ABSTRACT Acephate 75 SP @ 350 g a.i./ha was most effective to pest control as this resulted in more reduction in population of mustard aphid. Higher seed yield was obtained from Fipronil 5 SC @ 50 g a.i./ha (15.56 q/ha) and higher return based on C:B ratio (1:6.8) with Thiamethoxam 25 WG @ 25 g a.i./ha. However, imidacloprid 17.8 SL @ 20 g a.i./ha and clothianidine 50 WDP @ 15 g a.i./ha were moderately effective. Keywords: Efficacy, aphid, chemical, Brassica crop REFERENCES Anonymous (1987). Annual Progress Report, Rapeseed-Mustard, 1986-87. All India Co-ordinated Research Project on Oilseeds, Directorate of Oilseeds Research, Rajendra Nagar, Hyderabad, India. Anonymous (2013). Economic Survey of India, Economic Division. Ministry of Finance, Govt. of India, New Delhi. Bakhetia, D.R.C and Sekhon, B.S. (1989). Insect-pests and their management in rapeseed-mustard. J. Oilseeds Res., 6: 269-299. Das, P.C. (1997). Oilseed Crops of India. Kalyani Publishers, New Delhi, 273 p. Parmar, G.M. and Kapadia, M.N. (2007). Field efficacy of mycoinsecticides and chemical insecticides against mustard aphid in mustard. Indian J. of Plant Protection. 32(2): 339-341. Rai, B.K. (1976). Pests of oilseed crops in India and their control. I.C.A.R., New Delhi, pp. 131. Rana, S.C.; Singh, R.K.; Babu, P.B. and K.S. (2008). Evalution of some newer insecticides against mustard aphid on seed crop of raddish. Seed Research. 36(1):112-114. Rohilla, H. R.; Singh, H. and Kumar, P. R. (1990). Preliminary screening of national varieties of Brassica juncea (L.) (Czern and Coss.) against mustard aphid, Lipaphis erysimi (Kalt.). J. Oilseeds res., 7 (2) : 81-83. Singh, C. (1999). Rapeseed and Mustard. In : Modern Techniques of Raising Field Crops. Oxford & IBH Publishing Co. Pvt. Ltd. New Delhi, 301-313 p. Singh, R.K. and Verma, R.A. (2008). Relative efficacy of certain inscticides against mustard aphid on Indian mustard. J. agric. Sci., 78(9): 821-823.