Bio efficacy of new insecticides against major sucking pests and effect on their natural enemies of BT cotton BG II

Abstract

The experiment was carried out during the kharif season of 2010. In this experiment bio efficacy of new insecticides against major sucking pests and effect on their natural enemies of Bt cotton BG II study was taken. The result revealed that the Imidacloprid 17.8 SL were most effective against management of sucking pests such as aphid, jassids and thrips population. Whereas, fipronil 5 SC and acephate 75 SP were equally reduced the aphids population. Thiamethoxam 25 WG, dimethoate 30 EC and trizophos 40 EC were superior against white flies. Imidacloprid 17.8 SL, acetamiprid 20 SP and thiamethoxam 25 WG not only proved to be effective against jassids but also did not showed its adverse effects on the population of lady bird beetle adult and grubs, Chrysopa larvae and spiders at 10 DAT. Imidacloprid 17.8 SL followed by acephate 95 SG and 75 SP was obtained highest seed cotton yield recorded highest ICBR (1: 14.13), indicating most cost effective treatment.