was laid out in Randomized Block Design with eight treatments including control. Insecticides used in the experiments were Chlorpyriphos 50% + Cypermethrin 5% EC @ 1000+100, 500+50, 375+37.5 and 250+25 g a.i./ha, Chlorpyriphos 20% EC @ 400 g a.i./ha, Cypermethrin 10% EC @ 70 g a.i./ha, Fipronil 5% SC @ 50 g a.i./ha. Among the insecticides tested chlorpyriphos 50% + cypermethrin 5% EC @ 1000+100 g a.i./ha in recording minimum larval population per plant both in diamond back moth and Spodoptera exigua and was superior compared to rest of the treatments. The treatments chlorpyriphos 50% + cypermethrin 5% EC @ 1000 ml/ha and its next lower dosage treatment @ 750 ml/ha were on par with each other which recorded larval population and aphids. Chlorpyriphos 50% + cypermethrin 5% EC @ 2000 ml/ha recorded minimum damage of 2.29, 2.54 per cent with highest yield (23.81 q/ha in 2015-16) and (22.86 q/ha in 2016-17) respectively. The next best treatment at all doses followed by Chlorpyriphos 50% + cypermethrin 5% EC was Cypermethrin 10% EC @ 760 g a.i./ha.