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Do You Know The Four Families Of Fungicides?
Dec 05, 2018

Category 1: Protective fungicides. The main function of protective fungicides is to form a film on the surface of plants after application, so that pathogens can not be infected. Such fungicides are particularly effective for airborne pathogens, such as controlling downy mildew of many crops with Bordeaux solution; treating plant seeds or seedlings can prevent the infection of seed-borne diseases, such as Triadimefon seed dressing can prevent smut of cereals; carbendazim dipping in sweet potato seedlings to control seedling diseases; fumeishuang and carbendazim soil treatment can prevent and control seedling diseases. Control of soil-borne diseases of many crops, such as sudden collapse and standing blight.

Category 2: Eradicative fungicides. These fungicides have direct and strong killing effect on pathogenic bacteria, but they can not be tolerated by growing plants, so they can only be used for soil treatment, plant dormancy or seedling treatment before sowing. Formalin sterilized seeds are common, and tebuconazole can eradicate wheat stripe rust and powdery mildew.

Category 3: Therapeutic fungicides. After susceptibility to plant diseases, some non-endogenous fungicides, such as sulfur, can be used to kill bacteria directly, or with endogenous fungicides, can penetrate into plant tissues, kill bacteria, or use endogenous fungicides to directly enter the plant body and play a therapeutic role with the transmission of plant body fluids. Common carbendazim, toprazine, spring ramycin, pyrimethyl chlorothalonil and so on.

Category 4: Anti-disease activator. After the fungicides treat plants, the substances that induce plant disease resistance by identifying pathogenic bacteria are plant disease-resistant activators. But this kind of medicine can not directly show bactericidal activity, but be used for a long time to resist disease, so it is not easy to produce resistance. Common medicines are oxalic acid, benzothiadiazole and allylbenzothiazole.