EFFICACY OF SOME NOVEL PESTICIDES AGAINST MUSTARD APHID

Abstract

Brassica oilseed crops are the major Rabi oilseed crops grown in India, which are collectively referred to as rapeseed-mustard. Several insect pests attacking the Brassica. Among them mustard aphid, Lipaphis erysimi is the most serious pest causing up to 97.0 per cent yield loss.Therefore six newer insecticides were tested against this insect. the aphid population in thiomethoxam treated plots was minimum (0.24 aphids/10cm apical shoot) which was statistically at par with imidacloprid treatment with 99.33 and
98.50 per cent reduction in population. While minimum reduction (94.84 percent) of aphid population was recorded in fipronil 5SC treatment at days after spraying. The highest cost benefit ratio was observed from imidacloprid 17.8SL@20g ai/ha (1:18.54) followed by thiamethoxam 25WG@25gm a.i./ ha (1:17.62)