一、注意分清农作物类别要根据不同作物选用不同的农药，这是因为有的农药只适用于一种或几种作物，若用于其它作物可能效果甚微甚至无效，有时还可对敏感作物造成药害。二、注意分清防治对象首先要确定防治对象是病还是虫，是真菌病害还是细菌病害，是螨类还是虫类等，以免错? First, pay attention to distinguish the type of crop According to different crops to choose different pesticides, because some pesticides only apply to one or several crops, if used for other crops may have little or no effect, and sometimes sensitive crops can also be caused Injury. Second, pay attention to distinguish between prevention and control targets First of all, to determine the prevention and control of the object is a disease or a bug, is a fungal disease or bacterial disease, mites or insects, so as to avoid wrong?