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Fungicides Mechanism Of Action
Aug 31, 2017

Fungicides, also known as biocides, bactericidal algae, microbicides, etc., usually refers to the effective control or kill the water system of microorganisms - bacteria, fungi and algae chemical agents.

Fungicides, also known as biocides, bactericidal algae, microbicides, etc., usually refers to the effective control or kill the water system of microorganisms - bacteria, fungi and algae chemical agents. Mainly divided into two kinds of agricultural fungicides and industrial fungicides.

Agricultural fungicide

Is used to control a variety of pathogenic microorganisms caused by plant diseases, a class of pesticides, generally refers to fungicides. But the international community, usually as a control of various types of pathogenic microorganisms of the general term. With the development of fungicides, but also distinguish between the killing agent, kill the virus, algae and other subclass.

Industrial fungicides

According to the sterilization mechanism can be divided into two kinds of oxidizing fungicides and non-oxidizing fungicides. Oxidative fungicides are usually strong oxidants, mainly through the bacteria with the metabolism of bacteria in the body to achieve the purpose of sterilization. Commonly used oxidative fungicides are chlorine, chlorine dioxide, bromine, ozone, hydrogen peroxide and so on. Non-oxidizing fungicides in the form of toxic agents in the special parts of microorganisms, thereby destroying microbial cells or living body to achieve bactericidal effect, common non-oxidizing fungicides are chlorophenols, isothiazolinones, quaternary ammonium salts Wait.

Fungicides by source, in addition to agricultural antibiotics are biogenic fungicides, the main varieties are chemical synthetic fungicides, fungicides is a class of drugs used to control plant diseases. Any medicine that kills or inhibits the growth of pathogens, but does not prevent the normal growth of plants, collectively referred to as fungicides. Fungicides can be classified according to the mode of action, the source of raw materials and the chemical composition.

According to the use of fungicides classification

The protective agent treats the plant or the surrounding environment with the agent before the pathogenic microorganism has no contact with the plant or is not immersed in the plant, to inhibit the spore germination or kill germ spores to protect the plant from harm, which is called protection effect. The agent having such a function is a protecting agent. Such as Bordeaux liquid, on behalf of the zinc, copper sulfate, green milk copper, mancozeb, chlorothalonil and so on.

The therapeutic agent pathogenic microorganisms have been immersed in the plant, but the plant is in the incubation period. Drugs from the plant epidermis into the plant tissue, the transmission, proliferation, or produce metabolites to kill or inhibit pathogens, so that the disease is no longer affected, and to restore health. An agent having such a therapeutic effect is called a therapeutic or chemotherapeutic agent. Such as methyl thiophanate, carbendazim, juniperin and so on.

3, the eradication of the device refers to plant disease after the application can directly kill the plant has been invading the pathogen. The agent having such a reducing action is a scavenger. Such as the United States arsenic, sodium pentachlorophenate, stone sulfur mixture.

Fungicide acts in two ways: First, the protective fungicide, the second is the suction fungicide. Protective fungicides in the plant in vitro or body surface directly contact with pathogens, kill or inhibit pathogens, so that they can not enter the plant, so as to protect the plant from pathogens hazards. Such fungicides known as protective fungicides, its role in two aspects: First, after spraying agents and pathogens contact directly kill pathogens, that is, "contact sterilization"; the other is the agent sprayed on the surface of the plant , When the pathogen falls on the plant body exposed to the drug and was poisoned, known as the "residual effect of bactericidal effect."

Different fungicides are also used in different ways. In the case of bacteria before the infection on the surface of the plant from the protective effect, known as the protective fungicide that is protective agent; in the application site to destroy the infected bacteria, known as the eradication of fungicides; can be absorbed by plants and In vivo conduction to the site of the infection of bacteria and the eradication of bacteria, known as the suction fungicide, many of the eradication agent is also within the suction, the two most of the role of chemotherapy. Therefore, it is easy to simply divide the fungicide into protective and inhalation modes. Their mechanism of action, can also be broadly divided into two categories:

1, interfere with the respiratory process of bacteria, inhibit the generation of energy.

2, interference with the biological life of proteins such as protein, nucleic acid, sterols and other biosynthesis. Most of the protective fungicides are broadly sterilized and have low bactericidal products. Inhalation of fungicides generally strong bactericidal, sterilization spectrum is narrow, some of which species of a certain pathogen has a specific choice of toxicity. As the internal action of bacteria in the bacteria point of action is relatively simple, bacteria easily mutated by the genetic resistance. In order to avoid or delay the production of drug resistance, usually choose the appropriate protective agent and internal admixture mixed use or rotation use, so take a long complement to get a better control effect. In accordance with the characteristics of the disease should be used to take seed treatment, foliage and soil treatment and other application methods.