When purchasing or using chemical pesticides, it is necessary to first identify the quality of the pesticide. If the pesticide that has expired is purchased or used, it will not only directly cause economic loss, but also easily cause phytotoxicity. Commonly used authentication methods are:
1. Intuitive method for powder pesticides, first look at the appearance of the drug, if it has been obviously wetted by agglomeration, the taste of the drug is not strong or have other odors, and can be smashed into a group by hand, indicating that it has basically failed; for the emulsion pesticide, the bottle is first If the liquid is turbid or stratified (ie, oil-water separation), there is sediment formation or floc suspension, indicating that the agent may have failed.
2. The heating method is suitable for 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 sputum, it means that the medicine is good. Otherwise, it means that it has failed.
3. The floating method is applicable to wettable powder pesticides. First take 200 grams of water, then weigh 1 gram of pesticide, gently and evenly spread on the water surface, carefully observe: wet and soluble in water within 1 minute is a non-failed pesticide, otherwise it is a failed pesticide.
4. Suspension method is applicable to wettable powder pesticides. Take 30-50 grams of pesticides, put them in a glass container, first add a small amount of water to make a paste, then add 150-200 grams of water and mix well, let stand for 10 minutes to observe, wherein the pesticides that have not failed are well soluble, in the liquid The suspended powder is fine, the sedimentation rate is slow, and the amount of precipitation is small.
5. The oscillation method is applicable to emulsion pesticides. For pesticides with oily water layer, first shake the vial with force and let it stand for 1 hour. If stratification still occurs, the agent has deteriorated.
6. The hot melt method is suitable for emulsion pesticides. Put the pesticide with the precipitate into the warm water (the water temperature should not be too high, preferably 50~60 °C). After 1 hour, if the precipitate dissolves slowly, it means that the agent has not expired, and the precipitate is dissolved. It can be reused afterwards; if the precipitate is difficult to dissolve or dissolve, it means it has failed and cannot be used.
7. 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, and there is no oil on the oil, there is no precipitation under it, indicating that the agent is good; the more oil on the upper layer The worse the medicinal properties.
1. Intuitive method for powder pesticides, first look at the appearance of the drug, if it has been obviously wetted by agglomeration, the taste of the drug is not strong or have other odors, and can be smashed into a group by hand, indicating that it has basically failed; for the emulsion pesticide, the bottle is first If the liquid is turbid or stratified (ie, oil-water separation), there is sediment formation or floc suspension, indicating that the agent may have failed.
2. The heating method is suitable for 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 sputum, it means that the medicine is good. Otherwise, it means that it has failed.
3. The floating method is applicable to wettable powder pesticides. First take 200 grams of water, then weigh 1 gram of pesticide, gently and evenly spread on the water surface, carefully observe: wet and soluble in water within 1 minute is a non-failed pesticide, otherwise it is a failed pesticide.
4. Suspension method is applicable to wettable powder pesticides. Take 30-50 grams of pesticides, put them in a glass container, first add a small amount of water to make a paste, then add 150-200 grams of water and mix well, let stand for 10 minutes to observe, wherein the pesticides that have not failed are well soluble, in the liquid The suspended powder is fine, the sedimentation rate is slow, and the amount of precipitation is small.
5. The oscillation method is applicable to emulsion pesticides. For pesticides with oily water layer, first shake the vial with force and let it stand for 1 hour. If stratification still occurs, the agent has deteriorated.
6. The hot melt method is suitable for emulsion pesticides. Put the pesticide with the precipitate into the warm water (the water temperature should not be too high, preferably 50~60 °C). After 1 hour, if the precipitate dissolves slowly, it means that the agent has not expired, and the precipitate is dissolved. It can be reused afterwards; if the precipitate is difficult to dissolve or dissolve, it means it has failed and cannot be used.
7. 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, and there is no oil on the oil, there is no precipitation under it, indicating that the agent is good; the more oil on the upper layer The worse the medicinal properties.
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