Efficacy of some botanical pesticides against mustard aphid Lipaphis erysimi (Kalt.) in Brassica napus

Field experiment on canola type variety of gobhi sarson, GSC 7 was conducted on 20 locations in district SAS Nagar during rabi 2021 and 2022 to evaluate botanical pesticides against mustard aphis Lipaphis erysimi (Kalt.). Seven treatments viz., mixing of non-recommended insecticides (Farmer’s practice), spray thiamethoxam 25WG @ 100 g/ ha, spray homemade neem extract @ 2.5 l, 3.75 l and 5 l/ ha, spray azadirachtin 0.15 EC (1500 ppm) @ 1.25 l/ ha and untreated control were included and evaluated at farmer’s field. Highest crop yield (20.14 q/ ha) was obtained with thiamethoxam followed by azadirachtin spray (19.64 q/ ha) which was on par with homemade neem extract treatment @ 5 l/ ha. Similarly, B:C ratio was found maximum (3.45) in thiamethoxam treatment. The efficacy of all treatments was found maximum on third day after spray which later decreased with time.