Six methods for pesticide failure identification
Intuitive method for powder pesticides, first look at the appearance of the drug, if it has been obviously wetted by agglomeration, the drug taste is not strong or has Other odors and can be smashed into a group by hand, indicating that it has basically failed; for the emulsion pesticide, first put the bottle, if The liquid turbidity is turbid or stratified (ie, oil-water separation), and precipitates are formed or floccules are suspended, indicating that the agent may have failed.
The heating method is suitable for powder pesticides. Take 5-10 grams of pesticides and heat them on a metal sheet. If a large amount of white smoke is produced, and there is a strong pungent smell, it means that the medicine is good. Otherwise, the description has expired.
The floatation method is suitable for wettable powder pesticides. First take 200 grams of water, then weigh 1 gram of pesticide, gently and evenly spread on the water surface to observe carefully, wet in 1 minute and can sink into the water is the non-failed pesticide, otherwise it is a failed pesticide.
The hot solution method is suitable for emulsion pesticides. Put the pesticide with precipitate into the warm water (the water temperature should not be too high, preferably 50 ° C - 60 ° C), after 1 hour, if the sediment slowly dissolves, the agent has not expired, the sediment to be precipitated It can be used after dissolution; if the precipitate is difficult to dissolve or dissolve, it means it has failed and can no longer be used.
The dilution 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, it means no failure, otherwise it will be a failed pesticide. The more the upper layer of oil, the worse the drug.
The oscillating method is applicable to emulsion pesticides. For pesticides with oily water layer, shake the bottle first and let it stand for 1 hour. If stratification still occurs, the agent has deteriorated.
The heating method is suitable for powder pesticides. Take 5-10 grams of pesticides and heat them on a metal sheet. If a large amount of white smoke is produced, and there is a strong pungent smell, it means that the medicine is good. Otherwise, the description has expired.
The floatation method is suitable for wettable powder pesticides. First take 200 grams of water, then weigh 1 gram of pesticide, gently and evenly spread on the water surface to observe carefully, wet in 1 minute and can sink into the water is the non-failed pesticide, otherwise it is a failed pesticide.
The hot solution method is suitable for emulsion pesticides. Put the pesticide with precipitate into the warm water (the water temperature should not be too high, preferably 50 ° C - 60 ° C), after 1 hour, if the sediment slowly dissolves, the agent has not expired, the sediment to be precipitated It can be used after dissolution; if the precipitate is difficult to dissolve or dissolve, it means it has failed and can no longer be used.
The dilution 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, it means no failure, otherwise it will be a failed pesticide. The more the upper layer of oil, the worse the drug.
The oscillating method is applicable to emulsion pesticides. For pesticides with oily water layer, shake the bottle first and let it stand for 1 hour. If stratification still occurs, the agent has deteriorated.
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