稻纵卷叶螟是危害水稻的一种迁飞性害虫,近年来在江苏等省发生和危害重。7～8月份,从南方迁入的稻纵卷叶螟迁入量大、迁入峰次多,常造成田间虫龄大小不一。不同虫龄的稻纵卷叶螟对毒死蜱、杀虫单等常用药剂的抗性有较大差别,低龄虫抗药性差,高龄虫抗药性强。正确识别田间稻纵卷叶螟幼虫的虫龄,有利于合理选药,提高治虫效果,节省防治成本。 Rice leaf roller is a kind of migratory pest that endangers rice, which occurred in Jiangsu and other provinces in recent years. From July to August, the rice leafroller moved in from the south moved in large amount and migrated into the peak times, often resulting in different insect ages in the field. Different larvae of different larvae had greater resistance to chlorpyrifos, insecticide and other commonly used agents. The resistance of young larvae was poor and the resistance of older larvae was stronger. Proper identification of larvae in the field of rice leaf roller borer larvae age, is conducive to the rational selection of drugs, improve the effect of pest control and save the cost of prevention and treatment.