Insecticides and natural enemies are the two main means to control insect pests at present. A problem is coming that after spraying of insecticides in the field, some natural enemies were inevitably influenced at lethal or sublethal degree. In order to seek better techniques for coordinating the chemical and biological control measures, and improve the level of integrated pest management, effects of sublethal doses of four insecticides, i.e., imidacloprid, rotenone, fenvalerate and abamectin, on the functio...