The use of fungicides to control fruit tree diseases is simple and easy. Currently, the fruit tree fungicides commonly used in the market include imazalil, flusilazole, and carbendazim. Let's follow the Xiaobian together.
Imazalil
It is an imidazole systemic fungicide. The mechanism of action of this drug is to affect the permeability, physiological function and fat anabolism of cell membrane, thereby destroying the cell membrane of mold and inhibiting the formation of spores.
Fluorosilazole
Fluorosilazole is a triazole fungicide and is widely used to control black spot disease, powdery mildew, leaf spot, rust, anthracnose, black spot, black pox, and blight of various fruit trees and vegetables. , spot blight, brown spot disease and other diseases. Silazol and prochloraz are new fungicides with fluorine-containing atoms, higher bactericidal activity, unique mechanism of action, and less resistance. With systemic absorption, protection, treatment, eradication.
Malignant
The systemic fungicidal fungicide has a good preventive effect on the stagnation caused by rot and Fusarium.
Stone sulphur mixture
Lime sulphur is an inorganic sulfur preparation that can both sterilize and kill insects and kill mites. It can prevent powdery mildew, rust, brown rot, brown spot, black spot and red spider, scale insect And many other pests and diseases. Protection, prevention and treatment of diseases, moderate toxicity to humans and animals.
Mancozeb bactericide
The organic sulfur bactericide has a mechanism of action to inhibit the oxidation of pyruvate in the bacteria, thereby delaying the generation of resistance to the bacteria. The sterilization range is wide, generally no drug resistance occurs, mainly to control the infection of pathogens, to control rust on fruit trees, early defoliation, anthracnose and so on.
Chlorothalonil
Efficient, broad-spectrum fungicide with protection. It is mainly used for the prevention and control of rust, anthracnose, powdery mildew and downy mildew on fruit trees and vegetables.
Carbendazim
Benzimidazole fungicides are effective against ascomycetes and deuteromycetes, and have systemic conduction, protection and therapeutic effects. Its main mechanism of action is to interfere with the formation of spindles in mitosis of fungi, thereby affecting cell division.
How to use fruit tree fungicide:
1. Plant surface application The application of the agent on the surface of the plant is called surface application of the plant. There are five common methods: spray, dusting, dry coating, rooting, and foaming.
2. Chemical treatment The seedling method uses seeds to treat seeds, seedlings, scions, cuttings and other propagation materials to eliminate the pathological or internal pathogens of these materials, and to ensure that the material is not brought into dangerous diseases.
3. Soil chemical treatment The application of fungicides or nematicides to eliminate plant pathogens or pathogenic nematodes in soil is one of the important measures for chemical protection. This method is mostly used to control diseases of roots of fruit trees or vascular bundle diseases and nematodes caused by soil.
Precautions for using fruit tree fungicides:
Select the spraying time
Spraying time is not only a waste, but also reduces the control effect. When using the fungicide, it should be used according to the law of the occurrence of different diseases of the crop and the specific conditions of the disease. Generally, the time of use of the fungicide should be in the pre-onset or early onset.
Cautious drug mix
Many fungicides are alkaline pesticides , so they cannot be mixed with insecticides that are easily decomposed and decomposed by alkaline substances. Such as Bordeaux mixture, stone sulfur mixture and other alkaline, can not be mixed with dimethoate, 1605, dichlorvos and so on. This completely causes the loss of physiological activity or insecticidal ability of the insecticidal microorganisms.
Scientific use of pesticides
The spraying frequency of the bactericide is mainly determined according to the length of the residual period of the drug and the meteorological conditions. Generally, spray once every 10-15 days, spray a total of 2-3 times. If it is rainy after application, it should be sprayed in time. When spraying, the fog is required to be fine and uniform, so as to avoid leaking.
Beware of phytotoxicity
In general, seedlings and booting stages are prone to phytotoxicity. In addition, it is more likely to cause crop phytotoxicity under the conditions of high temperature and drought, strong sunshine or fog, high humidity and the like.
In addition, the use of fruit tree fungicides, it is necessary to prevent phytotoxicity problems, such as seedlings and booting flowering stages are prone to phytotoxicity, during which it is best to use fungicides with caution, in order to obtain more knowledge of pesticides, please pay attention to China's pesticide network
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