H.R. CHAUDHARY AND N.N. TRIPATHI

The field efficacy of different doses of chitin inhibitors viz., Iufenuron 5 EC and Diflubenzuron 25 WP was evaluated under field conditions against Chrysodeixis actua, (Walker) infesting soybean. Application of lufenuron 500ml and diflubenzuron 350 g. per hectare proved potential in reducing the larval infestation of test insect (0.81 and 0.75) as compared to control (3.39). Higher seed yield (16.76 and 16.87q) against absolute control (10.72q) per hectare as well as maximum monetary return (Rs. 4604 and 5100) and incremental cost benefit ratio (3.29 and 4.86) were also obtained with lufenuron 500 ml and diflubenzuron 350gm in soybean eco-system.