Copper preparation pesticides have good control effects on common fungal and bacterial diseases, and are widely used in facility production, but if used improperly, they may cause phytotoxicity or increase the damage. The following is a description of the scope of use and precautions for several common copper preparations. First, the common copper preparation varieties and applications: 1. Copper hydroxide: The trade name can kill 101, coronal copper, crown bacterium, murder, bactericidal, rui, bacterium, etc. The original drug is blue powder, which is protective broad spectrum. A bactericide , the dosage form is 77% wettable powder. It is suitable for the main fungi and bacterial diseases of crops such as melon, fruit and vegetables. After preparation, the drug solution is stable and has good diffusion performance. After spraying, it has strong adhesion and is resistant to rain. It can release copper ions stably and slowly. Generally, it is not easy to produce phytotoxicity to crops, and bacteria are not easy to produce drug resistance. At the same time, it can treat fungi and bacterial diseases, and it is safe for humans and animals. Usage: It can control the true and bacterial diseases of various crops such as cucumber, tomato, pepper, cowpea, melon and watermelon. For example, tomato early blight is used before or during the onset of the disease, and the concentration is 500-700 times, and it is sprayed once every 7 days for 2 to 3 times. Can treat both late blight, scab, gray mold and so on. Prevention and control of cucumber blight, anthracnose, bacterial angular leaf spot, pepper anthracnose, scab, etc., can be sprayed with 500-700 times liquid, spray once every 6 to 7 days, for 3 to 4 times. As a protective fungicide, it is required to use the drug before or during the onset of the disease, spray once every 7 to 10 days, and continuously use 2 to 3 times for the disease with a high risk and the peak of the disease should be sprayed once every 5 to 7 days. . Note that it should not be mixed with strong acid, strong alkaline pesticides and fertilizers. For example, when mixing other pesticides, it is advisable to apply a second dilution solution. For sensitive crops such as apples and pear trees, they are prohibited during flowering and young fruit. 2. Cuprous oxide: the trade name is bronze master, god copper. It is a broad-spectrum inorganic copper fungicide based on protection. It has good adhesion and is resistant to rain after forming a protective film. Flowering or young fruit period is prohibited. 3. Green milk copper: 12% copper rosinate emulsifiable concentrate. It has excellent spreading and adhesion, and it can maintain good control effect after spraying with rain. The medicinal solution forms a bactericidal protective film on the surface of the plant, which can effectively kill fungal and bacterial pathogens, and has good control effects on ulcer disease and anthracnose. 4. DT bactericide: also known as succinic acid copper, dibasic acid copper, is a mixture of copper succinate, copper glutarate and copper adipate, is an organic copper bactericide. 5. Ruidu copper: also known as nail cream copper, is a 10% metalaxyl and 40% copper dihydroxylate (DT) compounding agent, with systemic sterilization and external protection. In the early stage of the disease, the anthracnose is sprayed with 50% of the sulphur copper 500-600 times, once every 10 days, and even sprayed 2 to 3 times. 6. Double-effect spirit: It is a mixed amino acid copper complex bactericide, containing about 17 kinds of amino acid copper, which has certain fertilizer effect and nutrition effect, and is often used to control diseases such as anthracnose. 7. Basic copper sulphate suspension: also known as green depot, plastic suspension copper, is made of basic copper sulphate added to the sustained release agent, adhesive and dispersant. Compared with general basic copper sulfate, it is not easy to cause phytotoxicity. Generally, 35% suspension agent 400-500 times solution is sprayed at the beginning of the disease. Can be used interchangeably with systemic therapeutic fungicides. 8. Spring Thunder Oxygen Chloride Copper: Also known as Garrinone, fungal diseases such as leaf spot, anthracnose, powdery mildew, early blight and downy mildew on various crops, as well as angular spot and soft rot caused by bacteria And ulcer disease and other good control effects. Second, the use of copper preparations pesticides precautions Copper preparations have good bactericidal effect, wide spectrum of sterilization and low cost of prevention, but the following aspects should be noted during use: 1. Copper sensitive fruit trees such as peach, plum, and persimmon should be used with caution. For the prevention and treatment of peach and plum gum, 12% copper rosinate 800 times solution was used. 2. The copper preparation is banned during the flowering period, and the cuprous oxide cannot be sprayed during the young fruit period. 3. Use with caution during high temperature periods. It is safer to choose imported coccidia and copper rosinate in the high temperature period in summer. At the same time, the dilution factor should be increased in the high temperature season, preferably 1200 ~ 1500 times. 4. It is best to use it alone. Generally, copper preparations cannot be mixed with other pesticides and micro-fertilizers, and it is best to use them separately. It is particularly emphasized that copper preparations cannot be mixed with foliar fertilizers containing metal ions (such as potassium dihydrogen phosphate, complex amino acids, etc.), otherwise complexes are formed to cause damage to young shoots and peels. However, organic copper can be mixed, but it needs to be used now. 5. In the actual application process should also pay attention to: (1) should be used before the occurrence of bacterial or fungal diseases. (2) Adjust the pH of the pesticide to 6 or higher during use. (3) Spray evenly on the leaves and fruits of the plants. (4) The effect of the drug will decrease with the growth of the plant, and there will be a reduction in the wet season, so it should be reused when appropriate. More pesticide knowledge , please pay attention to China Pesticide Network Hovercraft Fan Blades,Plastic Fan Impeller,Fan Blades For Hovercraft,Axial Fan Blades For Airboat Changzhou Keyleader Fan Technology Co. Ltd. , https://www.keyleaderfan.com