Mix of pesticides have many advantages, but it does not mean that all pesticides can be mixed use, not all pesticides need to mix. Mixed use is strictly required. It must be based on the chemical and physical properties of the drug itself, as well as the laws and life history of tobacco pests and diseases, to determine whether it can be mixed or mixed. Whether the various pesticides can be mixed with each other should generally consider the following aspects. (1) To clarify the purpose of mixing pesticides. The mixed use of pesticides should mainly achieve the purpose of increasing efficiency, treating and expanding the scope of prevention and control. If you can't achieve the above purpose, it should not be mixed, otherwise it will cause waste, not get the effect it deserves, and even cause phytotoxicity. (2) Adverse chemical and physical changes should not occur after mixing pesticides. If the agent is not decomposed after mixing, the emulsifiable concentrate is not destroyed, and the suspension does not cause flocculation or a large amount of precipitation. For example, dimethoate, dichlorvos, malathion, chlorpyrifos, carbaryl, chlorpyrifos, insecticides and other pesticides are neutral pesticides, which can be mixed with each other. A large number of pesticides, fungicides and herbicides quickly decompose and fail when exposed to alkaline substances. Any agent that is easily decomposed under alkaline conditions cannot be mixed with alkaline substances. (3) After mixing, the mixed liquid should not cause phytotoxicity to the crops. If there is phytotoxicity, it cannot be mixed with each other. (4) After mixing the medicines, it should improve the efficacy of the mixed liquid, at least not to reduce the efficacy, that is, to increase the efficiency after compounding. (5) After the agents are mixed, the acute toxicity of the mixture is generally not higher than the original toxicity, that is, it cannot be poisoned.
The economic effects or problems caused by the mixed use of pesticides are difficult to infer or judge from the physical and chemical properties of the agents alone. At the same time, the physiological responses of the interactions of the agents to pests and weeds are also complicated. Many effective mixed formulas have been created and summarized by the masses and plant protection technicians over the years. Therefore, for new pesticide varieties, whether they can be mixed with each other, it is best to do indoor tests first, then do a community test, and then determine whether it can be used on a large scale.
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