Nowadays, it has entered the cold season, and the vegetable diseases in greenhouses have entered a high-risk period. Recently, the author discovered through investigations in the vegetable area that some vegetable farmers have some doubts and misunderstandings when using fungicides, especially copper-based fungicides, and they believe that they have no credibility. The attitude of high-cost prevention, one to waste control costs, and miss the best prevention period.

With the increasing number of fungicides in recent years, some new fungicides have shown superior control performance and excellent efficacy in the field of agricultural control, and have gradually replaced traditional fungicides, but for new fungicides. Due to the influence of unfavorable factors such as the increase in concentration resistance, some restrictive effects are also exerted. From the perspective of crop control effect and cost, it is particularly urgent to seek alternative products, which is especially important for the use of copper elements with relatively low cost.

The role of copper element fungicide

Copper element fungicide can not only prevent fungal diseases, but also prevent bacterial diseases; it has protective and preventive effects, and at the same time has both therapeutic and eradicative effects; it can heal wounds, sterilize and eliminate inflammation, and can also treat certain skin diseases; It is used for preservation and preservation of certain fruits during storage.

Sterilization principle of copper element bactericide

The copper element bactericide mainly relies on the release of copper ions and the groups of -SH, -NH3, -COOH, and -OH in the protein of the fungus to act to kill the bacteria. Wherein -SH represents an fluorenyl group, -NH3 represents an amino group and nitrogen, -COOH represents an acid; -OH represents a hydroxyl group and a base.

Characteristics of copper elemental fungicide

The copper element bactericide has strong adhesiveness, rapidly forms a drug film, is resistant to rain, and has a long-lasting effect, which can prevent the invasion of bacteria in a long time, so the control effect is good. At the same time, it is not easy to produce drug resistance in long-term use.

Copper element fungicide has the characteristics of low toxicity, pollution-free and environmental protection. It has become the first choice for producing green food and organic fruits.

Classification of copper element fungicides

Copper element fungicides can be divided into inorganic copper and organic copper. At present, the market is still dominated by inorganic copper preparations. Common preparations include: cuprous oxide (master copper), copper sulfate, basic copper sulfate, copper oxychloride (king copper) and copper hydroxide (killable). Common preparations of organic copper include: copper acetate, copper quinoline, copper rosinate, copper thiabium, copper sputum, copper amber, copper humate, copper amide, copper amino acid and the like.

Characteristics of inorganic copper fungicide

In combination with the performance characteristics of inorganic copper bactericides and sterilization, the following points should be noted when using them for disease prevention:

1. Because the liquid medicine is alkaline, it can not be mixed with acidic pesticides;

2. It is easy to produce phytotoxicity when used in sensitive periods such as flowering and young fruit of crops;

3, the sterilization spectrum is narrow, easy to be allergic to individual crop varieties;

4, some crops are easy to induce or stimulate the occurrence of mites and scale insects. The main reason for the occurrence of mites is that inorganic copper mainly destroys the protease of pathogenic bacteria and causes the bacteria to die, but does not destroy the plant cell structure. Therefore, it is safe for crops, but has no killing effect on mites, but no mites for mites. It has a killing effect, 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 addition, the use of copper fungicides not only can supplement the trace elements required for some crops, but also promote crop growth, stimulate fruit color and improve quality. At the same time, it can trap the cockroaches to inhabit, feed, and breed, and stimulate the mites to lay eggs in large quantities;

Characteristics of organic copper fungicide

According to the mode of action of organic copper and the original sterilization, the main aspects are mainly reflected in the following aspects:

1. Neutral-based, broad-spectrum compounding, can be mixed with most fungicides, insecticides and plant growth regulators ;

2, it is not easy to cause and stimulate the occurrence of mites (rust tick) and scale insects;

3, a wide spectrum of sterilization, relatively safe and reliable, not easy to produce phytotoxicity;

4, does not contain CU2+, does not hurt the flower, can be used in all periods;

5, CU element content is low, low residue, low pollution, is conducive to environmental protection;

6, CU ions and compounds double sterilization, efficient and thorough;

7. Promote the absorption of Fe ions, Al ions and other elements to play the role of strong seedlings;

Copper element fungicide use attention

Because the organic copper and inorganic copper of the copper element bactericide have different characteristics and sterilization methods, it is necessary to consider crop safety while ensuring the eradication of diseases, so the following aspects should be noted when using copper element bactericide:

1. Cross-use as many times as possible in the sputum-prone areas or dry seasons;

2, when used on cotton, it is easy to cause early and frequent hair loss, resulting in cotton stalks "stalks";

3, beans, peppers, tomatoes, eggplants and other vegetables use easy to cause a large number of eggs, increase in value, easily lead to dry off;

4. Use it cautiously during high temperature and high humidity environment.

More pesticide knowledge , please pay attention to China Pesticide Network

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