How to judge the failure of pesticides , China Pesticide Network teaches you 6 strokes:
Intuitive method. For powder pesticides, first look at the appearance of the drug. If it has been obviously agglomerated by moisture, the taste of the drug 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, the bottle is first allowed to stand. The liquid is turbid or stratified (ie, oil-water separation), precipitate formation or floc suspension, indicating that the agent may have failed.
Heating method. 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.
Floating method. 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.
Dilution method. Suitable for 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.
Oscillation method. Suitable for 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.
Hot melt method. Special tips for pesticide networks apply to emulsion pesticides. Put the pesticide with the precipitate into the warm water (the water temperature should not be too high, preferably 50 ° C - 60 ° C), after 1 hour, if the precipitate slowly dissolves, the agent has not expired, to be precipitated After the substance is dissolved, it can be reused; if the precipitate is difficult to dissolve or dissolve, it means that it has failed and can no longer be used.
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