Field Efficacy and Economics of Selected Biopesticides and Chemicals against Shoot and Fruit Borer, Earias vittella (Fabricius) on Okra

Abstract

The field trial was conducted at Central Research Field, Department of Entomology, Naini Agricultural Institute, Sam Higginbottom University of Agriculture, Technology and Sciences, Prayagraj during kharif season 2023.The experiment was laid out in in Randomised Block Design (RBD) with eight treatments each replicated thrice using variety Kashi Chaman. The treatments viz., T1 Beauveria bassiana 1.5% T2 Spinosad 45%SC T3 Neem seed kernel extract 10%WP T4 Emamectin Benzoate 5SG T5 Fipronil 5SC T6 Chlorantraniliprole 18.5SC T7 Azadirachtin 0.03%WSP 300PPM (5ml/lit) and along with untreated control T0 against Earias vittella in okra. The data on percentage of shoot and fruit infestation of okra shoot and fruit borer first and second spray mean revealed that all treatments are significantly superior over control. Among all the treatments lowest per cent shoot and fruit, infestation was recorded in T6 Chlorantraniliprole 18.5SC (8.46) (9.44),, T2 Spinosad 45% SC (9.95) (10.44),, T4 Emamectin benzoate 5%SG (11.83) (11.85),, T5 Fipronil 5%SC (12.96) (12.91),, T3 Neem seed kernel extract 10% WP (14.82) (13.27), T1 Beauveria bassiana 1.5% (15.94) (14.62) and T7 Azadirachtin 0.03%WSP 300PPM (5ml/lit) (16.97) (14.79) and is significantly superior over the control (23.78) (23.26). While The highest yield was recorded in T6 Chlorantraniliprole 18.5SC (210.2q/ha),as well as B:C ratio (1:6.54), T2 Spinosad 45%SC (195.7q/ha) (1:6.02),, T4 Emamectin benzoate 5SG (163.4q/ha) (1:5.17), T5 Fipronil 5SC(149.2q/ha) (1:4.69), T3 Neem seed kernel extract10%WP (138.4q/ha) (1:4.42),, T1 Beauveria bassiana 1.5% (131.7q/ha) (1:4.00), T7 Azadirachtin 0.03%WSP 300PPM (5ml/lit) (120.2q/ha) (1:3.71), as compared to T0 control (90.2q/ha) (1:2.96).