Fungicides Are Classified According To The Way They Are Used

1. Protective agent
Before the pathogenic microorganisms contact the plant or immerse the plant, the plant or the surrounding environment is treated with a medicament to inhibit the germination of the pathogenic spores or kill the germinated pathogenic spores to protect the plant from its damage. This effect is called protection effect. Agents with this effect are protective agents. Such as Bordeaux mixture, zinc zinc, copper sulfate, green milk copper, mancozeb, chlorothalonil and so on.
2. Therapeutic agents
The pathogenic microorganisms of the therapeutic agent have infiltrated the plant, but the plant shows symptoms and is in the incubation period. The drug penetrates into the plant tissue from the epidermis of the plant, and kills or inhibits the pathogen through transduction, diffusion, or production of metabolites, so that the diseased plant will no longer suffer and restore health. Agents that have this therapeutic effect are called therapeutic or chemotherapeutic agents. Such as thiophanate-methyl, carbendazim, kasugamycin and so on.
3. Eradicating agent
Eradicants refer to pathogens that can directly kill pathogens that have invaded plants when they are applied after the plants are infected. Agents with such an eradicating effect are eradicating agents. Such as thiram, sodium pentachlorophenate, lime sulfur and so on.