Fungicides for the prevention and treatment of plant diseases caused by various pathogenic microorganisms, a class of pesticides, generally refers to fungicides, bactericides. International, usually is a general term as an agent for prevention and treatment of various types of pathogenic microorganisms. With the development of fungicide, bactericide distinguish virucide, algaecidal subcategories. According to the survey, the world there are more than 80,000 kinds of pathogenic microorganisms harmful to plants (fungi, strong bacteria, rickettsia, mycoplasma, viruses, algae, etc.). Plant diseases caused huge losses to agriculture, crops around the world thus average annual reduction in yield of about 500Mt. History has repeatedly occurred the scourge caused severe famine due to a plant disease epidemics, and even a large number of people starve to death. The use of fungicides is a cost-effective method for control of plant diseases.
Two ways: First, the mode of action of fungicides protective fungicides, Fungicide. Protective fungicides in plants in vitro or body surface directly in contact with the pathogen to kill or inhibit pathogens, so that can not enter the plant, thereby protecting plants from pathogens harm.
The fungicides used in a variety of ways, each use are designed according to the law of disease occurrence. Common use: field ground crop spraying, soil sterilization and disinfection of inoculum three.