BIO-EFFICACY OF DIFFERENT NOVEL INSECTICIDES AGAINST COTTON SUCKING PESTS IN COTTON

Abstract

The bio-Efficacy of certain novel insecticides against cotton sucking pests was studied during kharif 2011-12 at Regional Agricultural Research Station, Lam, Guntur. Test hybrid was RCH-2. Among different insecticides tested, imidacloprid 70% WG @ 21g a.i. ha-1 was effective against aphids with a reduction of population upto 69.4% over control at 10 DAT. Fipronil 5% SC @ 50 g a.i. ha-1 and fipronil 80% WG @ 50 g a.i. ha-1 were effective in managing leafhopper with a population reduction of 70.9% and 67.6% respectively. Fipronil 5% SC @ 50g a.i. ha-1 was also found effective in suppressing thrips population to the extent of 76.7% at 10 DAT. Maximum reduction in whitefly population upto 76.3% was recorded in acephate 75% SP @ 750 g a.i.ha-1 treated plot. Seed cotton yield ranged from 13.5 to 7.2 q/ha, highest yield was recorded in fipronil 5% SC @ 50 g a.i. ha-1 (13.5 q/ha) followed by fipronil 80% WG @ 50 g a.i. ha-1 (13.4 q/ha). Lowest yield was recorded in untreated control (7.2 q/ha). Recent results suggests a number of insecticides for a successful management strategy of sucking pest complex in cotton.