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在有些果园中,农药用得越来越多,虫害却越来越严重,这是什么原因呢?主要是因用药不当,杀伤了害虫天敌,增强了害虫的抗药性。如应用广谱杀虫剂、反复连续用药、任意加大农药使用浓度等,均会破坏生态平衡,增强害虫抗药性。要提高果园害虫防治效果,应掌握两个原则:
In some orchards, pesticides are used more and more, pests but more and more serious, what is the reason? Mainly due to improper use of drugs, killing natural enemies of pests and enhance the resistance of pests. Such as the application of broad-spectrum insecticide, repeated continuous medication, any increase in the concentration of pesticides, etc., will undermine the ecological balance and enhance pest resistance. To improve the orchard pest control effect, should grasp two principles: