How to identify ineffective pesticides

Published:

2022-10-31

Dilution method: take 100g of emulsion pesticide, put it into a glass bottle and add 300g of water. Shake vigorously and leave it for half an hour. If the concentration of the liquid medicine is uneven, there is emulsifiable oil on the top and sediment on the bottom, it indicates that the medicine has failed. The more emulsifiable concentrates, the worse the drug properties.

Dilution method: take 100g of emulsion pesticide, put it into a glass bottle and add 300g of water. Shake vigorously and leave it for half an hour. If the concentration of the liquid medicine is uneven, there is emulsifiable oil on the top and sediment on the bottom, it indicates that the medicine has failed. The more emulsifiable concentrates, the worse the drug properties.

Floatation method: take 1g of wettable powder pesticide and evenly sprinkle it on 200ml of clean water. If it is wetted and immersed in water within 1 minute, it is an ineffective pesticide, otherwise it is an ineffective pesticide.

Oscillation method: When the emulsion pesticide is separated from oil and water, shake the bottle with force. If the separation layer still appears after standing for 1 hour, it indicates that the drug has failed.

Thermolysis method: put the emulsion pesticide with sediment into 50 ℃ warm water with bottle. If the sediment dissolves slowly after 1 hour, it indicates that the drug has not been invalidated. If the sediment is difficult to dissolve or insoluble, the drug has deteriorated and become invalid.

Suspension method: take 50g of wettable powder pesticide, put it into a glass container, add water and stir well. After 10 minutes of standing, if the solubility of the pesticide is poor and the suspended powder is coarse, it is an invalid pesticide.

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