Efficacy and Economics of Some Insecticides against Pod Borers in Black gram

Field testing of thiodicarb 75 WP @ 375.00, 468.75 and 562.50 g.a.i./ha, endosulfan 35 EC @ 750 g.a.i./ha, chlorpyriphos 20 EC @ 400 g.a.i./ha and quinalphos 25 EC @ 500 g.a.i./ha, was done for their efficacy against pod borers in black gram. The minimum larval population of 0.83 and 0.58 larvae/5 plants was recorded with endosulfan 35 EC @ 750 g.a.i./ha followed by thiodicarb 75 WP @ 562.50 g.a.i./ha (1.00 and 0.75 larvae/5 plants) at 3 and 7 days after spraying which was on par with it. The lowest pod damage of 5.0% was recorded in thiodicarb 75 WP @ 562.50 g.a.i./ha followed by chlorpyriphos (5.3%) and endosulfan (5.6%). The maximum grain yield of 1114 kg/ha was noticed with the treatment of chlorpyriphos 20 EC @ 400 g.a.i./ha followed by endosulfan 35 EC @ 750 g.a.i./ha (985 kg/ha) and thiodicarb 75 WP @ 562.50 g.a.i./ha (966 kg/ha). However, the highest per Rs. return gained with chlorpyriphos (7.86) followed by endosulfan (4.19) and quinalphos (2.72).