First, cauterization method This method is used to identify powder pesticides. Take appropriate amount of powder pesticide on the metal object and burn it on the fire. If white smoke is used, the pesticide does not fail.
Second, the shock method This method is used to identify emulsion pesticides. According to the characteristics of easy stratification of emulsion pesticides, first look at whether it is stratified. If it is not stratified, it means that the pesticide is effective; if it is stratified, it can be oscillated up and down several times to make it uniform, then let it stand for 40 to 60 minutes, then carefully Observe that if stratified again, the pesticide is invalid and cannot be used.
3. Dissolution method This method is used to identify precipitated emulsion pesticides. Soak the vial in water at 40 ° C ~ 60 ° C for about 60 minutes. If the sediment at the bottom of the bottle dissolves, the pesticide has not failed. If the precipitate does not dissolve, the precipitate can be filtered out, and a small amount is added and an appropriate amount of warm water is added. If the precipitate is dissolved, the pesticide can still be used.
Fourth, the water method This method is used to identify powders, wettable powders and emulsion pesticides. If it is a powder, take 50 grams of the medicine into the glass and add appropriate amount of water, stir it to dissolve, and let it stand for about 30 minutes. If the particles are suspended evenly and there is no sediment at the bottom of the bottle, the pesticide has not failed. The wettable powder is easy to agglomerate during storage, and the agglomerate can be first ground into a powder, and a small amount of water is added. If dissolved quickly, the pesticide is effective, otherwise it cannot be used. If it is an emulsion, put a small amount into a glass, add an appropriate amount of water to stir, and let stand for 30 minutes. If there is no oil on the surface of the water, there is no sediment at the bottom of the cup, indicating that the pesticide is effective.
Source: Henan Science and Technology News
Second, the shock method This method is used to identify emulsion pesticides. According to the characteristics of easy stratification of emulsion pesticides, first look at whether it is stratified. If it is not stratified, it means that the pesticide is effective; if it is stratified, it can be oscillated up and down several times to make it uniform, then let it stand for 40 to 60 minutes, then carefully Observe that if stratified again, the pesticide is invalid and cannot be used.
3. Dissolution method This method is used to identify precipitated emulsion pesticides. Soak the vial in water at 40 ° C ~ 60 ° C for about 60 minutes. If the sediment at the bottom of the bottle dissolves, the pesticide has not failed. If the precipitate does not dissolve, the precipitate can be filtered out, and a small amount is added and an appropriate amount of warm water is added. If the precipitate is dissolved, the pesticide can still be used.
Fourth, the water method This method is used to identify powders, wettable powders and emulsion pesticides. If it is a powder, take 50 grams of the medicine into the glass and add appropriate amount of water, stir it to dissolve, and let it stand for about 30 minutes. If the particles are suspended evenly and there is no sediment at the bottom of the bottle, the pesticide has not failed. The wettable powder is easy to agglomerate during storage, and the agglomerate can be first ground into a powder, and a small amount of water is added. If dissolved quickly, the pesticide is effective, otherwise it cannot be used. If it is an emulsion, put a small amount into a glass, add an appropriate amount of water to stir, and let stand for 30 minutes. If there is no oil on the surface of the water, there is no sediment at the bottom of the cup, indicating that the pesticide is effective.
Source: Henan Science and Technology News
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