Pesticide dilution method

Commercial pesticides, except for low-concentration powders or granules, can be sprayed and sprayed directly. Generally, they must be diluted to a certain concentration before they can be used. If the concentration is too small, pests cannot be killed and the purpose of prevention and control cannot be achieved; Being too large will not only cause economic waste, but also cause plant damage, kill, kill natural enemies, or cause poisoning in humans and animals, and accelerate pest resistance and environmental pollution. Therefore, we must learn to properly and reasonably dilute the pesticides so as to not only cause waste but also achieve prevention and control. Therefore, we need to know how to express the concentration of pesticides.
1, commonly used pesticide concentration method:
1 percent concentration (%): The content of active ingredient is expressed in percent. For example, 40% dimethoate EC indicates that 100 parts of this EC contain 40 active ingredients of dimethoate.
The percentage concentration is divided into two types: weight percent concentration and volume percent concentration. Between the solid and the solid or between the solid and the liquid, the weight percent concentration is commonly used when dispensing, and the volumetric concentration is commonly used between the liquids.
2 ppm concentration (ppm): refers to the number of active ingredients in 1 million doses of pharmaceuticals. A 200 ppm "920" solution indicates that one million parts of this solution contained 200 parts of the "920" active ingredient.
3 times the number of methods: the liquid (or powder) in the amount of diluent for the original dosage of the number of times, that is to say how many times the agent diluted method. If 80% dichlorvos 800 times, that means 1 pound 80% dichlorvos EC should add 800 pounds of water. Therefore, the multiple method generally cannot directly reflect the active ingredient of the drug. The greater the dilution, the smaller the concentration of the liquid. Diluted effective concentration (%) = (commercial pesticide effective dilution multiple) 100
2, dilution calculation method: (how to drug)
1 Calculated by the effective component:
Formula: Original drug concentration Original drug weight = diluted drug concentration Diluted drug weight If any of the above formulas are known, you can find any one of them.
2 According to the calculation method of dilution multiple:
Formula: Diluted drug weight = original drug weight Dilution multiple If the two formulas are known, you can find any one of them.

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