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How to identify true and false pesticides and treat failed pesticides
There are numerous pesticide vendors in today's society, and many experienced farmers are concerned about purchasing pesticides, fearing they might end up with counterfeit products. Learning how to distinguish genuine from fake pesticides is essential for safe and effective use. When buying pesticides, start by checking the product name, specifications, form, toxicity level, function, and application methods. Next, verify the batch number, expiration date, and manufacturer’s name. Generally, organophosphate insecticides have a shelf life of two years, while water-based formulations last about one year. Carbamate and powder types can remain effective for over three years.
For emulsifiable concentrates, the liquid should be uniform and transparent. Shake the bottle and let it sit for an hour—there should be no separation. To test the quality, place the bottle in warm water. If the pesticide is still in good condition, any sediment inside should gradually dissolve. Another method is to mix a few drops of the pesticide into water. If it turns milky white without forming clumps when stirred slightly, it indicates a stable emulsion, meaning the product is likely qualified.
For wettable powders, check for moisture or clumping. If the powder feels damp or sticks together, it may already be degraded. If it forms a soft mass, it’s definitely ineffective. Take a small amount of the powder, mix it with water to make a thin paste, then add more water and stir thoroughly. Let it settle. A high-quality pesticide will have slow settling and minimal sediment. If the powder settles quickly, it has likely deteriorated.
According to the pesticide network, expired or degraded pesticides not only fail to control pests and diseases but can also harm crops through phytotoxicity. In some cases, their effectiveness may decrease or even increase in toxicity. Therefore, it is crucial to handle such products properly. First, they should be buried deeply away from water sources. Second, they should be returned to the seller or the original sales point for safe disposal. Always prioritize safety and environmental protection when dealing with old or questionable pesticides.
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