BIO-EFFICACY OF RYNAXYPYR 20% SC (CHLORANTRANILIPROLE), A NEW MOLECULE, AGAINST EGGPLANT SHOOT AND FRUIT BORER

Abstract

Field investigations were undertaken for two consecutive crop seasons to study the bio-efficacy of rynaxypyr 20% SC (Chlorantraniliprole), the only representative of a new class of insecticide, anthranilic diamide against eggplant shoot and fruit borer at Bidhan Chandra Krishni Viswavidyalaya, West Bengal, India. Cypermethrin 10% EC at 60 g a.i./ha and cartap hydrochloride 50% SP at 350 g a.i./ha were used as standard checks. Rynaxypyr 20% SC at 20-60 g a.i./ha significantly reduced shoot and fruit infestation by the pest compared with the untreated control and cartap hydrochloride 50% SP at 350 g a.i./ha, and increased the yield significantly. However, 40-60 g a.i./ha dosages of the insecticide showed better performance and gave significantly higher yields than the lower dosages, and to some extent with cypermethrin 10% EC at 60 g a.i./ha. Cartap hydrochloride 50% SP at 350 g a.i./ha showed higher percentages of fruit damage than the control. Considering the bio-efficacy of the insecticide and yield of egg plant, rynaxypyr 20% SC at 40 g a.i./ha is suggested for effective management of egg plant shoot and fruit borer. Rynaxypyr 20% SC at different dosages did not cause any significant reduction in the predatory fauna present on the eggplant ecosystem. This insecticide, even at a dosage of 300 g a.i./ha, did not produce any phytotoxicity to the treated eggplant crop.