Bioefficacy of Insecticides against Sucking Pests on Soybean Crop

A field experiment was laid out in Randomized Block Design with six treatments including untreated control replicated four times. This crop was sown on 4th July 2010 in plot size of 25 square meter. In this experiment numbers of sucking pests were counted on the randomly selected five plants on which five leaves were taken three from upper and two from bottom in each plot. Observations were recorded 24 hours before the spraying of insecticides and after 24 hours, 3 days, 5 days, 7 days and 10 days of spraying of insecticides. Thiacloprid 240 SC, when applied as foliar spray at the rate of 180 g a.i./ ha was most effective against the sucking pests with minimum 1.8 insects/ plant, highest grain yield of 32.4 q /ha, 42% avoidable losses and 1.74:1 benefit cost ratio. It was followed by Thiacloprid 240 SC @ 150 g.a.i./ha.