1. Direct method: For powder pesticides , first look at its appearance. If it has been obviously agglomerated by moisture, the taste of the medicine is not strong or has other odors, and it can be formed into a group by hand, which means that it has basically failed. For emulsion pesticides, the vial is first allowed to stand. If the liquid is turbid or stratified, that is, the oil and water are separated, there is sediment formation or flocculation, indicating that the agent may have failed.
2. Heating method: This method is applicable to powder pesticides. Take 5-10 grams of pesticides and heat them on a piece of metal. If a large amount of white smoke is produced and there is a strong pungent smell, this means that the medicine is good; otherwise, it means that it has failed.
3. Oscillation method: This method is applicable to emulsion pesticides. For pesticides with oily water layer, first shake the vial with force and observe it after standing for 1 hour. If stratification still occurs, this indicates that the agent has deteriorated.
4. Dilution method: This method is applicable to emulsion pesticides. Take 50 grams of pesticide, put it in a glass bottle, add 150 grams of water, shake it vigorously and let it stand for 30 minutes. If the liquid is evenly milky white, and there is no oil on the oil, there is no sediment, which means the agent is good; otherwise it is Insufficient pesticides, and the more the upper layer of oil, the worse the drug.
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