Reasonable compounding of pesticides can improve work efficiency, expand the scope of use, treat several pests and diseases, reduce the amount of drugs, reduce costs, improve drug efficiency, reduce toxicity, and reduce the resistance of pests and diseases to drugs. The following four principles must be followed when mixing pesticides in production.
One is that it does 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 mixing, the active ingredient should not be chemically changed, which may affect the decomposition of the active ingredient. Organophosphorus and carbamate pesticides are sensitive to alkaline, and pyrethroid insecticides and dithioamino acid 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. Although some pesticides are relatively stable under alkaline conditions, they can only be used now under conditions where the alkalinity is not strong, and they cannot be placed for too long after compounding.
Second, the physical properties of the drug cannot be destroyed. The combination of the two types of emulsifiable concentrates requires good emulsifying, dispersing, wetting and spreading 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, reduction or phytotoxicity due to physical changes. If the components are crystallized after compounding, delamination, flocculation, precipitation, etc. in the chemical solution cannot be mixed.
Third, the price of pesticides should be reasonable. The mixed use of pesticides pays attention to economic benefits. In addition to saving labor and time, the mixing should generally be lower than the cost of single use. The more expensive new systemic fungicides are mixed with less expensive protectant fungicides, and 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. When mixing pesticides, it should be clear that there is a connection between the scope of use of the pesticides and the scope of use of the various active ingredients contained in them.
Huaxian County Plant Protection Station Chen Yipin
One is that it does 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 mixing, the active ingredient should not be chemically changed, which may affect the decomposition of the active ingredient. Organophosphorus and carbamate pesticides are sensitive to alkaline, and pyrethroid insecticides and dithioamino acid 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. Although some pesticides are relatively stable under alkaline conditions, they can only be used now under conditions where the alkalinity is not strong, and they cannot be placed for too long after compounding.
Second, the physical properties of the drug cannot be destroyed. The combination of the two types of emulsifiable concentrates requires good emulsifying, dispersing, wetting and spreading 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, reduction or phytotoxicity due to physical changes. If the components are crystallized after compounding, delamination, flocculation, precipitation, etc. in the chemical solution cannot be mixed.
Third, the price of pesticides should be reasonable. The mixed use of pesticides pays attention to economic benefits. In addition to saving labor and time, the mixing should generally be lower than the cost of single use. The more expensive new systemic fungicides are mixed with less expensive protectant fungicides, and 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. When mixing pesticides, it should be clear that there is a connection between the scope of use of the pesticides and the scope of use of the various active ingredients contained in them.
Huaxian County Plant Protection Station Chen Yipin
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