The mixed use of pesticides saves labor and time, and the benefits of one spray can prevent and cure a variety of pests and diseases, which is very attractive to vegetable farmers. Because copper preparations have a good effect on bacterial diseases, if the fungicides and oomycetes can be properly mixed, the bacteria, fungal diseases and oomycetes can be controlled at the same time. However, copper preparations are most likely to cause phytotoxicity. Mixed use further increases the possibility of phytotoxicity. Therefore, it is necessary to pay attention to many contraindications in the mixing of copper preparations. In addition to not being used for sensitive crops, these should also be noted: 1. Under normal circumstances, it cannot be mixed with pesticides containing “metalâ€. If it cannot be mixed with drugs such as mancozeb, dexamethasone, thiram and other ingredients, it cannot be mixed with foliar fertilizer containing "metal". Metal ions can cause sedimentation of suspensions and suspensions, which can change the efficacy or cause phytotoxicity. Because the copper ions themselves and the metal ions in various pesticides may also cause this reaction, this makes the copper preparations more complicated in the mixed use, and it is more difficult to predict whether or not the chemicals are harmful. 2. Most copper preparations cannot be mixed with thiophanate-methyl (methyl thiophanate), carbendazim and pesticides containing carbendazim. Therefore, when the situation is unknown, a preliminary test should be done, that is, mixing first to see if there is any change in color, bubble generation, precipitation, or colloidal suspension change, chemical reaction phenomenon such as drug moisture layer, once these phenomena occur Can not be mixed. Or you can test it on the vegetables first, and then use it in large areas when there is no phytotoxicity. The earliest use of copper preparations is Bordeaux mixture, which is prepared from copper sulphate and lime. According to the different proportions of copper sulfate and lime, the Bordeaux mixture can be formulated in three ways: half of the lime (the lime is half of the copper sulfate), the same amount and the multiple. The high copper content increases the possibility of phytotoxicity, and the high lime content reduces the possibility of phytotoxicity. However, some crops are not resistant to lime, so there is also the possibility of being damaged by lime. 3. The occurrence of phytotoxicity of copper preparations Bordeaux mixture is relatively complicated. Except for crops sensitive or high temperature during application, in some fruit trees such as apple trees, apple rust occurs due to spraying in young fruit. Especially the "Golden Shuai" variety. This is most likely to occur within a month after apple blossoms, called the sensitive period of "rust", sometimes when the weather conditions are special, sometimes after heavy rain in the weather. If the wind blows, the apple trees sprayed with Bordeaux liquid will have the leaves of the spring shoots, the browning of the vascular bundles in the petiole or the corresponding browning of the new subcutaneous skin, which is called Bordeaux liquid and wind damage. It is particularly worth mentioning that the “Jonagold†varieties of potatoes, tomatoes, melons, grapes and apples are sensitive to lime. The lime in the Bordeaux mixture can cause deformation and rollover of the leaves, and the symptoms of apples For gold and many grape varieties, the proportion of lime in Bordeaux mixture can be reduced, such as a half-size. 4. When applying Bordeaux mixture, avoid mixing the stone sulphur mixture to prevent the interval from being too short, and do not mix it with the nail, carbendazim or leaf fertilizer. Since sodium α-naphthylacetate is a sodium salt, the sodium salt is very stable and can be mixed therein, and plays a role in preventing disease on the fruit trees while preventing the fruit from falling before harvest. The industrialized Bordeaux mixture is called “must have†and can be used for a variety of crops such as fruit trees and vegetables. It can be sprayed on the foliar surface or rooted to prevent disease. Bordeaux mixture with detoxification will brown the liquid, which is a chemical change. The mixed color of the antibacterial in Bordeaux liquid is because the bacteriostatic agent contains bactericide, thiram, and the copper preparation and thiram will produce a color change reaction, and the solution turns reddish brown. Sometimes these two drugs are applied to vegetables. Although they are not mixed, as long as the interval is short, the brownish red residual powder will also be produced in the leaves and other parts, making the leaves brownish red. In severe cases, it will hinder photosynthesis. It is carried out, and when there is little residue, it does not matter. However, because of its dark brownish red color, this discoloration affects the appearance of vegetables and is therefore rarely used on vegetables. On the contrary, the Bordeaux mixture contains the effluent of thiram, and the ability to control diseases such as apple ring disease has been improved, so it is called "wave retreat", which is widely used in the prevention and treatment of apple diseases. Some copper preparations are produced by factory complexation, which is different from the mixture, such as copper hydroxide. Manganese complexed with mancozeb has good efficacy and a wide range of sterilization. However, it is not acceptable for us to mix and use ourselves. Mixing will cause phytotoxicity. In production, there are often many phytotoxics caused by mixed copper preparations, sensitive crop problems, mixed problems, high temperature, and long-term deficiencies. But it is not unmixable, and there are the following types that can be mixed: Wang Tong: Also known as copper oxychloride and basic copper chloride, in addition to the bactericidal and antifungal properties of common copper preparations, Wang Tong is characterized by its combination with many fungicides and insecticides . For example, it can be sprayed with 30% suspension 600 times solution and 70% thiophanate-methyl (Atropine) 800 times solution to control brown spot, bacterial leaf blight, anthracnose and bacterial keratosis of vegetables. Diseases and other diseases; "Garinong" mixed with Chunleimycin is often used on tomatoes to control bacterial diseases and leaf molds. For the same reason, Garrinone can also be mixed with Jiatuo. High copper: a product of basic copper sulphate, which is called ternary copper. It can be mixed with a variety of pesticides due to structural and technological reasons. In addition to the general varieties, it can be combined with dextran containing mancozeb. Mixed with manganese and zinc, it can also be mixed with carbendazim and thiophanate. Aromatic acid acid copper: also called DT, is a binary copper, can be mixed with a variety of fungicides, such as mixed with ethyl phosphine aluminum, can simultaneously prevent oomycetes and bacterial diseases, mixed with nail cream is nail cream copper, also It can be mixed with downy mildew to prevent oomycetes. Quinca copper: It is not easy to cause phytotoxicity to vegetables, and can be mixed with various fungicides. In addition, even some copper preparations that are most likely to cause phytotoxicity due to mixing, such as copper hydroxide (can be killed, Feng Hu'an, Guan Guan copper), can also be mixed with organic fungicides such as chlorothalonil and chlorpyrifos. It should be reminded that the mixing of pesticides should be cautious, and the principle of trial use should be followed. Sometimes several drugs are mixed together. No one can say that it is OK or not. Some people have different additives used by different manufacturers. Great difference, some manufacturers of the same variety can be mixed, and some can not. Therefore, the same copper preparations may also be mixed, some can not be mixed, the necessity of trial before mixing is particularly important. More pesticide knowledge , please pay attention to China Pesticide Network Pvb Film-High-End,Pvb Interlayer,Polyvinyl Butyral Film,Pvb Interlayer Film HUAKAI FENGSHI TECHNOLOGY (CHONGQING) CO., LTD. , https://www.cqhkpvb.com