1. Heating method: It is found that there are sedimentation and stratification and flocculation in the pesticide. The medicine bottle can be placed in hot water and allowed to stand for 1 hour. If the sediment is decomposed, the flocculent disappears, indicating that the pesticide is effective; otherwise, it can no longer be used.
2. Shaking method: stratification occurs in the pesticide bottle, the lower layer of the upper layer of oil slicks, and the medicine bottle can be shaken to make the pesticide uniform. After standing for 1 hour, if it is still layered, it proves that the pesticide has deteriorated. If the layering disappears, you can continue to use it.
Second, the powder pesticide identification method:
1. Suspension method: Take 50 grams of powder pesticide, put it in a glass bottle, add appropriate amount of water and stir evenly, and place it for 10-20 minutes. The good pesticide powder is fine, less and the precipitation is slow; the pesticide powder is precipitated quickly and often.
2. Cauterization method: Take 10-20 grams of powder pesticide, put it on a metal piece and put it on fire. If it is white smoke, it proves that the pesticide has not failed, otherwise it has failed (the 5% carbendazim powder is usually used).
3. Observation method: If the powder pesticide has been agglomerated, it is not easy to be broken, and it proves to be invalid and can no longer be used.
Third, wettable powder pesticide identification method:
Take a cup of water and gently spread a small amount of pesticide on the water. After 1 minute, if the pesticide cannot be dissolved in the water, it has deteriorated. In addition, 1 g of pesticide is sprinkled into a glass of water and stirred thoroughly. If precipitation occurs quickly, the liquid surface is translucent, indicating that the pesticide has failed and cannot be used.
Huaxian Liu Huimin
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