Function of fungicide
What are the important functions of fungicide manufacturers? There are two ways of action of fungicides: one is a protective fungicide, and the other is an internal fungicide. Protective fungicides are directly in contact with pathogenic bacteria in vitro or on the surface of the plant, killing or inhibiting pathogenic bacteria so that they cannot enter the plant, thereby protecting the plant from the harm of pathogenic bacteria.
This kind of fungicide is called protective fungicide, and its effect has two aspects: first, the agent is sprayed after contact with pathogenic bacteria to directly kill pathogenic bacteria, that is, "contact bactericidal effect"; The other is to spray the agent on the surface of the plant body, when the pathogenic bacteria fall on the plant body to contact the agent and be poisoned, called "residual bactericidal effect".
Different fungicides work in different ways. The protective fungicide is a protective agent applied to the plant surface before infection. In the application site can eliminate infected bacteria, called eradication fungicide; Can be absorbed by the plant and transmitted to the infected part of the bacteria in the body to destroy the bacteria, called the internal fungicide, many eradication agents are also internal absorbent, most of the two have chemical treatment. Therefore, in practice, fungicides are often simply divided into two modes of action: protective and endogenic. Their mechanism of action can also be roughly divided into two categories:
1, interfere with the respiratory process of bacteria, inhibit energy production.
2, interfere with the biosynthesis of bacterial life substances such as proteins, nucleic acids, sterols, etc. Most of the protective fungicides are products with broad bactericidal spectrum and low bactericidal power. Endogenic fungicides generally have strong bactericidal power and narrow bactericidal spectrum, and some of them have specific selective toxicity to certain pathogens. Because of the single point of use of endosorbent in bacteria, bacteria are easy to develop resistance by genetic mutations.
In order to avoid or delay the generation of resistance, it is usually possible to choose the appropriate protective agent and internal absorbent mixed application or rotation, so that you can learn from each other to get a better control effect. Various application methods such as seed treatment, leaf spraying and soil treatment should be adopted according to the characteristics of disease occurrence.
