Bio-efficacy of some new insecticide molecules against pod borer complex of Red gram

Abstract

Field experiment was conducted at District Seed Farm, Bidhan Chandra Krishi Viswavidyalaya, Kalyani, West Bengal during the year 2008–09 and 2009–10 crop growing seasons to evaluate the bio-efficacy of premix formulation of pyridalyl 15% + fenpropathrin 20% EC against pod borer complex of red gram. ‘UPAS-120’ variety of red gram was sown during kharif season in the plot size of 5m x 4m with 70cm (R-R) and 30cm (P-P) spacing. The experiment was laid out in Randomized Block Design (RBD) with three replications for each treatment. Three round spraying of three doses of pyridalyl -15% + fenpropathrin- 20% EC (75+100, 90+120 and 105+140 g a.i./ha) along with single dose of their individual counterparts; pyridalyl 10% EC (100 g a.i./ha) and fenpropathrin 30% EC (100 g a.i./ha) and a combined product chlorpyriphos 50% + cypermethrin 5%EC (500 + 50 g a.i./ha) and a commonly recommended insecticide (as standard check) viz., indoxacarb 14.5 SC (60 g a.i./ha) were done during the cropping season where the first round was given at 10% flowering followed by full blooming and bearing stage at 25 days interval. Results revealed that pyridalyl 15% + fenpropathrin 20% EC @ 105+140 g a.i./ha and 90+120 g a.i./ha were quite effective and were at par with each other in controlling red gram pod borer complex (Helicoverpa armigera Hub., Exelatis atomosa Wals. and Melanagromyza obtusa Mall.) and recorded higher grain yield (1.96 and 1.85 t/ha, respectively) than rest of the treatments.