MANOJ MAHLA, O.P. AMETA, HEMANT SWAMI AND ANIL VYAS

Bioefficacy of newer insecticidal molecule was studied against thrips, Thrips tabaci (Linnman) infesting cotton. Fipronil 200 SC at 375 ml/ha caused the highest 68.55, 70.63, 64.67; 80.73, 93.65, 88.76 and 64.63, 72.27, 68.19; 80.81, 92.89 and 89.88 percent reduction of thrips followed by Fipronil 200 SC at 300 ml/ha. which caused 51.78, 59.64, 56.67; 75.84, 89.83, 82.41and 46.78, 54.61, 51.65; 75.61, 88.95 and 84.46 percent reduction at 3, 7 and 10 days after first and second spray during 2011 and 2012, respectively.The insecticidal treatment Regent 5% SC at 1500 ml/ha and Imidacloprid 200 SL at 125 ml/ha also recorded lower population of thrips and was significantly superior over other treatments.. The highest seed cotton yield of 29.90 and 30.14 q/ha was recorded in case of Fipronil 200 SC at 375 ml/ha during kharif 2011 and 2012, respectively followed by Fipronil 200 SC at 300, Imidacloprid 200 SL at 125 ml/ha and Regent 5% SC which yielded 29.10, 28.92; 27.48, 27.60; 26.00 and 26.35 q /ha during kharif 2011 and 2012, respectively.