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Fungicides Usage Classification
Oct 13, 2017

Fungicides are also known as fungicides, fungicides, microbicides, etc., which are usually the chemical agents that can effectively control or kill the microorganisms in the water system -- bacteria, fungi, and algae. Internationally, it is often used as a general term for the treatment of various pathogenic microorganisms.

The main kinds of

Fungicides are also known as fungicides, fungicides, microbicides, etc., which are usually the chemical agents that can effectively control or kill the microorganisms in the water system -- bacteria, fungi, and algae. There are two kinds of agricultural fungicides and industrial fungicides.

Agricultural fungicides

It is used for the prevention and control of plant diseases caused by various pathogenic microorganisms, and generally refers to the fungicide. Internationally, however, it is often used as a general term for the treatment of various pathogenic microorganisms. With the development of fungicides, the subclasses of fungicide, viricide and algicide are also distinguished.

Industrial fungicide

According to the sterilization mechanism can be divided into oxidative fungicides and non-oxidizing fungicides. Oxidative fungicides are usually powerful oxidants, which can be sterilized by oxidative effect of metabolic enzymes in bacteria. The commonly used oxidizing fungicides are chlorine, chlorine dioxide, bromine, ozone, hydrogen peroxide, etc. Non oxidizing bactericide is the way that agents apply to specific parts of microorganisms, thereby destroying microbial cell or organism and reach the effect of sterilization, common non oxidizing bactericides are chlorophenol, different thiazole moiety ketone, quaternary ammonium salt, etc.

Fungicides are divided according to the source, except for agricultural antibiotics belonging to biogenic fungicides, the main varieties are chemical synthetic fungicides, and fungicides are a class of agents used to control plant diseases. Any potion that kills or inhibits the growth of the pathogen without interfering with the normal growth of the plant, collectively referred to as fungicide. Fungicides can be classified according to the way of action, source of raw materials and chemical composition.

Classification of the use of fungicides

Protective agent

Protective agent in pathogenic microorganisms before have no contact or not in plant body, use drug treatment plants or surroundings, suppressing pathogen spores germination of pathogen spores germination or killed, in order to protect the plants from its harm, this effect is called protection. The agent with this effect is the protectant. Such as bordeaux liquid, dyson zinc, copper sulfate, green milk copper, zinc, bacillus and so on.

Therapeutic agent

The pathogenic microorganism of the therapeutic agent has been immersed in the plant, but the symptoms of plant performance are in the incubation period. The drug infiltrates plant tissue from the epidermis of the plant to kill or inhibit the pathogen by transmission, diffusion, or generation of metabolites, so that the strain no longer suffers and recovers. A drug that has this therapeutic effect is called a therapeutic or chemical treatment. Such as methyl tobuzin, polymycin, spring reomycin, etc.

3. The eradicative agent refers to the pathogen that can directly kill the pathogen that has invaded the plant after the plant is sick. This eradicating agent is the eradicator. Such as fomei arsenic, pentachlorophenol sodium, sulfur mixture and so on.

Important features

There are two kinds of antiseptic agents: one is protective fungicide, and the other is the endoscoped fungicide. Protective bactericide contact with pathogenic bacteria directly in the plant in vitro or in the body surface, killing or inhibiting the pathogenic bacteria, so that it cannot enter the plant, thus protecting the plant from the harm of pathogenic bacteria. This kind of fungicide is known as protective bactericide, and its function has two aspects: one is that the agent is exposed to the pathogen directly to kill the pathogen, namely, "contact sterilization". The other is to spray the agent on the surface of the plant, and when the pathogen falls into the plant and comes into contact with the agent, it is poisoned, which is called "residual effect of bactericidal action".

Different fungicides are used differently. The protective bactericide, as protective agent, is used to prevent protective effects on the plant surface before infection. Elimination of infected bacteria at the site of the application is known as the elimination of antibacterial agents; It can be absorbed by plants and transmitted to pathogens in the body. It is called an endoscopical fungicide, and many of the eradicators are internal agents, and most of them have chemical treatment effects. Therefore, it is often simple to divide the bactericide into protective and endoscopicity. The mechanism of their action can be broadly divided into two categories:

1. Interfere with the respiratory process of germs and inhibit the production of energy.

2. Biosynthesis of biological substances such as proteins, nucleic acids, sterols, etc. Protective fungicides are mostly products that have a wide germicidal spectrum and are less germicidal. Endoscopic bactericide general bactericidal force is stronger, the bactericidal spectrum is narrower, some of which have the selective toxicity to certain pathogenic bacteria. Because the endosuction is relatively simple in the bacteria, the bacteria can be resistant to the mutation of the genetic gene. In order to avoid or delay the production of drug resistance, it is usually possible to choose the appropriate protective agent and inner suction mixture to be used or rotated, so that the better prevention effect can be obtained. According to the characteristics of the disease, various methods such as seed treatment, leaf spraying and soil treatment should be adopted.