What are the effects of fungicides?

What are the effects of fungicides? Please introduce that there are two ways of action of fungicides: one is protective fungicides, the other is internal fungicides. Protective fungicides come into direct contact with pathogens in vitro or on the body surface of plants, killing or inhibiting pathogens, making them unable to enter plants, so as to protect plants from pathogens. This kind of fungicide is called protective fungicide, and its function has two aspects: one is to directly kill the pathogen in contact with the pathogen after spraying, that is, the "contact germicidal effect"; the other is to spray the fungicide on the surface of the plant, when the pathogenic bacteria are poisoned when they come into contact with the drug on the plant, it is called "residual germicidal effect". There are mainly the following categories of protective fungicides: sulfur and inorganic sulfur compounds, such as sulfur suspending agents, solid stone sulfur mixtures, etc.; copper preparations, mainly Bordeaux solution, cupric ammonia mixture, etc.; organic sulfur compounds, such as thiram, mancozeb, mancozeb, phthalimide, such as carbendan, dicarbendan and bacteridan, antibiotics, such as Jinggangmycin, germicidal, polyoxymycin, etc. Other kinds, such as Ye Ku Ling, Ye Ku Jing, Chlorothalonil, he Sui Ning and so on. Internal absorbent fungicides can be absorbed by crops and transported to other parts of the body after they are applied to a certain part of the body. There are two modes of transmission of endogenic insecticides: one is apical transmission, that is, after the drug is absorbed into the plant, it is transmitted to the apical leaf, terminal bud, leaf and leaf margin along with the transpiration flow to the top of the plant. At present, most of the internal absorption fungicides belong to this category. The other is the basal conduction, that is, the drug is absorbed by the plant and conducts downward along the transport of photosynthetic products in the phloem. There are mainly the following categories of internal absorption fungicides: benzimidazoles, such as carbendazim, carbendazim, thiabendazole, thiophanate, carbendazim, carbendazim, thiophanate, carbendazim, carbendaz Sterol biosynthesis inhibitors, such fungicides include tridecomorph, azinoline, butyl, methylmycin and ethidium, imidazole and imidamide, triazole and triadimefon, etc. they belong to morpholine, pyridine, pyridine, imidazole and 2line 4-triazole compounds respectively. Sterol synthesis inhibitor fungicides have both protective and therapeutic effects and have a wide germicidal spectrum. The principle of fungicides in the control of plant diseases: to put it simply, fungicides are compounds that have toxic effects on pathogenic microorganisms. However, the meaning of the word "sterilization" is not limited to "killing" the growth of pathogenic microorganisms or spore germination. Fungicides that can kill pathogenic microorganisms play a bactericidal effect, and fungicides that can inhibit the germination or growth of pathogenic spores have bacteriostatic effects, both of which can achieve the purpose of disease prevention and treatment in agricultural production. Fungicides act in different ways and are used in different ways, but fundamentally speaking, there are no more than three principles for fungicides to control diseases, namely, chemical protection, chemotherapy and chemical immunity. Click to get more fungicide use technology click to get more pesticide use technology