What is the disease of necrosis and black water on the stem of the walnut tree

The essence of black water disease is a rot disease caused by frost damage, which mainly damages the cortex of the main trunk and main branches, and is often accompanied by the outflow of black fungus in the onset season. **Method: 1. Completely scrape off the lesions, which is simple and easy to do, and has the best effect.

2. Punch holes or cut wounds on the lesions from April to May, and then spray 50-100 times of methyl tobuzine or dessenamine, once every 10 days, a total of three times, and the control effect can reach more than 90%. 3. The use of tree trunk whitening has a good preventive effect on this disease.

1.Strengthen tree management. Enhancing tree vigor is the basic measure to prevent and control walnut black water disease.

Through deep soil ploughing, reasonable grass production, organic fertilizer application, timely top dressing, timely irrigation and drainage, closed garden thinning transformation, reasonable pruning, improve the nutrient level of the tree, enhance the tree potential, in order to increase the ability of walnut to resist cold, frost and pests. 2.Clean the garden and burn the diseased branches.

Prune diseased branches and dead branches, and at the same time do a good job of sanitation in the walnut orchard, remove the diseased branches and dead branches in the garden in time, and burn them outside the garden to reduce germs.

3.The trunk is painted white. After the leaves fall in autumn every year, the walnut trunk should be whitened, especially for the newly planted young trees, more attention should be paid to the trunk whitening to prevent the occurrence of frost damage of walnut trees and reduce the invasion of pathogens into the channel.

The whitening agent formula is: 10 kg of quicklime, 10 kg of salt, 1 kg of sulfur powder, and 50 kg of water.

4.Scrape old skin and lesions to disinfect and protect. In spring, the lesions should be completely scraped, and the scope of scraping should be about centimeters wider than the discolored necrotic tissue, and the scraping should be smooth and flat.

Spray 50 times the liquid of Ningnanmycin plus Bacillus subtilis on the scraping wound, and then apply dichlorrot for protection after the liquid is dry, and the effect is very good. Lesions found in summer can be scraped with scratch**. The scraped bark is burned in a concentrated manner.

5.Chemical control. Before the onset or at the beginning of the onset of the disease, the canopy spraying can be carried out with 80% tebuconazole 5000 times, or 20% polyol 2000 times, or 2% Ningnanmycin 1000 times, sprayed once every 7 days, sprayed 3 times, can achieve better control effect.

Summary: There are two reasons for the blackening of walnuts on trees: one is caused by the insect pest walnut lifting moth, which is usually sprayed in early June to prevent the occurrence of this pest.

It is also caused by the disease walnut black spot disease, which can be sprayed to prevent and control when the walnut leaves bloom.

Growing Environment:Born in the slopes and hilly areas of 400-1800 meters above sea level, it is commonly cultivated in the plains and hilly areas of China, prefers fertile and moist sandy loam, and is commonly found in places with deep soil layers on both sides of mountain valleys.

Appropriate fertilization:The amount of fertilizer needs to be combined with the growth of walnut trees and the objective problems of the soil, so as to determine the variety and quantity of fertilizer. The correct selection of fertilizer types plays a very important role in the growth of walnut trees, and the selection of appropriate fertilizer varieties plays a very important role in improving the quality and quantity of walnuts.

The occurrence of black walnut is mainly anthracnose, which is caused by fungal infection, mainly harms the fruit of walnut, but also harms the leaves, buds or tender shoots of walnut.

Walnut dry rot. Black water flows out from the decay of the cortex, and if you press it with your fingers, not only a foamy liquid will flow, but you can also smell the smell of sake lees.

In autumn and winter, it is necessary to scrape off the diseased spots in time, remove the seriously diseased branches, and burn them in a concentrated manner; For tree trunks with few lesions, you can scrape them off with a knife and apply medicine.

The trunk of the tree with many lesions can be drawn a few horizontal and vertical lines at the lesions, and sprayed, and the agent can be used 80% 402 antibacterial agent 200 times or 80% allicin 200 times; If the disease is severe, it should be sprayed 3 times in a row, once every 5 days.

During the onset period of April and October, spray and disinfect the diseased hickory trees and ground to kill the germs. Use less chemical fertilizer, apply more organic fertilizer and biological fertilizer, improve the resistance of trees themselves, and it is best to breed disease-resistant varieties when planting.

The blackening of walnuts on the tree can be caused by the following reasons:1Pest and Disease Infections:

The blackening of walnuts on the tree may be caused by pest and disease infections. For example, pests and diseases such as walnut black spot and walnut aphid can cause black spots on the surface of walnuts or the entire walnut to turn black. If it is caused by pests and diseases, corresponding control measures can be taken, such as applying pesticides or strengthening management, to prevent the spread and invasion of pests and diseases.

2.Insufficient or excessive water: The blackening of walnuts on the tree can also be caused by insufficient or excessive moisture.

If the walnut tree is dehydrated for a long time or is in an excessively humid environment, the bush will affect the normal growth and development of walnuts, causing walnuts to turn black. Therefore, it is necessary to water properly to ensure the moisture of the walnut tree**. 3.

High Temperatures: Hot weather can also cause walnuts to turn black on the tree. In a hot and hot environment, the skin of walnuts will dry out and be prone to cracks, which will affect the quality and quality of walnuts.

Therefore, it is necessary to reasonably manage and regulate the ambient temperature to ensure the normal growth and development of walnuts. In conclusion, the blackening of walnuts on the tree can be caused by a variety of reasons, and careful investigation and adjustment are required to find the final solution.

Hello, young trees, if it is not serious, you can directly use the high-concentration solution of "Wuningmycin" to paint it; If the bark of the old tree is thicker than the liquid, you can first scrape off the old bark (be careful not to scrape the xylem), and then cut it longitudinally to the xylem every 1-2 cm longitudinally, brush with peracetic acid, and after the basic healing, Wuningmycin is sprayed. The scraped sawdust should be cleared out of the garden and burned for annihilation. In addition, it is necessary to pay attention to enhancing the tree potential, increasing phosphorus, potassium, calcium and magnesium, etc., and humidity to control nitrogen fertilizer**; In the process of daily management, the spraying fungicide should also be sprayed on the branches, stems and roots to prevent the invasion of diseases.

China is one of the world's largest walnut producers, with the largest planting area and output, and the second largest export volume in the world.

Walnuts on the tree will be black and bad, may be caused by the insect pest walnut limb moth, or it may be caused by walnut black spot disease, this situation can be sprayed when the walnut leaves bloom. Walnut is a plant of the genus Juglans in the family Juglans.

Walnut kernels contain more protein and essential unsaturated fatty acids, and the nutritional value is very high.

Walnuts, along with almonds, cashews, and hazelnuts, are known as the world's famous "four dried fruits". The shell of the walnut is hard and needs to be broken open to eat.

Zhongzheng Rolling Country is one of the world's walnut origin centers, the world's largest walnut production country, with the largest planting area and output, and the export volume is second only to the United States, ranking second in the world.