Proper mixing of pesticides can enhance the efficacy of the drug. However, improper use of pesticides will reduce the efficacy of pesticides, increase costs, and some may cause phytotoxicity. The pesticides that can not be mixed are introduced as follows: 1. Pesticides that cause chemical damage in crops after mixing can not be used. Bordeaux mixture and stone flow mixture can be applied separately to control a variety of diseases, but they change chemically soon after mixing. Produces dark brown copper sulfide precipitate, which not only destroys the original bactericidal ability of the two agents, but also produces copper sulfide which will further produce copper ions, causing defoliation, fruit drop, burning lesions on leaves and fruits, or shrinkage. Serious phytotoxicity. Therefore, the mixing of these two pesticides will have the opposite effect. Crops sprayed with Bordeaux mixture can only be sprayed with a stone spray agent every 30 days or so. Otherwise, phytotoxicity will occur. Stone mixture and rosin mixture, organic mercury pesticides, soap or heavy metal pesticides cannot be mixed. Second, acid and alkaline pesticides can not be mixed. Commonly used pesticides are generally classified into three categories: acidic, alkaline and neutral. Sodium fluoride lead, lead arsenate, etc. are neutral pesticides. Copper sulfate, sodium fluorosilicate, chalk, and superphosphate are acidic pesticides. Rosin mixture, stone flow agent, Bordeaux mixture, aluminum arsenate, soap, lime, lime nitrogen and other alkaline pesticides. When the acid-base pesticides are mixed together, they will decompose and destroy, reducing the efficacy and even causing phytotoxicity. Most of organophosphorus insecticides such as dimethoate, fenitrothion, malathion, ammonium phosphate and some pesticides, such as micro-organisms kasugamycin, validamycin, blasticidin rice Pigs net and the like, zineb With ammonium, etc., can not be mixed with alkaline pesticides, that is, the application of lime or grass ash to crops, and can not spray the above pesticides. 3. The pesticide that has been destroyed by the emulsion after mixing cannot be used. Calcium-containing pesticides such as calcium arsenate, stone flow agents, calcium methyl arsenate, and the like. Generally, it 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 can occur. Fourth, fungicide pesticides can not be mixed with microbial pesticides. The fungicide has a direct killing effect on microorganisms, and if the mixed microorganism is killed, the microbial pesticide is thus ineffective. 1 When encountering alkaline substances that are easily decomposed to reduce the efficacy or even fail, they cannot be mixed with alkaline pesticides, such as phoxim. Pyrethroid drugs and the like cannot be used in combination with an alkaline agent such as a stone sulfur agent or a Bordeaux mixture. 2 The pesticides that have a destructive effect on the emulsion after mixing cannot be mixed. 3 Organic sulfur and organophosphorus pesticides cannot be mixed with pesticides containing copper preparations. 4 Microbial-derived insecticides and systemic organophosphorus pesticides cannot be mixed with fungicides. Safety interval The safety interval refers to the period from the last application to the period of grazing, harvesting (harvesting), use, and consumption of crops, from the time after spraying to the time when the residue is reduced to the maximum allowable residue. In the orchard, the last spray and harvest must be greater than the safe interval to prevent human and animal poisoning. The safety interval of commonly used pesticides is: 40% dimethoate EC for 7 days; 50% killing pine oil for 15 days; 20% dicofol emulsifiable concentrate for 45 days; 10% permethrin for 3 days; 75% chlorothalonil WP for 20 days; 2.5% of the enemy killed the emulsifiable oil for 5 days; 20% speed killing butyl oil for 14 days; 50% bromo oxime ester emulsifiable concentrate for 21 days; 50% chlorhexidine WP for 7 days; 2.5% times Lepa WP 14 days; 5% cyhalothrin EC for 21 days; 25% diflubenzuron wettable powder for 14 days; 5% of Fuling EC for 14 days; 20% anti-sweeping cream for 30 days; 73% Kloster cream for 30 days. More pesticide knowledge , please pay attention to China Pesticide Network Shijiazhuang Yihe-Chem Co.,Lrd is a professional enterprise which engages in professional research,development and produce seeds processing machines,grain cleaning machines and agricultual byproducts processing machines. 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