Agricultural fungicides are a class of pesticides used to prevent and control plant diseases caused by various pathogenic microorganisms, generally referring to fungicides. However, in the world, it is usually used as a general term for the prevention and treatment of various pathogenic microorganisms. With the development of fungicides, subcategories such as bactericides, virucides, and algaecides are distinguished.
As the saying goes:Pest production is reduced, and disease harvest is lost!Fungicides play an extremely important role in agricultural production, and scientific and rational use has a protective and promoting effect on crops.
The classification of fungicides is generally classified according to the function of fungicides, which can be divided into protective agents, ** agents, eradicators and ** protective agents.
1. The principle of this kind of agent is to inhibit the germination of pathogenic spores or kill the germinating pathogenic spores to protect plants from harm. Such as copper sulfate, copper green milk, mancozeb, Bordeaux liquid, zebden, chlorothalonil, etc.
2. This kind of drug penetrates into the plant tissue from the plant epidermis, and kills or inhibits pathogens and restores plant health through induction, diffusion or metabolites. Such as carbendazim, methyl tobuzin, chunleimycin, etc.
3. Eradicators can directly kill pathogens that have invaded plants. Such as sodium pentachlorophenol, fumei arsenic, stone sulfur mixture, etc.
4. The protective agent has the dual characteristics of the first agent and the protective agent, which can not only kill pathogenic bacteria and restore the health of crops, but also inhibit the germination of pathogenic spores and protect crops from damage.
Here are a few of the fungicides that have been used:
Chlorothalonil
It has a strong preventive effect on a variety of vegetable fungal diseases, while the first effect is small.
Prevention and control objects:Prevent a variety of fungal diseases, such as downy mildew, anthracnose, powdery mildew, blight, early blight, late blight, cotton blight, gray mold.
Precautions:It cannot be mixed with alkaline pesticides. Chlorothalonil is toxic to fish, and it is necessary to avoid polluting ponds and waters.
Mancozeb
Wide bactericidal spectrum. Prevention and protection are the main functions. Pathogens are not easily resistant and are safe for crops.
Prevention and control objects:Fungal diseases such as early blight, late blight, leaf mold, spot blight, downy mildew, anthracnose, vine blight, brown streak, cruciferous black spot, cabbage white spot, zucchini rhizopus rot.
Precautions:It should not be mixed with copper-containing or alkaline agentsThe recommended safety interval is 15 days.
Socrin
It has the dual role of protection and **.
Prevention and control objects:It is effective for a variety of crops such as rape, cucumber, grape, tomato and other gray mold and sclerotinia disease, but it is ineffective against oomycetes.
Precautions:It cannot be mixed with alkaline agents such as stone sulfur mixture, Bordeaux liquid and organophosphorus agents. It should be used alternately with agents with different mechanisms of action, such as pyrimethyl, promethoxytin, pyridoxamide, sclerotiospermia, etc.
Chunleimycin
It is a compound fungicide for protection and ** action.
Prevention and control objects:It has excellent control effect on fungal diseases such as leaf mold, anthracnose, powdery mildew, early blight, downy mildew and common diseases such as horn spot, soft rot and canker caused by bacteria.
Precautions:Some crops such as soybeans, peas, eggplants, and lotus roots are more sensitive to chunleimycin, and they must be kept away from these crops when using them to avoid pesticide damageGrapes, citrus, apples and other crops are also sensitive to chunleimycin produced by the small golden actinomycetes, so be sure to read the instructions carefully or consult agricultural technicians in detail when using.
Difenoconazole
*Systemic sterilization, with protective and ** effect.
Prevention and control objects:Almost all fungal diseases, such as: scab, powdery mildew, leaf spot, rust, anthracnose, etc.
Tebuconazole
High-efficiency, broad-spectrum, systemic fungicide has three major functions: protection and eradication.
Prevention and control objects:It can effectively prevent and control a variety of rust, powdery mildew, net spot, root rot and wheat mildew, and also has a good control effect on common peanut brown spot, brown wheel spot, grape gray mold, powdery mildew, banana leaf spot and tea cake disease.
Pyrimide
This product is a protective fungicide and should be applied at the beginning of the disease.
Prevention and control objects:Cruciferous plant root swelling disease and rice sudden disease caused by rhizopus also have a good control effect.
Precautions:It cannot be mixed with alkaline agents such as stone sulfur mixture, Bordeaux liquid and organophosphorus agents.