如何鉴别失效农药？观察法：对于粉剂或可湿性粉剂农药，如果药粉成团结块，或温度较大可捏成团，表明农药失效，液体农药静置后，如果出现油水分层，或发生絮结与沉淀，这是失效农药。悬浮法：对可湿性粉剂，可取药３０～５０克倒入瓶中，加少许水调成糊状，再加适量水搅... How to identify invalid pesticides? Observation method: For the powder or wettable powder pesticide, if the powder into clumps, or the temperature can be kneaded into groups, indicating pesticide failure, liquid pesticide standing, if the oil-water stratification, or the occurrence of flocculation and precipitation, which Is the failure of pesticides. Suspension method: wettable powder, desirable drug 30 ~ 50 grams into the bottle, add a little water into a paste, plus the amount of water stir ...