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直观法。对粉剂农药,先看药剂外表,如果明显受潮结块,药味不浓或有其他异味并能用手搓成团,说明其已经基本失效;对乳剂农药,先将药瓶静置,如果药液混浊不清或出现分层(即油水分离),有沉淀物生成或絮状,说明药剂可能已经失效。 加热法。适用于粉剂农药:取农药5～10克,放在金属片上加热,如果产生大量白烟,并有浓烈的刺鼻气
Intuitive method. On the powder pesticides, look at the appearance of the agent, if the obvious damp agglomeration, the drug is not concentrated or have other peculiar smell and can rub into a group by hand, indicating that it has basically failed; the emulsion pesticides, the first bottle placed, if the liquid Turbidity or stratification (ie, oil-water separation), the formation of sediment or flocculent, indicating that the agent may have failed. Heating method. For pesticides powder: Take pesticides 5 to 10 grams, placed on the metal sheet heating, if there is a lot of white smoke, and a strong pungent