Evaluation of Bio-Rational and chemical insecticides against leafhopper, Amrasca biguttula biguttula (Ishida) and whitefly, Bemisia tabaci (Gennadius) on okra

Abstract

The present investigation was conducted during July to December 2016 at the Central Research Field, SHUATS, Naini, Allahabad. Application of seven insecticides viz Azadirachtin 5% EC, Verticillium lecanii, Metarhizium anisopliae, Beauveria bassiana, Imidacloprid 17.8% SL, Fipronil 5% SC, Acetamiprid 20% SP were evaluated against leafhopper, Amrasca biguttula biguttula (Ishida) and whitefly, Bemisia tabaci (Gennadius). The lowest population of leafhopper, whitefly and high B:C ratio was recorded in Imidacloprid 17.8% SL with (1.04, 0.85 and 1:9.54) followed by Acetamiprid 20% SP (1.69, 1.21 and 1:7.70), Fipronil 5% SC (1.89, 1.54 and 1:7.31) and Azadirachtin (2.84, 2.48 and 1:5.81) respectively.