农药在贮存、保管过程中，往往会发生包装损坏、标签丢失，或由于保管不当，使农药变质失效、混杂等问题。因此，在施用之前需对农药的质量进行检查。一、粉剂粉剂农药如长时间贮存，会出现吸潮结块现象，质量变劣，但还可以使用。使用前应先放在通风阴凉处（不可日晒）碾碎； Pesticide storage, custody process, there will often be packaging damage, label loss, or due to improper storage, so that deterioration of pesticides failure, mixed and so on. Therefore, the quality of pesticides needs to be checked before application. First, the powder powder pesticides such as long-term storage, there will be moisture absorption caking, quality deterioration, but can also be used. Before use should be placed in a cool place (not sun) crushed;