农药贮藏过久或因保管不妥,都会造成失效。使用失效农药,不仅不能及时防治病虫害,反而贻误时机,造成不应有的损失。一、粉剂农药如已明显结块或用手提能成团块,说明已经失效或即将失效。粉剂农药一般含水量都在5％以下,结块原因是由于贮存过久,吸收水分引起氧化,使农药有效成份逐渐分解,以至失效。 Pesticides stored too long or due to improper storage, will result in failure. Failure to use pesticides will not only prevent pests and diseases in a timely manner, but will delay the opportunity and cause undue losses. First, powder pesticides, such as obvious agglomeration or hand can become a clump, indicating that has expired or is about to expire. Powder pesticides generally have a water content of less than 5%, caking is due to storage for too long, absorbing moisture caused by oxidation, pesticide ingredients gradually decomposed, and even failure.