Dilution method: Take 100 grams of emulsion pesticide and add 300 grams of water into a glass bottle. After intensive vibration, after standing for half an hour, if the concentration of the drug solution is not uniform, there is emulsifiable concentrate on the top and a sediment at the bottom, indicating that the drug has failed. The more cream, the worse the drug.
Floating method: Take 1 gram of wettable powder pesticide and spread it evenly on 200 ml of clean water. If it is wet within 1 minute and sink into water, it will be no dead pesticide, otherwise it will be failure pesticide.
Oscillating method: When the emulsion pesticide appears oil-water separation, it can oscillate by force and shake the bottle. After standing for 1 hour, if the separation layer still appears, it means that the drug has failed.
Hot-melting method: The precipitated emulsion pesticide was placed in 50-degree warm water with a bottle. After 1 hour, if the precipitate dissolved slowly, the drug had not failed. If the precipitate is hardly soluble or insoluble, the drug has deteriorated.
Suspension method: Take 50 grams of wettable powder pesticide, put it into a glass container, add water and stir well. After standing for 10 minutes, if the pesticide has poor solubility, the suspended powder particles are coarse, which means that it is a failure pesticide.
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