First, the identification of powdered pesticides
1 Intuitive method: If the appearance is obviously damp, the powder is clumped, the taste is not strong or there are other mildew acid odor; Or hand pinch moisture is heavy, hard pinch twist into a group, indicating that the drug is basically ineffective.
2 Dissolving method: Take 30g wettable powder pesticide, put it into a glass container, add a small amount of water to make a paste, then add enough 150g water to stir well, and let it stand for observation. The undeteriorated pesticide has good solubility, small amount of suspended powder and slow precipitation rate. On the contrary, if the precipitation is rapid, the powder particles are large and clustered, it indicates that the pesticide has deteriorated and failed.
Second, the identification of emulsion (oil) pesticides
1 Intuitive method: bottled emulsion (oil) pesticide, after standing, if turbidity or oil and water stratification, and precipitation and suspension flocculation, indicating that the agent has failed.
2 Hot melt method: Put the bottled pesticide with precipitation into wet water, warm lh, if the sediment slowly dissolves, indicating that the pesticide has not deteriorated; If the sediment is difficult to dissolve or does not dissolve, it indicates that it has basically failed or completely failed. The medicine bottle with layered pesticide is forcibly oscillated, and the lh is left standing, if it is no longer layered, it can still be used; If more obvious layering occurs, it cannot be used.
3 Dilution method: Take lg cream pesticide, add 100g of water, fully stir the lh, if there is no cream on the surface, no precipitation at the bottom, the diluent is uniform milky white, indicating that the drug has good property, if there is precipitation at the bottom, water and oil stratification, indicating that the drug has failed.
