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我场几年来桃蚜发生严重,有时用药也易引起药害。同时,桃蚜对多种农药也产生抗药性影响效果。为了安全和效期长,我场二年试
My field peach aphid serious in recent years, sometimes medication is also easy to cause injury. At the same time, Myzus persicae also has a variety of pesticides have resistance effect. For safety and long duration, I test two years