First, the intuitive method: first look at whether the product has passed the validity period, the effective period of the pesticide is generally from the date of production of the product, the time is 2 years. If the expiration date expires, the pesticide will deteriorate. Products in the validity period depend on changes in appearance characteristics. If the powder pesticide has been obviously agglomerated by moisture, the odor is not strong or there are other odors indicating that it has failed; the emulsion pesticide should be left to observe the bottle first, if the liquid is turbid or stratified or precipitated or flocculated When the phenomenon of matter, etc., it indicates that the possibility of drug failure is great.
2. Oscillation method: For emulsion pesticides with upper and lower stratification, it can be mixed by shaking up and down for 1 hour. If stratification occurs, it indicates that the product has failed.
Third, the cauterization method: take the powder pesticide 5 grams - 10 grams on a piece of metal on the fire to heat, if a large amount of white smoke, and a strong pungent odor, indicating good pharmaceutical.
Fourth, hot solution method: suitable for emulsion pesticides. The precipitated pesticide is placed in hot water at 50 ° C - 100 ° C, and after 1 hour, if the precipitate is difficult to dissolve or dissolve, the drug has failed.
V. Floating method: Suitable for wettable powder pesticides. First take 200 liters of clean water into a transparent glass, then take 1 gram of the medicine and gently spread it on the water surface, then carefully observe the change of the powder: the non-failed pesticide is wet and soluble in water within 1 minute.
2. Oscillation method: For emulsion pesticides with upper and lower stratification, it can be mixed by shaking up and down for 1 hour. If stratification occurs, it indicates that the product has failed.
Third, the cauterization method: take the powder pesticide 5 grams - 10 grams on a piece of metal on the fire to heat, if a large amount of white smoke, and a strong pungent odor, indicating good pharmaceutical.
Fourth, hot solution method: suitable for emulsion pesticides. The precipitated pesticide is placed in hot water at 50 ° C - 100 ° C, and after 1 hour, if the precipitate is difficult to dissolve or dissolve, the drug has failed.
V. Floating method: Suitable for wettable powder pesticides. First take 200 liters of clean water into a transparent glass, then take 1 gram of the medicine and gently spread it on the water surface, then carefully observe the change of the powder: the non-failed pesticide is wet and soluble in water within 1 minute.
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