Abstract: Malathion 57EC and Diazinon 60EC with different doses (1 ml, 2 ml and 3 ml/L water) were tested to evaluate the effect on mustard aphids and their toxicity on the predators and other beneficial insects of mustard aphid. Malathion was more effective than Diazinon for the control of aphids and it was less toxic for the predators and other beneficial insects. The lower dose of insecticides have less adverse effect on the predators and other beneficial insects than the higher dose.