在购买或使用化学农药时，要对农药质量进行必要的鉴别，如果购买或使用了已经失效的农药，不仅直接造成经济损失，而且很容易发生药害，同时还会因为病虫害得不到及时有效的防治而导致减产。常用的鉴别方法有：1. 直观法。对粉剂农药，先看药剂外表，如果已经明显受潮结块，药 In the purchase or use of chemical pesticides, the quality of pesticides to make the necessary identification, if the purchase or use of pesticides has failed, not only directly cause economic losses, but also prone to injury, but also because of pests and diseases are not timely and effective Prevention and control led to cut production. Common identification methods are: 1. Intuitive method. Pesticide powder, look at the appearance of pharmaceuticals, if it has been damp agglomeration, medicine