Evaluation of bio-rational products against turnip aphid, Lipaphis erysimi (Kaltenbach) on Indian mustard

Studies were conducted to evaluate some biorational products against Lipaphis erysimi (Kalt.) infesting Indian mustard (Brassica juncea L.). Although, chemical insecticide dimethoate 30 EC @ 1 ml/ litre water was the most effective treatment, the spray of azadirachtin 3000 ppm @ 5 ml/ litre water and azadirachtin followed by spray of Beauveria bassiana were the next best treatments. Maximum seed yield of 1911.1 kg/ha was obtained in dimethoate 30 EC with 39.2% yield increase over control (pooled data of two years). It was followed by azadirachtin 3000 ppm @ 5 ml/ litre water (1762.5 kg/ha, 28.4% increase over control) and azadirachtin followed by B. bassiana @ 2g/ litre water (1673.5 kg/ha, 21.9% increase over control) as compared to 1372.3 kg/ha in control. Thus, it can be concluded from the present study that azadirachtin 5000 ppm @ 5 ml/ litre water and azadirachtin followed by B. bassiana @ 2g/ litre water can be used as non-chemical options for the management of L. erysimi.