Bio-efficacy of different insecticides against leafhopper (Amrasca biguttula biguttula) on sunflower

Abstract

The present field experiment were conducted to evaluate “Bio-efficacy of different insecticides against leafhopper (Amrasca biguttula biguttula) on sunflower” under field condition during rabi season of 2017 at research farm of Oilseed Research Station, Latur, Maharashtra, India. The observations on total number of leafhoppers were recorded on top, middle and bottom leaves of five randomly selected plants from each treatment at one day before and 1, 3, 7, 10 and 14 days after first and second application of insecticides. The treatments of different insecticides viz., thiamethoxam 0.005 per cent, imidacloprid 0.00356 per cent, spiromesifen 0.02748 per cent, flonicamide 0.02 per cent, profenophos 0.1 per cent and triazophos 0.08 per cent were evaluated against leafhopper, Amrasca biguttula biguttula revealed that imidacloprid 0.00356 per cent was found most effective treatment in reducing the population of leafhopper (1.07 and 0.73 leafhoppers per 6 leaves) followed by thiamethoxam 0.005 per cent. Significantly higher seed yield (2450 kg/ha) of sunflower was recorded in treatment imidacloprid 0.00356 per cent however, it was found at par with treatment thiamethoxam 0.005 per cent (2264 kg/ha). The highest ICBR (1:20.42) was recorded with treatment imidacloprid which was followed by thiamethoxam 0.02 per cent (1:17.32).