Dilution Test: Take 100 grams of emulsifiable pesticide and mix it with 300 grams of water in a glass bottle. Shake the bottle vigorously, then let it sit for 30 minutes. If the mixture is not uniform, if there's an oily layer on top, or if sediment appears at the bottom, it indicates that the pesticide has degraded or lost its effectiveness. The more emulsified the liquid becomes, the worse its quality tends to be.
Floating Test: Take 1 gram of wettable powder pesticide and spread it evenly in 200 ml of clear water. If the powder is fully wetted within one minute and sinks to the bottom, it’s a sign that the pesticide is still effective. If it floats or doesn’t dissolve properly, it may have lost its potency.
Shaking Test: When an emulsifiable pesticide separates into oil and water layers, shake the bottle forcefully. After standing for one hour, if the layers reappear, the pesticide is no longer effective. A good-quality product should remain well-mixed even after shaking.
Hot Dissolution Test: Place an emulsifiable pesticide containing sediment into warm water at 50°C. After one hour, if the sediment dissolves slowly, the pesticide is still usable. However, if the sediment does not dissolve or remains undissolved, it means the pesticide has deteriorated.
Suspension Test: Take 50 grams of wettable powder pesticide and place it in a glass container. Add water and stir thoroughly. Let it stand for 10 minutes. If the powder doesn't dissolve well, and the suspension contains coarse particles, it suggests the pesticide may be of poor quality.
These tests are commonly used by farmers and agricultural professionals to assess the quality and effectiveness of pesticides before use. Always follow safety guidelines when handling chemicals. This article was published by the China Pesticide Network, please cite the source if you reference this information.
By performing these simple tests, users can quickly determine whether a pesticide is still viable or needs to be replaced. These methods are practical, cost-effective, and widely accepted in the industry. It's always better to test before applying, as using expired or ineffective pesticides can lead to poor crop results and environmental harm.
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