Bactericides fall into four main categories

Fungicides are one of the most popular pesticides on the market. Different fungicides can treat different diseases. Basically, they can be divided into the following four categories: Category I: Protective fungicides. Its main function is to form a layer of film on the surface of the plant after application, so that the bacteria can not be infected. Such bactericides are particularly effective against airflow-borne pathogens, such as the control of downy mildew in many crops with Bordeaux mixture; the treatment of plant seeds or seedlings to prevent the infection of species-borne diseases, such as the use of triadimefon seed dressing in the prevention and control of cereals Head smut; carbendazim dipping sweet potato seedlings to prevent seedling disease; Fumei double, carbendazim soil treatment of a variety of crops soil-borne disease damping-off and blight.

Category 2: Eradication fungicide. This type of bactericide has a direct strong killing effect on pathogenic bacteria, but plants in the growing period are not tolerant to such agents and therefore can only be used for soil treatment, dormancy or treatment of seedlings before sowing. Commonly used formalin-sterilized seeds, tebuconazole was used to remove wheat stripe rust and powdery mildew.

Category 3: Therapeutic fungicides. After the crop is affected, some non-inhaled fungicides, such as sulfur, can be used to kill the bacteria directly, or the infiltrating fungicide can be used to infiltrate into the interior of the plant tissue to kill the bacteria, or to directly enter the plant with a systemic fungicide. , with the plant fluid transport and treatment. Common carbendazim, thiophanate, kasugamycin, azoxystrobin chlorothalonil and so on.

Category 4: Anti-disease activators. Such fungicides induce whole plant disease resistance by recognizing pathogenic bacteria, and cannot directly exhibit bactericidal activity, but rather they are resistant to disease for a long time after being used for a few days, so that resistance is not easily generated. Common agents are oxalic acid, benzothiadiazole, allylbenzazole.

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