Fungicides

Fungicides are a type of pesticide used to control plant diseases caused by various pathogenic microorganisms. Fungicides are divided into inorganic fungicides and organic fungicides based on their chemical composition. There are three types of inorganic fungicides: sulfur fungicides, copper fungicides, and mercury fungicides; Organic fungicides can be divided into organic sulfur (such as mancozeb), trichloromethyl sulfide (such as captan), substituted benzene (such as Chlorothalonil), pyrrole (such as seed dressing), organic phosphorus (such as aluminum ethophosphate), Benzimidazole (such as Carbendazim), triazole (such as triadimefon, triadimenol), phenylamide (such as metalaxyl), etc.

According to the prevention and cure objects, It can be divided into Fungicide, bactericides, virus killers, etc. According to the Mode of action, it can be divided into protective fungicides, inhalable fungicides, etc. According to the source of raw materials, it can be divided into chemical synthetic fungicides, agricultural antibiotics (such as jinggangmycin, agricultural antibiotic 120), plant fungicides, plant Defensin, etc. According to the mechanism of pesticide killing, it can generally be divided into two categories: oxidizing and non oxidizing fungicides. For example, chlorine, Sodium hypochlorite, bromine, ozone and chloramine are oxidizing bactericides; Quaternary ammonium cation, dithiocyanomethane, etc. are non oxidizing fungicides.

1. Precautions for using fungicidesWhen choosing fungicides, it is important to understand their properties. There are two types of fungicides, one is protective agent, which is used to prevent plant diseases, such as Bordeaux mixture liquid, mancozeb, Carbendazim, etc; Another type is therapeutic agents, which are applied after the onset of plant disease to kill or inhibit pathogenic bacteria invading the plant body. Therapeutic agents have good effects in the early stages of disease, such as compound fungicides such as Kangkuning and Baozhida.

2. Fungicides should be sprayed before 9am or after 4pm to avoid use under scorching sun. If sprayed under scorching sun, the pesticide is prone to decomposition and evaporation, which is not conducive to crop absorption.

3. Fungicides cannot be mixed with alkaline pesticides. Do not arbitrarily increase or decrease the amount of fungicides used, and use them as needed.

4. Fungicides are mostly powders, emulsions, and suspensions, and must be diluted before application. When diluting, first add medicine, then add water, and then stir with a stick. When mixed with other pesticides, the fungicide should also be diluted first and then mixed with other pesticides.

5. The interval between applying fungicides is 7-10 days. For agents with weak adhesion and poor internal absorption, they should be sprayed again in case of rain within 3 hours after spraying.