Comparative bioefficacy of selected chemical insecticides and biorationals against shoot and fruit borer, (Earias vittella Fabricius) on okra [Abelmoschus esculentus (L.) Moench]

Abstract

The field trial was conducted at the Central field, Department of entomology SHUATS, Allahabad during Kharif from August to November 2016 investigation entitled “Comparative bioefficacy of selected chemical insecticides and Biorationals against shoot and fruit borer, [Earias vittella (Fabricius)] of okra. Seven treatments were evaluated against Earias vittella i.e., T1 Spinosad 45% SC@ 0.05%, T2 Imidacloprid 17.8% SL@ 0.3 ml/l, T4 Neemoil@3%, T3 Verticilium lecanii, T5 Beauveria bassiana, T6 NSKE 5%, T7 Neem leaf extract 5% were evaluated against shoot and fruit borer, Earias vittella. The best and most economical treatment was T1 spinosad 45 SC (1:5.92), followed by T2 (1:4.87), T3 (1:4.40), T4 (1:4.65), T5 (1:4.28), T6 (1:3.84), T7 (1:3.15), as compared to control T0 (1:2.31). Spinosad 45SC, Imidacloprid 17.8 % SL, Beauveria bassiana, and Neem oil recorded the minimum shoot infestation by 5.01, 9.89, 11.40 and 11.85 percent respectively. In fruit infestation Spinosad 45 % SC, Imidacloprid 17.8 % SL, Beauveria bassiana, and neem oil recorded by 7.03, 9.00, 11.77 and 12.99 percent, respectively. The highest yield was noticed in Spinosad 45SC (197.22 q/ha) and Imidacloprid 17.8% SL (156.25 q/ha).