Peach is a common fruit in China. It is not only sweet and delicious, but also rich in nutrients. Powdery mildew is a very painful disease during the growth of peach trees. Let's talk about the prevention and control of peach powdery mildew.
Powdery mildew distribution and harm
Powdery mildew is a very common disease found in various regions of the North and South. Seedlings and trees of many species such as poplar, willow, algae, nuclear, dong, mining, walnut, sorghum, mulberry, pupa, nuclear, scorpion, rubber, apple, pear, peach, rose, clove, etc. Nie dye. However, white platinum disease only invades the tree species when the broad-time tree is not damaged. Generally, the effect on seedlings is not great, but when some powdery mildews occur seriously, the leaves of the seedlings may be early, dry, and even dead, or seriously affecting growth. Powdery mildew has been more common in Jiangsu, Zhejiang, Hubei, Henan, Shandong, Guizhou, Sichuan and other places in recent years, and it is becoming more and more serious. Caused by wheat powdery mildew. Common powdery mildew problems include: wheat powdery mildew, strawberry powdery mildew, grape powdery mildew, cucumber powdery mildew, peach powdery mildew.
Peach tree powdery mildew symptoms
The disease is mainly harmful, affecting photosynthesis and weakening the tree. Seedlings are more serious than adult trees. At the beginning of the disease, white small pink spots appear on the back of the leaves. After expansion, they are nearly round or irregularly shaped powder spots. The white powder spots combine to form large pink spots, which are covered with most or whole leaves. When the disease is heavy, the leaves also have white powder spots on the front. At the end of the disease, the leaves are chlorotic and shrink.
Peach tree powdery mildew disease conditions
The disease is a fungal disease, and the pathogenic bacteria are Trichoderma sinensis and Puccinia solani. The pathogens are overwintered with ascospores or hyphae, and in the second year of spring, the ascospore shells are released as a source of initial infection.
Peach tree powdery mildew pollution-free prevention
1. The best way to prevent and combat powdery mildew is to choose resistant plant varieties, especially those that are prone to powdery mildew. Before planting, it is best to first study whether there are varieties resistant to powdery mildew.
2. To avoid excessive fertilization, because fertilizer promotes soft stems, which is conducive to the development of powdery mildew.
3. The shaded areas are relatively moist, and the germs are easy to breed, so don't plant plants that are susceptible to powdery mildew. For the same reason, plants susceptible to powdery mildew should not be over-sprayed, and water should be given to the roots to avoid wetting the stems and leaves.
4. Thoroughly cleaning the garden can prevent or alleviate problems in the coming year. For example, powdery mildew occurs in cucumbers and pumpkins. After the harvest at the end of the season, the melons should be removed immediately. Do not wait for the frost to come. The remaining leaves of these infected vines should be bagged and discarded, and should not be used for composting.
What pesticides are used in peach tree powdery mildew?
To prevent and control powdery mildew, the use of Nanjing Dr. Pesticide fungicide Eptomycin, acetaminophen, and flusilazole prochloraz is effective in controlling powdery mildew.
Epoxystrobin: It can control most diseases such as Ascomycetes, Basidiomycetes, Deuteromycetes, and Oomycetes. It has a strong inhibitory effect on spore germination and growth of intracellular mycelia, and has protective, therapeutic and eradicative activities. It has good permeability and local systemic activity, and has a long-lasting effect. It is widely used to control diseases on crops such as fruit trees, vegetables, tea trees, and tobacco. In addition, this product can produce positive physiological regulation of crops, it can inhibit the production of ethylene, help crops have a longer time to reserve bio-energy to ensure maturity; can significantly increase the activity of crop nitrification reductase, when the crop is infected by virus At the time of the attack, pyraclostrobin accelerates the formation of proteins in the virus.
Acetyl phenol: It has a strong killing effect on mycelium, conidia, fertilized silk, etc., and can strongly inhibit the formation of spores, block the source of spore reinfection, and the bactericidal effect is comprehensive and thorough. For crops that have already developed disease, ethylpyrrolol can play a very good therapeutic role, can eliminate pathogens that have invaded plants, and can significantly inhibit the spread of pathogens. The pesticide bactericide has no cross-resistance. After the use of difenoconazole, the plants in the middle and late growth stages are dwarfed. Fluorosilazole caused dwarfing of plants and a significant increase in the number of deformed fruits in the field. 25% acetaminophen had no adverse effects on strawberry growth, and the plants grew normally after application.
Fluorosilazole prochloraz is a systemic triazole pesticide fungicide. After being sprayed on the foliage of plants, it can be quickly absorbed by the foliage and transmitted to plants to inhibit the biosynthesis of ergosterol, thus hindering the hyphae. Growth, development, and thus achieve the effect of disease prevention and treatment. Prochloraz is an imidazole pesticide fungicide with multiple functions such as prevention and protection of systemic conduction. This product is a soluble liquid agent compounded by the two, which can effectively control powdery mildew, rust, leaf spot, spotted leaf disease, anthracnose, sclerotinia, brown spot disease and mildew disease on crops.
Whether it is powdery mildew or some other common plant diseases and insect pests, we must adhere to the principle of prevention and prevention combined with prevention and control in plant pest control, so as to avoid the occurrence and expansion of the disease and minimize the plant's The degree of damage.
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