The three points of pesticide mixing must pay attention to
After the pesticides are mixed, the pesticides that cause chemical damage in the crops cannot be applied separately with Bordeaux mixture and stone sulphur mixture. They can prevent and control a variety of diseases, but they will chemically change quickly after mixing, resulting in dark brown copper sulfide precipitation. This not only destroys the original bactericidal ability of the two agents, but also produces copper ions which will further produce copper ions, causing defoliation, fruit drop, burning lesions in leaves and fruits, or severe phytotoxicity such as shrinkage.
Acid-alkaline pesticides cannot be mixed with commonly used pesticides and are generally classified into acidic, alkaline and neutral. Fluoride, sodium arsenate, etc. are neutral pesticides. Copper sulfate, sodium fluorosilicate, chalk, and superphosphate are acidic pesticides. The rosin mixture, the stone sulphur mixture, the Bordeaux mixture, the aluminum arsenate, the soap, the lime, the lime nitrogen and the like are alkaline. When the acid-base pesticides are mixed together, they will decompose and destroy, reduce the efficacy, and even cause phytotoxicity. Most organophosphate insecticides such as dimethoate, chlorpyrifos, malathion, ammonium phosphate, etc. and some microbial pesticides such as chunremycin, jinggangmycin, scutellarin, etc., as well as pig rice net, mancozeb With ammonium, etc., can not be mixed with alkaline pesticides. The above pesticides should not be sprayed after the crops are applied with lime or grass ash.
Pesticides in which the emulsion is destroyed after mixing cannot use calcium-containing pesticides such as calcium arsenate, stone sulfur, calcium methyl arsenate, etc., generally cannot be mixed with emulsion pesticides, and soap cannot be added. Because emulsifiable concentrates and soaps are easily chemically reacted with calcium-containing agents, calcium soap precipitates. The emulsion is destroyed, the efficacy is reduced, and phytotoxicity occurs.
More pesticide knowledge , please pay attention to China Pesticide Network
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