Synergism of organophosphate insecticides by monosultap against the third instar larvae of oriental armyworm Mythimna separata were studied in the laboratory using leaf dipping method.

• 采用浸叶法测定了杀虫单分别与几种有机磷杀虫剂混配对粘虫3龄幼虫的联合毒力。