Title: Relative efficacy of certain insecticides against mustard aphid in mustard ecosystem
Abstract: Studies on the efficacy of eight insecticides against mustard aphid, Lipaphis erysimi (Kalt.) on Brassica juncea cv. Varuna as foliar spray were carried out at Norman E. Borlaug Crop Research Center of G.B. Pant University of Agriculture and Technology, Pantnagar (India) during Rabi season of 2018-19. Studies revealed that after third and seventh days of spray, Dimethoate 30 EC, Thiamethoxam 25 WG and Imidacloprid 17.8 SL proved most effective against mustard aphid. The maximum seed yield of 21.69 q/ha was recorded in thiamethoxam, which remained on par with imidacloprid (21.43 q/ha) and dimethoate (20.69 q/ha). The lowest seed yield was obtained from untreated plots (10.44 q/ha).