Evaluation of new molecules against jassids and white flies of Bt cotton

Abstract

An experiment was conducted to evaluate the efficacy of new molecules as well as biopesticides against jassids and whiteflies of Bt cotton. Ten treatments i.e. Buperofezin 25 SC@250ml a.i.ha-1, flonicamid 50 WG (75 & 100g a.i.ha-1), fipronil 5 SC (100 & 87.5ml a.iha-1), diafenthiuron 50 WP @300g a.i. ha-1, NSKE 5%, Verticillium lacanii @ 10g lit.-1, Metarhizium anisopliae @ 10g lit-1 and check were evaluated. Seven days after spray, the maximum per cent reduction in jassids and whitefly population with a mean of 77.80; 79.13 and 81.71; 83.27 was recorded in difenthiuron 50 WP during both the years, respectively and it was statistically at par with flonicamid 50 WP@ 100g a.i. and fipronil 5 EC @ 100g a.i.ha-1. Among biopesicides, NSKE 5% gave comparatively higher per cent reduction in population of jassids and whiteflies in compare to entomopathogenic fungals. The maximum mean seed cotton yield of 3101 kgha-1 with highest net profit of Rs. 51,381 ha-1 was obtained in difenthiuron 50 WP @ 300g a.i ha-1.