As one of the important fungicides, copper bactericide has the earliest development and application time, the longest use time, the largest application area, the best bactericidal effect and the most widely used.
Copper bactericide can not only prevent fungal diseases, but also prevent and cure bacterial diseases; it has both protective and preventive effects, and has certain therapeutic and eradicative effects; it can be used for healing wounds, sterilization and anti-inflammatory, and treatment. Some skin diseases; can also be used for preservation and preservation of fruits during storage.
Because copper fungicides are characterized by low toxicity, pollution-free and environmentally friendly, they are the preferred fungicides for the production of green foods, organic fruits and pollution-free foods. The copper bactericide sprayed on the crop is strong, forming a layer of film, resistant to rain and scouring, long-lasting effect, can prevent the invasion of bacteria for a long time, so the control effect is better. With copper bactericides, it is difficult to develop disease resistance.
Copper bactericides have so many advantages that they will inevitably lead to the development and utilization of such preparations.
Currently developed inorganic copper preparations are: basic copper sulfate (bordeaux liquid), copper oxychloride (king copper), cuprous oxide (copper master, backing), copper hydroxide (can be killed, crown bacteria, abundance Security, Ruifu 2000) and so on.
However, the long-term continuous use of inorganic copper bactericides has a problem that cannot be ignored, that is, it is easy to induce the proliferation of mites and cause mites. Observed in many years of production, long-term use of inorganic copper fungicides on cotton to prevent angular spot disease, anthracnose in seedling stage, and blight are easy to cause early emergence and multiple occurrence of cotton leaf mites, resulting in cotton deciduous stalks; beans, peppers The use of inorganic copper bactericides on tomatoes, eggplants and other vegetables to control epidemic diseases, anthracnose, and bacterial wilt, etc., may cause a large number of oviposition and value-added of the sassafras, resulting in dry and detached leaves.
There are three main reasons why inorganic copper fungicides induce the proliferation of mites (red spiders):
First, the bactericidal mechanism of the inorganic copper preparation is that copper ions can rapidly destroy the protease of the pathogenic bacteria and cause the bacteria to die, but the plant cell structure is not destroyed, and the crop is safe, but has no killing effect on the mites;
Second, the copper ions of the inorganic copper preparation supplement the trace elements of the crop, promote the growth of the crop, stimulate the color of the fruit and vegetables, improve the quality, and grow green and lustrous, thus attracting the inhabiting, feeding, breeding and stimulating a large number of eggs;
Third, the inorganic copper bactericide has no killing effect on cockroach pests, but it has a killing effect on its natural enemies, which causes the cockroach to proliferate out of control and cause cockroaches to occur, causing serious damage.
In view of this, in the application of inorganic copper fungicides to control diseases, it is necessary to take into account the easy to induce the proliferation of mites. In the sputum-prone areas or dry seasons, the application of inorganic copper bactericides should be used interchangeably with other bactericides. Do not use inorganic copper bactericides several times in a row.
In addition to inorganic copper preparations, there are organic copper bactericides on the market. Organic copper preparations are safer, more convenient, and more pollution-free.
At present, the common organic copper preparations on the market mainly include: thiabium copper (Longkes) (20% SC), lysine copper (xiaoxianling, copper sulphate), fatty acid copper, copper rosinate (green copper), Copper succinate, copper dibasic acid (copper succinate, BT), copper sputum, copper quinolate, copper soap and copper sulfonate.
The development and utilization of organic copper preparations has become a hot topic in the production of agricultural fungicides. Among them, the new national invention patent product of Zhejiang Longwan Chemical Co., Ltd., Longke bacteria (thiazobacteria), has been listed as “national key new productâ€. And the “Non-polluted pesticide varieties promoted by the Ministry of Agricultureâ€, as the recommended pesticide varieties for the production of pollution-free agricultural products, were listed as “new pollution-free pesticides by the National Agricultural Technology Center and 18 provincial plant protection and phytosanitary stationsâ€. .
At the same time, various mixed preparations of copper preparations and other fungicides have appeared on the market, such as: morpholinium hydrochloride, copper, nail cream, copper (remediation copper), nail cream, aluminum, copper, lycopene, zinc (anti-drying, anti-dry spirit), mixed amino acid copper · zinc · manganese · magnesium, plant disease, copper humate (843 healing agent).
Zhejiang Longwan Chemical Co., Ltd. created the invention of Longke bacteria (thiazobacteria), mainly relying on thiadiazole sterilization and copper ion assist, and the copper ion content in the field dilution spray is relatively small. Longke bacteria (thiazobacteria) has "three major advantages": First, it is not easy to induce the proliferation of mites (red spiders); second, it can be mixed with most other acidic pesticides, which is convenient and safe; third is not easy Produces phytotoxicity and can be used during flowering and young fruit.
Longke bacteria (thiazobacteria) is an ideal agent for controlling bacterial diseases of crops. It has special effects on bacterial diseases and is called "the expert of prevention and treatment of bacterial diseases" by farmers. Longke bacteria (thiazobacteria) can be applied by seed soaking, seedling pouring, transplanting root and field spray or root irrigation or rough spraying, which is a complete solution to prevent bacterial diseases.
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