Efficacy of Selective Insecticides against the Spotted Pod Borer Maruca vitrata Fabricius (Lepidoptera: Crambidae) on Green Gram [Vigna radiata (L.) Wilczek]

Abstract

The present investigation was conducted at the research plot of the Department of Entomology at Central Research Farm (CRF), Sam Higginbottom University of Agriculture Technology and Sciences, Prayagraj, during the Kharif season of 2024. The experiment was laid out in randomized block design (RBD) with three replications and eight treatments, Spinosad 45% SC (T1), Thiamethoxam 25% WG (T2), Azadirachtin 0.03% EC (T3), Chlorantraniliprole 18.5% SC (T4), Beauveria bassiana 1.15% WP (1x108 spore/lit), (T5) Chlorantraniliprole 8.8% + Thiamethoxam17.5% SC (T6), Emamectin Benzoate 5% SG (T7) and untreated Control (T0) were tested to compare the efficacy against Maruca  vitrata  and their influences on yield of Green gram. Each biopesticide was applied twice at 15-day intervals. Observations on the larval population were recorded one day before each treatment, three, seven and fourteen days after I and II spray on green gram. The outcomes showed that, in comparison to the control, the larval population greatly decreased in all of the insecticides and bio pesticides Among all the treatments, the plot treated with T6 Chlorantraniliprole 8.8% + Thiamethoxam 17.5% SC (1.06) proved most effective followed by T4 (1.29), T1 (1.73), T2 (2.30), T7 (2.56) and T5 (3.13). Among the treatments applied, the best and most effective treatment was T6 Chlorantraniliprole 8.8% + Thiamethoxam 17.5% SC (1:3.78), followed by T4 (1:3.23), T1 (1:3.20), T2 (1:3.19), T7 (1:2.97), T5 (1:2.95), T3 Azadirachtin 0.03% EC (1:2.75) as compare to control plot T0 (1:1.73)