Comparative efficacy of synthetic pyrethroids against mustard aphid, Lipaphis erysimi Kaltenbach, infesting rapeseed

Efficacy of synthetic pyrethroids was determined in the field against Lipaphis erysimi Kaltenbach infesting rapeseed Brassica campestris var. brown sarson (BSH-1) at Palampur (H.P.) for three years (1988–89 to 1991–92). Decamethrin 0.008% sprayed once during the second week of February was found to be most effective followed by cypermethrin 0.01% after 7 days of foliar application. The efficacy was quite comparable with the recommended insecticides, methyl demeton and dimethoate, even 14 days after spraying.