Cleverly identifying pesticides

First, do not plan to be cheap and save trouble. Buying pesticides should be purchased in formal units or directly to the factory. Second, pay attention to the contents of the label. Each pesticide must have a complete “label” on its small package, which should include the following: the name of the pesticide, the number of the third certificate (number of pesticide registration certificate, product standard number, license or permit number), and the amount (grams or milliliters) ), instructions for use, precautions, quality assurance period (the quality assurance period of pesticides under normal conditions is generally two years), active ingredients, dosage forms, pesticides, toxicity signs, scope of use, and manufacturer and mailing address. Without any of the above, consumers should question the quality of their products. Third, look for pesticide names. The correct pesticide name usually consists of three parts: content, active ingredient or dosage form. Such as "50% parathion EC", "30% cyanomethrin" and so on. The so-called "insect kill", "exterminator" and other exaggerated propaganda pesticide product names are not credible. Fourth, carefully observe the appearance. Emulsifiable concentrates should be homogeneous liquids (without delamination), without visible suspensions and sediments. Starch and wettable powders should be loose powders without lumps. Suspending agent should be a flowable suspension, not caking and so on. Specific identification methods are: 1. Intuitive method. For powder pesticides, first look at the appearance of the drug, if it is already damply agglomerated, the smell is not strong or there are other odors, and can be handcuffed into a group, indicating that the basic failure; for emulsion pesticides, the first bottle of medicine, if the drug The turbidity of the liquid or stratification (ie, separation of oil and water) with precipitate formation or floc suspension indicates that the agent may have failed. 2, heating method. Suitable for powder pesticides. Take 5-10 grams of pesticide on the metal sheet to heat, if produce a lot of white smoke, and there is a strong pungent odor, indicating good pharmaceuticals; otherwise it has expired. 3, floating method. Suitable for wettable powders. Take 200 grams of clear water first, take 1 gram of pesticide, and spread it on the water gently and evenly. Observe carefully. If it is wet and soluble in water within 1 minute, it is an un-failed pesticide; otherwise it is a pesticide that has already failed. 4, suspension method. Suitable for wettable powder pesticides. Take pesticides 30-50 grams, placed in a glass container, first add a small amount of water into a paste, then add 150-250 grams of water and shake it, stand for 10 minutes to observe, the pesticide has good solubility, liquid suspension The fine particles are small, the sedimentation speed is slow and the amount of precipitation is small; the pesticide that fails is the opposite. 5, oscillation method. Applicable emulsion pesticides. For the emergence of pesticides in the oil-water layer, shake the vials vigorously and observe them after standing for 1 hour. If delamination still occurs, it indicates that the liquid has been degenerated. 6, hot melt. Suitable for emulsion pesticides. The precipitated pesticide was put in a bottle of warm water at 50-60°C and was observed after 1 hour. If the precipitate slowly dissolves, indicating that the chemical has not failed, if the precipitate is insoluble or difficult to dissolve, it means that it has failed. 7, dilution method. Suitable for emulsion pesticides. Take 50 grams of pesticide, place it in a glass bottle, add 150 grams, and shake it for 30 minutes. If the liquid is homogeneous milky white, and there is no slick oil, there will be no precipitate. This indicates that the medicine is good; otherwise it is a failure pesticide. . Fifth, timely inspection, report. If the effect of use is poor or ineffective, even if it produces phytotoxicity, the drug should be sent to the pesticide testing entity for inspection. If there are quality problems, complaints may be filed with the local business administration or technical supervision department, or the court may be sued.

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