Emulsion pesticide identification
Observation method: It is found that there is sedimentation and stratification in the pesticide. The bottle can be placed in hot water and allowed to stand for 1 hour. If the sediment is decomposed, the floc disappears, indicating that the pesticide is effective; otherwise, it can no longer be used. 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, it means that it has not expired and can be used.
Powder pesticide identification
Suspension method: take 50 grams of powder pesticide, put it in a glass bottle, add a little water to make a paste, add a proper amount of water and mix well, place it for 10-20 minutes, the fine pesticide powder is fine, less and the precipitation is slow; Pesticide powders precipitate quickly and often. Combustion 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 means it has failed. This method is usually used to identify 5% of carbendazim powder. 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.
Wettable powder pesticide identification
Take a cup of water and gently spread a little pesticide on the water. After 1 minute, if the pesticide is not dissolved in the water, it has deteriorated. In addition, 1 gram of pesticide is sprinkled into a glass of water and stirred thoroughly. If precipitation occurs quickly and the liquid surface appears translucent, the pesticide has expired and cannot be used.
Observation method: It is found that there is sedimentation and stratification in the pesticide. The bottle can be placed in hot water and allowed to stand for 1 hour. If the sediment is decomposed, the floc disappears, indicating that the pesticide is effective; otherwise, it can no longer be used. 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, it means that it has not expired and can be used.
Powder pesticide identification
Suspension method: take 50 grams of powder pesticide, put it in a glass bottle, add a little water to make a paste, add a proper amount of water and mix well, place it for 10-20 minutes, the fine pesticide powder is fine, less and the precipitation is slow; Pesticide powders precipitate quickly and often. Combustion 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 means it has failed. This method is usually used to identify 5% of carbendazim powder. 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.
Wettable powder pesticide identification
Take a cup of water and gently spread a little pesticide on the water. After 1 minute, if the pesticide is not dissolved in the water, it has deteriorated. In addition, 1 gram of pesticide is sprinkled into a glass of water and stirred thoroughly. If precipitation occurs quickly and the liquid surface appears translucent, the pesticide has expired and cannot be used.
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