Pesticide fungicides are a popular pesticide variety in the agricultural market. Different fungicide products can treat different diseases and can be basically divided into the following four categories:
Category 1: Protective fungicide:
The main mode of action of the protective fungicide is to form a film on the surface of the plant after application, so that the germ can not be infected.
Such fungicides are particularly effective for airborne spread of bacteria, such as the use of Bordeaux mixture to control downy mildew of various crops; treatment of plant seeds or seedlings can prevent infection of seed-borne diseases, such as triadimefon seed dressing can control Cereal smut; carbendazim soaked sweet potato seedlings to prevent seedling diseases; Fumeishuang, carbendazim soil treatment can control soil-borne diseases of various crops, such as squatting disease and blight.
Category 2: Exterminating fungicides:
This kind of fungicide has a direct and strong killing effect on pathogenic bacteria, but plants can not tolerate such agents in the plant growth period, so they can only be used for soil treatment, plant dormancy or seedling treatment before planting. Commonly used formalin-sterilized bacteria seeds, tebuconazole has a detrimental effect on wheat stripe rust and powdery mildew.
Category 3: Therapeutic fungicides:
After the plant is susceptible to disease, some non-systemic fungicides, such as sulfur, can be used to directly kill the pathogen, or a fungicide with an infiltration effect can penetrate into the plant tissue, kill the bacteria, or directly enter with a systemic fungicide. A bactericidal agent that acts as a therapeutic agent in the body of plants. Common are carbendazim, thiophanate, chrysanthemum, azoxystrobin and other chlorothalonil.
Category 4: Disease Resistance Activator:
After the plant is treated with the fungicide, the substance that induces disease resistance of the whole plant by identifying the pathogenic bacteria is an anti-pathogenic activator of the plant.
However, this agent does not directly exhibit bactericidal activity, but is resistant to disease for a long time after use for a few days, so that resistance is not easily generated. Common agents are oxalic acid, benzothiadiazole, and allyl benzothiazole.
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