Dissolution method: Applied to precipitated emulsion pesticides. The agent can be soaked in warm water at 35-40°C for one hour. If the sediment at the bottom of the bottle is dissolved, the drug can be used; the sediment at the bottom of the bottle can also be filtered out, and the appropriate amount of water can be added to the bowl, such as precipitation. The substance dissolves, indicating that the drug has not failed; if a small part of the precipitate does not dissolve, it proves that the drug is about to fail, but it can also be used, and the control effect can also be achieved by increasing the proportion of the drug when it is used. Burning method: suitable for powder pesticides. A suitable amount of powdered pesticide can be taken on a metal foil and then burned on a fire. If white smoke is present, it proves that there is no failure; if no white smoke or insolubilization occurs, it proves to be a counterfeit medicine. Watering method: Suitable for wettable powder and emulsion pesticides. It is advisable to take 50 grams of powdered pesticide in a glass bottle, add a certain amount of fresh water, and stir a little. After half an hour, if the particles are evenly suspended, there is no precipitate at the bottom of the bottle, indicating that the drug has not failed. Wettable powders tend to become lumpy during storage. The agglomerated powder is crushed and a small amount of water is added. If it dissolves quickly, it proves that the drug has not failed and is not a fake drug. Concussion method: Suitable for emulsion pesticides. First look at whether the upper and lower stratification, if stratified, can shock up and down, to make it uniform, and then set aside for an hour, if still stratified, it is not a failure is a counterfeit drug, can not be reused.
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