Field studies were conducted in Uttar Pradesh, India, during the 2007/08 and 2008/09 rabi seasons, to determine the effect of intercropping on the mustard aphid ( Lipaphis erysimi) incidence. Indian mustard was intercropped with wheat, barley, pea, chickpea, lentil, linseed and radish, with a sole crop of Indian mustard as the control. The aphid population was determined and yield was recorded at harvest. Results showed that mustard intercropped with barley registered minimum mean aphid population index (2.35) and maximum mean yield of mustard (2.67 q/ha), followed by mustard + wheat, having mean aphid index of 2.53 q/ha and 2.67 q/ha, respectively. Mustard intercropped with linseed and chickpea were also better than the control in checking the incidence of mustard aphid, having 2.88 and 3.09 mean aphid indexes, respectively. However, the mustard intercropped with pea, lentil and radish were at par with the control.
