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秋季蔬菜害虫种类多、密度大,有的农民反映施药后防治效果不理想。其主要原因:一是选择的农药不对口,不区分害虫而乱用药;二是不在防治适合期用药;三是不按防治指标施药或长期施用同一种药剂,使害虫产生了抗药性;四是施用剧毒农药,既杀死了害虫也杀死了天敌;五是单纯依靠药剂防治,不采用综合防治措施。我们防治蔬菜害虫时既要考虑如何克服以上的不足,还要在喷药时注意结合害
Many kinds of vegetable pests in autumn, density, and some farmers reflect the effect of prevention and treatment after application is not satisfactory. The main reason: First, the choice of pesticides do not match, do not distinguish between pests and indiscriminate use of drugs; second is not suitable for the prevention and treatment of drug use; third is not according to control indicators of pesticide application or long-term use of pesticides, resistance; Is the application of highly toxic pesticides, killing both pests also killed natural enemies; Fifth, rely solely on chemical control, do not use comprehensive control measures. When we control vegetable pests we must consider how to overcome the above deficiencies, but also pay attention to the combination of spraying