Comparative Efficacy of Selected Chemicals with Biopesticides against Yellow Stem Borer, Scirpophaga Incertulas (Walker) on Paddy (Oryza sativa L.)

Abstract

The experiment 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 2022. The experiment was laid out in a Randomized Block Design (RBD) with three replications, seven treatments and untreated control were evaluated against, Scirpophaga incertulas i.e., Chlorantraniliprole 0.4% G @ 10kg/ha, Spinosad 45% SC @ 200ml/ha, Acephate 75% SP @ 650gm/ha, Emamectin benzoate 5% SG @ 220gm/ha, Bacillus thuringiensis 2ⅹ108 CFU @ 1000gm/ha, Neem oil 5% @ 5lit/ha, Karanj oil 5% @ 5lit/ha and Control. Among the different chemicals and biopesticides, the lowest per cent dead hearts and white ears was recorded in Chlorantraniliprole 0.4% G (4.24%), followed by Spinosad 45% SC (4.54%) and Acephate 75% SP (4.94%). The next best treatments were found to be Emamectin benzoate 5% SG (5.50%), Bacillus thuringiensis 2ⅹ108 CFU (5.71%), Neem oil 5% (5.99%), Karanj oil 5% (7.0%) and the highest dead heart and white ears % infestation of Scirpophaga incertulas (Walker) was found in control treatment (14.00%). The highest yield and cost benefit ratio was recorded with Chlorantraniliprole 0.4% G (69.33 q/ha) and (1:4.7) followed by Spinosad 45% SC (62.16 q/ha) and (1:3.5), Acephate 75% SP (48.33 q/ha) and (1:3.9), Emamectin benzoate 5% SG (41 q/ha) and (1:3.47), Bacillus thuringiensis 2ⅹ108 CFU (37.66 q/ha) and (1:2.47), Neem oil 5% (29.33 q/ha) and (1:1.87), Karanj oil 5% (22.77 q/ha) and (1:1.8).