Reasonable compounding of pesticides can improve work efficiency, expand the scope of use, treat multiple pests, reduce the amount of drugs, reduce costs, improve drug efficiency, reduce toxicity, and reduce the resistance of pests to drugs. However, when mixing pesticides, you must pay attention to the following four points:
First, it should not affect the chemical stability of the active ingredients. The chemical nature and structure of the active ingredients of pesticides is the basis of their biological activity. When mixed, the active ingredient should not be chemically changed. One of the possible consequences of this chemical change is the decomposition of the active ingredient, which should be taken seriously.
Organophosphorus and carbamate pesticides are sensitive to alkali, and pyrethroid insecticides and dithioamino fungicides also decompose under more alkaline conditions. When acidic pesticides are mixed with alkaline pesticides, complex chemical changes occur and the active ingredients are destroyed. Some pesticide varieties are mixed and used under conditions where the alkalinity is not strong, and they cannot be placed for too long after compounding.
Second, the physical properties of the agent cannot be destroyed. The two types of emulsifiable concentrates are required to have good emulsifying, dispersing and moisturizing properties. When the two wettable powders are mixed, it is required to have good suspensibility, wettability and exhibiting properties. . This is not only a condition for exerting efficacy, but also prevents failure, physical reduction or phytotoxicity due to changes in physical properties.
Third, the price of pesticides should be reasonable. In addition to labor saving and time saving, the mixed use should generally be lower than the cost of single use. The same control object, generally high cost and low cost pesticides, as long as there is no resistance, often has obvious economic benefits. The more expensive new systemic fungicides are mixed with the less expensive protective fungicides; the more expensive pyrethroid pesticides are mixed with organophosphorus pesticides, which are less expensive than single use.
The fourth is to pay attention to the scope of use of compounding agents. It is necessary to clarify that there is a relationship between the scope of use of the pesticide after compounding and the scope of use of the single agent of various active ingredients contained therein. Mixed pesticides must have their own characteristics in the scope of use, so that the compounding is effective.
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