Efficacy of new molecules of insecticides against tea mosquito bugs, Helopeltis spp. on cocoa

Abstract

The results of efficacy of new insecticides clearly indicated that all the insecticides were effective against tea mosquito bug in cocoa. Thirty days after spray (DAS), bifenthrin 10 EC (0.008%) 0.8 ml/l was found to significantly reduced tea mosquito bug infestation followed by imidacloprid 17.8 SL (0.004%) 0.25 ml/l and thiamethoxam 25 WG (0.005%) 0.2 g/l; however, both the treatments were on par with each other. The green labeled insecticide chlorantraniliprole 18.50 SC (0.009%) 0.5 ml/l recorded significantly low efficacy among tested insecticides. The economic analysis indicated that the bifenthrin 10 EC (0.008%) 0.8 ml/l treated plot recorded higher net gain of `147.6/ tree and benefit cost ratio of 1:2.5 followed by imidaclopird 17.8 SL (0.004%) `141.3/ tree net gain and 1:2.5, BC ratio.