一、适时施用。不同地块,同一作物生长状况则各异。因此,要根据虫情测报结合本地实际情况,找准施药时间适时喷施。如水稻螟虫就必须在其盛孵的高峰期用药,效果才最佳。二、交替使用。对同一处虫害,采取不同品种而药效相同的农药交替轮换喷施,这样可克服虫害的抗药性而取得良好的防治效果。例如蚜虫、红蜘蛛就可以用尿洗合剂、敌蚜螨、克虫灵、甲胺磷、辛硫磷等交替使用。三、混合喷治。有时,作物病虫可以同时发生数种,为了达到兼治目的,可以科学 First, timely application. Different plots, the same crop growth are different. Therefore, according to the local situation in line with local conditions, identify application time spraying timely. Rice stem borers, for example, must be administered at the peak of their incubation, and the effect is best. Second, use alternately. Pest on the same place, take different varieties and the same effect of pesticides alternating rotation spraying, which can overcome the resistance of pests and obtain good control effect. For example, aphids, spider mites can be washed with urine, enemies aphids mites, g insecticide, methamidophos, phoxim and other alternate use. Third, mixed spray treatment. Occasionally, several kinds of crop pests can occur simultaneously, in order to achieve the purpose of treating both diseases and can be scientific