First, science purchase First, you should go to a regular pesticide store to buy pesticides and not buy pesticides that are sold by mobile vendors. Before buying pesticides, consult agricultural technology extension workers or pesticide sales personnel according to the use of pesticides, applicable crops, and objects to be controlled. When purchasing pesticides, carefully read the labels or instructions for pesticides, carefully inspect the pesticide package, and select the appropriate pesticide. Secondly, the price of the same weight of pesticide in the store may be different due to the difference in the content of active ingredients, dosage forms, and packaging materials of the pesticide. When purchasing pesticides, you should not only look at the price of pesticides in each bag. Instead, consider the amount of pesticide applied per acre, the number of uses, and the method of application. Under normal circumstances, pesticides produced by enterprises with good long-term use and high integrity should be selected. Pesticides with significant differences in prices from similar products should not be purchased. If the price is significantly lower than the previous price of similar products, the possibility of counterfeiting or inferiority is more likely. Again, when buying pesticides, you should ask for a "credit card" and an invoice. If the pesticide is found to be counterfeit when it is used or used, it shall properly protect the pesticide application site, relevant materials and invoices for the purchase of pesticides, as well as the remaining pesticides or packaging materials, and report to the local pesticide supervisory and administrative department or the industry and commerce and technology supervision authorities in a timely manner. For timely investigation. Second, simple identification of pesticide quality Pesticide products can be divided into powders, wettable powders, emulsifiable concentrates, suspensions, suspoemulsions, fumigants, etc., according to the type of dosage form. By looking at the appearance of pesticide products, it can be initially determined whether there is a problem with the quality of pesticide products, and at the same time, it can identify whether the pesticide has failed. 1. Powder and wettable powder pesticide identification. Such agents should be loose powder, no bolus, and uniform color. The following two methods can be applied in recognition: Intuitive method: If the appearance is obviously damp, the powder into a solid block, the smell is not strong or have other mycophenolic acid odor, or the moisture is heavy by hand, pinch licking into a group, indicating that the drug basically fails. Dissolution method: take 30 grams of wettable powder pesticide, put it into a glass container, add a small amount of water to make a paste, then add 150 grams of clear water and stir evenly, and stand and observe. The non-degraded pesticides have good dissolution properties, a small amount of suspended particles, and a slow sedimentation rate. On the contrary, if the sedimentation is rapid, the particles are large and clustered, indicating that the pesticide has been degraded. 2. Identification of emulsion (oil agent) and water pesticide. Such agents should be homogeneous liquids, with no precipitates or suspended solids, and no visible foreign matter. The identification method is as follows: Intuitive method: bottled emulsion (oil agent) pesticides, after standing, if the turbidity is not clear or oil and moisture layer, and precipitation and suspension flocculation. The bottle with layered pesticides was shaken vigorously and allowed to stand for 1 hour. If it was no longer layered, it could still be used. If more obvious stratification occurs, it cannot be used. After adding water, the emulsion liquid is not uniform, or there are slicks, sediments, etc., indicating that the pharmaceutical agent has failed. Hot-melting method: Put the bottled pesticides in the bottle into wet water. After warming for 1 hour, if the precipitate dissolves slowly, the pesticide is not degenerate; if the precipitate is difficult to dissolve or insolubilize, it is basically invalid or Completely failed. Dilution method: take 1 gram of EC pesticide, add 100 grams of water, and stir it for 1 hour. If there is no emulsion on the surface, there will be no precipitate at the bottom, and the diluent will be even milky white, indicating that the drug is good; if there is sedimentation at the bottom, water and oil are separated. , indicating that the drug has failed. 3. Suspending agents, suspoemulsions: These agents should be flowable suspensions without agglomeration. For long-term storage, there may be a small amount of stratification, but after shaking it should be able to restore the original state. If you do not return to the original state after shaking or there are still clumps, there is a problem with the quality of the product. 4. Fumigant: Tablets for fumigation are powdered and indicate failure. 5. Granules: The product should be uniform in thickness and should not contain many powders. Tetrandrine Herb,Tetrandra Extract Powder,Cas 518-34-3,Tetrandrine 98% Shaanxi The River Pharmaceutical Co., Ltd. , https://www.dahepharma.com