Mixed use of pesticides is not allowed

In the spring season, the use of pesticides is relatively frequent. Many farmers are accustomed to mixing pesticides. However, in the mixing process, most people ignore some details, resulting in pesticides that have no effect and produce phytotoxicity to crops.

Pesticides that are prone to phytotoxicity are not allowed to be mixed with Bordeaux mixture and lime sulfur respectively. They can prevent and cure a variety of diseases, but chemical changes occur soon after they are mixed, resulting in black-brown Cu sulfide precipitation. This not only destroys the original bactericidal capacity of the two agents, but also produces copper sulphate which will further produce copper ions, causing the plants to fall leaves, fruit drop, burning spots on leaves and fruits, or serious injury phenomena such as dry shrinkage.

Acid-alkaline pesticides are not allowed to be mixed with commonly used pesticides generally divided into acidic, alkaline and neutral three categories. Lead fluoride, sodium arsenate, etc. are neutral pesticides. Copper sulfate, sodium fluorosilicate, white peony, and superphosphate are all acidic pesticides. The rosin mixture, lime sulfur, Bordeaux mixture, aluminum arsenate, soap, lime, and lime nitrogen are alkaline. The combination of acid and alkaline pesticides will break down, reduce efficacy, and even cause phytotoxicity. Most organophosphorus insecticides such as dimethoate, kaempferol, malathion, ammonium phosphate, etc., and some microbial pesticides such as kasugamycin, jinggangmycin, quercetin, etc., as well as porcine rice net and mancozeb With ammonium, etc., can not be mixed with alkaline pesticides. After spraying the crops with lime or ash, the pesticides cannot be sprayed.

Pesticides with destroyed emulsions after mixing are not allowed to use calcium-containing pesticides such as calcium arsenate, lime sulfur, and calcium methyl arsenate. Generally, they cannot be mixed with emulsion pesticides, nor can soap be added. Because creams and soaps chemically react with calcium-containing agents, calcium soap precipitates. Emulsions are destroyed, efficacy is reduced, and phytotoxicity occurs.

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