Abstract
Some recently developed and previously cultivated genotypes of canola, Brassica napus L. (BRN 07001, BRN 07002 and Shiralee) and Raya, Brassica juncea (L.) (BRJ 07051, RL 18 and KHN Raya) were evaluated for comparative resistance against cabbage aphid, Brevicoryne brassicae L and mustard aphid, Lipaphis erysimi (Kalt.) at Multan during crop year 2007-08. A completely randomized block design field trial was conducted by assessing aphid densities on each of the six genotypes over six week period. Densities of B. brassicae and L. erysimi were not different on all the sampling dates across the tested genotypes.