Bioefficacy of insecticides against aphids, whitefly and their predators on okra agroecosystem

Abstract

A field experiment was conducted at Vegetable Research Centre, GBPUA&T, Pantnagarduring kharif 2016 to evaluate the efficacy of six insecticides viz. carbofuran 3% CG @ 1000 g a.i./ha, thiamethoxam 25% WG @ 25 g a.i./ha, chlorantraniliprole 18.5% SC @ 25 g a.i./ha, quinalphos 25% EC @ 200 g a.i./ha, buprofezin 25% SC @ 200 g a.i./ ha, cypermethrin 25% SC @ 50 g a.i./ha against aphids, whitefly and their predators in okra agroecosystem. Among all the treatments buprofezin 25% SC @ 200 g a.i./ha was highly effective against whitefly (77.45% and 74.22% reduction over control) after first and second spray, respectively. Thiamethoxam 25% WG@ 25 g a.i./ha, gave the good results against aphids (75.99% and 76.27% reduction over control) after first and second spray, respectively. This was further followed by chlorantraniliprole 18.5% SC @ 25 g a.i./ha and buprofezin 25% SC @ 200 g a.i./ ha. The plots treated with chlorantraniliprole 18.5% SC @ 25 g a.i./ha recorded the maximum population of spiders and Coccinellaspp. Similarly, chlorantraniliprole 18.5% SC @ 25 g a.i./ha treated plot recorded the maximum yield (10.81 T/ha) followed by thiamethoxam 25%WG @ 25 g a.i./ha (9.63 T/ha).