When pesticides are mixed, attention should be paid to the acidity and alkalinity of pesticides. The acidity and alkalinity of pesticides are differentiated according to the pH (pH value). When using, the label should be noted. From the commonly used pesticides, the alkaline pesticides are mainly Bordeaux and Stone sulphur mixture, especially the basicity of stone sulphur mixture is strong. Among the chlorinated pesticides, most of them are alkaline sensitive, such as organic phosphates, carbamates, pyrethroids, etc. Such pesticides are easily decomposed by alkalis, such as malathion, dichlorvos, dimethoate, omethoate, methyl parathion, carbaryl, etc., which cannot be mixed with alkaline pesticides. Any pesticide that can be mixed with a stone sulphur mixture can generally be mixed with Bordeaux mixture.
According to the China Pesticide Network , currently, as an acidic pesticide, there are mainly low-purity or long-term storage of the enemy hundred strong insects, monocrotophos, and phosphorus amine water. Many of the organic sulfur fungicides are acid-sensitive agents, such as carbendazim, rust-free spirit, etc., and many kinds of fungicides of Fumei system are unstable to acid reaction, and the zinc and Bordeaux liquids are easily decomposed by acid.
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