Field Efficacy of Certain Chemicals and Neem Products against Shoot and Fruit Borer, Earias vittella (Fabricius.) on Okra in Prayagraj, U.P., India

Abstract

A field trial was carried out at the research plot of the Department of Entomology at Central Research Field, Sam Higginbottom University of Agriculture, Technology and Sciences, Prayagraj during autumn season of 2023. Seven treatments were replicated thrice in Randomized Block evaluated against Earias vittella viz. and also assessed their influences on the yield of okra (T1) Fipronil 5%SC @ 1 ml/lit, (T2) Spinosad 45%SC @1 ml/lit, (T3) Azadiractin 1%EC @ 3 ml/lit, (T4) Chlorantraniliprole 18.5%SC @ 0.3 ml/lit, (T5) Imidacloprid 17.8%SL @ 0.4 ml/lit, (T6) Emamectin benzoate 5%SG @ 0.3 ml/lit, (T7) NSKE 5% @50 ml/lit and (T0) Control. Each treatment was sprayed twice at 14 days interval. The observations of shoot and fruit infestation per plant were recorded one day before, 3rd, 7th and 14th day after each spray. The results revealed that all tested insecticides significantly reduced the pest infestation compared to untreated plot. The lowest percent infestation of shoot and fruit borer was observed in Chlorantraniliprole 18.5% SC (8.96%, 9.29%) and Spinosad45%SC (9.74%, 10.42%) followed by Imidacloprid 17.8% SL (10.58%, 11.04%) Emamectin benzoate 5%SG (11.89%, 12.27%), Fipronil 5% SC (12.46%, 13.09%), Azadiractin 1% EC (12.77%, 14.16%), NSKE 5% (13.42%, 14.63%). The mean crop yield ranged between 30 q/ha to 16 0q/ha, the highest was recorded in Chlorantraniliprole 18.5% SC (160 q/ha) followed by  Spinosad  45% SC (154 q/ha).When cost benefit ratio worked out, the best and the most economic treatment was Chlorantraniliprole 18.5% SC (1:5.7) followed by Spinosad 45%SC (1:5.2), Imidacloprid 17.8% SL (1:5.1), Emamectin benzoate 5%SG (1:4.3), Fipronil 5%SC(1:3.9), Azadiractin 1% EC (1:3.0),NSKE 5% (1:2.5) and Untreated (1:1.18).