What are the types of fungicides?

What are the types of fungicides? What is the main function? Please also know the netizens to help introduce fungicides that kill, inhibit or neutralize the toxic metabolites of pathogens at a certain dose or concentration, so as to protect plants and their products from germs or eliminate diseases and symptoms. the planting network has sorted out the characteristics of fungicides, which are listed in detail for the majority of netizens' reference. Type one, protective fungicides: this kind of fungicides can protect the application parts that are not infected by bacteria, from the infection of bacteria, and need to be sprayed before the crops come into contact with diseases or diseases. Generally, before the epidemic of the disease, it is applied to the potentially damaged parts of the plant to protect the plant from the disease. The main way of action of the protective fungicide is to form a drug film on the plant surface after the application, so that the pathogen can not be infected. Common are Bordeaux solution, stone-sulfur mixture, mancozeb, mancozeb and so on. Species 2, eradication fungicides: these fungicides have a direct and strong killing effect on pathogens, but in the plant growth period, plants can not stand this kind of fungicides, so they can only be used in soil treatment, plant dormancy period or seedling treatment before sowing. The common ones are disinfected seeds of formalin, and strychnine can eradicate wheat stripe rust and powdery mildew properly. Type 3, therapeutic fungicides: this kind of fungicides, also known as internal absorbents, can inhibit the development of germs in all parts of the plant and kill them after being absorbed and transmitted by plants. The common ones are carbendazim, thiophanate, Chunramycin and so on. Category 4, disease resistance activators: after the treatment of plants with this kind of fungicides, the substances that induce disease resistance of the whole plant by identifying pathogens are the disease resistance activators of plants. However, this agent can not directly show bactericidal activity, but will be resistant for a long time after using it for a long time, so it is not easy to produce resistance. The common agents are oxalic acid, benzothiadiazole and allylbenzothiazole. The effect of tebuconazole on Chunramycin