1. pH is an important factor affecting the effectiveness of each component. Under alkaline conditions, carbamate, pyrethroid vinegar insecticides , thiram and other dithiocarbamate fungicides are prone to hydrolysis or complex chemical changes, thereby destroying the original structure. Under acidic conditions, sodium 2-methyltetrachloride, amitraz and the like are decomposed, thereby reducing the efficacy.
2. Organic sulfur and organophosphorus pesticides cannot be mixed with pesticides containing copper preparations. For example, a dithiocarbamate fungicide is mixed with a copper preparation and loses its activity due to complexation with copper ions.
3. Microbial source insecticides and systemic organophosphorus pesticides cannot be mixed with fungicides.
4, emulsifiable oil and wettable powder mixed, requires no stratification, oil slick, precipitation and so on.
5, should avoid the occurrence of phytotoxicity of the mixture, chemical changes in the composition of the mixture, may cause phytotoxicity, such as stone sulphur mixture mixed with Bordeaux mixture can produce harmful copper sulphide, will also increase the content of soluble copper ions; Oxalamine and the like cannot be mixed with organic phosphorus or carbamate insecticides.
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