Copper preparation pesticides have good control effects on common fungal and bacterial diseases, and are widely used in facility production. However, the variety of copper preparations on the market is complicated and the application is quite different. Many farmers do not know whether the mixed use and continuous use will cause certain phytotoxicity or even aggravate the mites. Not only can the effect of protecting crops be counterproductive, but how to use copper preparation products scientifically?
Variety of applications vary
Most avoiding flowering
Copper hydroxide: It is a protective broad-spectrum fungicide . The original drug is blue powder. The trade name can kill 101, coronal copper, crown bacterium, murder, sterilization, Ruipu, eubacteria, etc. The dosage form is 77% wettable powder.
It is suitable for fungal and bacterial diseases of vegetables, fruits and other crops. After preparation, the drug solution is stable and has good diffusion performance. Spraying on the plant is strong and resistant to rain, it can stably and slowly release copper ions. Generally, it is not easy to produce phytotoxicity to crops, and the bacteria are not easy to produce drug resistance. It can treat fungi and bacterial diseases simultaneously and is safe for humans and animals. .
As a protective fungicide, copper hydroxide should not be mixed with strong acid, strong alkaline pesticides and fertilizers. For example, when mixing other pesticides, a second dilution should be used. It is banned in the flowering and young fruit seasons of sensitive crops such as apples and pear trees.
(Example: Tomato early blight is used before or during the onset of the disease. It can be sprayed at a concentration of 500-700 times, sprayed once every 7 days for 2-3 times, and treats late blight, scab, gray mold, etc. .
When controlling cucumber blight, anthracnose, bacterial angular spot, pepper anthracnose, and scab, spray with 500-700 times, spray once every 6-7 days, and continuously for 3-4 times. )
Cuprous oxide: It is a broad-spectrum inorganic copper fungicide based on protection. It has good adhesion. The trade name includes copper master and god copper. After the protective film is formed, it is resistant to rain. Flowering or young fruit period is prohibited.
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.
DT fungicide: also known as succinic acid copper acid, copper dibasic acid, is a mixture of copper succinate, copper glutarate and copper adipate, is an organic copper fungicide.
Ruixu Copper: also known as nail cream copper, is a compounding agent of 10% metalaxyl and 40% copper dihydroxylate (DT), which has the functions of systemic sterilization and external protection. In the early stage of the disease, the anthrax can be sprayed with 50% sulphur copper 500-600 times, once every 10 days, and even sprayed 2-3 times.
Double-effect spirit: It is a mixed amino acid copper complex fungicide with 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.
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.
Spring Thunder Oxygen Chloride Copper: Also known as Garrinone, fungal diseases such as leaf spot, anthracnose, powdery mildew, early blight and downy mildew of various crops, as well as angular leaf spot, soft rot and ulcer caused by bacteria Diseases have better control effects.
Vegetables and fruit trees are afraid of using the wrong
These conditions cannot be mixed
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, copper preparations Bordeaux liquid phytotoxicity occurs relatively complicated, in addition to crops sensitive or high temperature during the application time, in some fruit trees, such as apple trees, will cause apple rust 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 sulfur 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. This is done because of its dark brownish red color, which can affect 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, but it is easy to produce phytotoxicity when mixed.
Mixed use
Try it before you try it.
1. Wang Tong: Also known as copper oxychloride and basic copper chloride, in addition to the bactericidal and antifungal properties of common copper preparations, Wang copper 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.
2, high copper: a product of basic copper sulphate, some people call it ternary copper, due to structural and technological reasons, can be mixed with a variety of pesticide varieties, in addition to the general variety, with mancozeb containing Cream urea, manganese and zinc mixed, can also be mixed with carbendazim and thiophanate.
3, amber gum 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 nail cream is nail cream copper It can also be mixed with downy mildew to prevent oomycetes.
4. Quinca copper: It is not easy to produce 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.
The mixing of pesticides should follow the principle of trial and use. Due to the differences in auxiliaries and dosage forms of different manufacturers, and the differences in crops, sometimes the two drugs of the same composition can be mixed in some cases, and in other cases, they are phytotoxic, so when they are actually used. Also follow the instructions of the technicians and conduct demonstrations to avoid possible losses.
(Source: Century Pesticide Network )
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