There are two modes of action of the bactericide: one is the protective bactericide and the other is the sterilizing agent.
The protective fungicides are in direct contact with the pathogens in vitro or on the surface of the plants, killing or inhibiting the pathogenic bacteria so that they cannot enter the plants, thereby protecting the plants from pathogenic bacteria. Such fungicides are called protective fungicides, and their effects are in two aspects: First, the agent is sprayed and contacted with pathogens to directly kill pathogens, that is, "contact bactericidal action"; second, the agent is sprayed on the surface of the plant body. When the pathogenic bacteria land on the plant body is poisoned by exposure to agents, it is called "residual bactericidal effect."
The protective fungicides mainly include the following types: sulfur and inorganic sulfur compounds such as sulphur suspending agents, solid stone sulphur compounds, etc.; copper preparations, mainly Bordeaux fluids, copper ammonia compounds, etc.; organic sulphur compounds, such as thiram, dexamethasone Zinc, zesinammonium, mancozeb, etc.; guanidinoammoniums, such as captan, propidium, and bactericide; antibiotics, such as jinggangmycin, streptozotocin, and polyoxin; Other types, such as Ye Ling Ling, Ye Bingjing, chlorothalonil, saccharin and so on.
After the systemic fungicide is applied to a certain part of a crop plant, it can be absorbed by the crop and transported in the body to other parts of the crop body. A fungicide with such properties is called a "systemic fungicide." Systemic insecticides have two kinds of conduction methods: First, to the top of the conduction, that is, after the agent is absorbed into the plant body, with the transpiration flow to the top of the plant to the top leaves, the top buds and leaves, leaf margins. The current systemic bactericides are mostly of this type. The other is the basic conduction, that is, the agent is absorbed by the plant body and is conducted down the transport of photosynthetic products within the phloem.
The systemic fungicides mainly include the following types: benzimidazoles, such as benomyl, carbendazim, thiabendazole, thiophanate-methyl, thiophanate-methyl, etc.; dimethylimides, such as eubacteria. Urea, vinyl nucleus, etc.; organic phosphorus, such as rice bran net, different rice bran net, triethylphosphonate, etc.; phenyl amides, such as metalaxyl; sterol biosynthesis inhibitors, such sterilization Agents include tridemorpholine, oxazin, dibutyl, trimethoprim and ethacridine, imazalil, imidazole, triadimenol, and triadimefon. From the chemical structure, they belong to morpholine, respectively. Pyridinoline, pyridine, pyrimidine, imidazole, 2,4-triazole compounds. The sterol synthesis inhibitor fungicides have a protective effect and a therapeutic effect, and the bactericidal spectrum is wide.
The principle of fungicides for controlling plant diseases: In simple terms, fungicides are compounds that are toxic to pathogenic microorganisms. However, the term “bactericidal†is not limited to the meaning of “killing†the growth of pathogenic microorganisms or the spore germination. The fungicide capable of killing pathogenic microorganisms acts as a bactericidal effect, and the fungicide capable of inhibiting the germination or growth of pathogenic spores acts as a bacteriostatic effect, both of which can achieve the purpose of disease prevention and treatment in agricultural production. Fungicides have different modes of action and methods of use, but fundamentally speaking, the principle of fungicides in preventing and controlling diseases is nothing more than three, namely chemical protection, chemical treatment and chemical immunity.
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