How to cure the walnuts of the walnut tree are black

Generally, fungicides can be used with fungicides such as chlorobromoisocyanuric acid or octamine acetate, which can effectively control a variety of diseases.

In the second half of the month, the tree body was sprayed with half-dose Bordeaux liquid, prochlorazine, azoxystrobin, difenoconazole, flusiliconazole, propiconazole, chlorbromoisocyanuric acid and other agents. Prevention and control of walnut anthracnose, walnut black spot and other diseases.

In the middle of the month, when the wheat is harvested, 25% chlorpyramide No. 3, pyrethrin, mixed imidacloprid and thiamethoxam are used. Add methyl tobuzin or above fungicide. Spray again once every 10 days or so to prevent and control stinging moths, walnut limb moths, walnut anthracnose and walnut black spot disease.

In the middle of the month, methyl tobuzin, colede, chlorobromoisocyanuric acid, octylamine acetate. Mix pyrethroids and other insecticides. Spray once every 10 days to prevent and control walnut anthracnose, walnut black spot, stinging moth, etc.

It also treats other diseases and insect pests.

Spraying treatment: Remove the damaged fruit and use a special fungicide to treat the walnut tree. Clearing the orchard:

Remove all the dead branches and weeds in the walnut orchard. Drain stagnant water: Drain the plants to mitigate the damage caused by waterlogging.

Update pruning: Remove dense, thin, cross, and overlapping branches from the inside.

1. Spraying treatment

The blackening of the fruit of walnut tree is generally caused by pest and disease infection, such as black spot, anthracnose, etc., which will lead to the phenomenon of stunted development of walnut fruit, at this time, it is necessary to remove the damaged fruit in time, and then use a special fungicide to spray the plant, which has the effect of preventing and controlling diseases.

2. Clean up the orchard

When the fruit of the walnut tree is black, it is necessary to clear the orchard during the winter, remove all the dead branches and weeds in the walnut orchard, and properly plough the orchard once, and the depth of more than 15 cm is the most suitable to eliminate the overwintering insect eggs.

3. Drain stagnant water

The fruit of the walnut tree is easy to cause blackening due to the accumulation of water in the rainy season every year, so in the rainy season every year, it is necessary to drain the water for the plant in time to reduce the harm caused by waterlogging, and when maintaining the walnut tree, it is necessary to pay attention to strengthening the management of water and fertilizer to improve the disease resistance of the tree.

4. Update pruning

The strength of the walnut tree itself is one of the factors for the occurrence of walnut black fruit disease, which can be alleviated by renewing and pruning branches and leaves, and timely pruning the dense branches, weak branches, cross branches and overlapping branches inside, and retaining strong branches as fruiting branches to enhance the disease resistance of the plant.

Walnut Black Spot Symptoms Walnut black spot is also known as black rot. It is mainly harmful to young fruits and leaves, and can also be harmful to young branches. The young fruit is infected, and the fruit surface has small brown spots, the edge is not obvious, and then it turns black and deep to the pulp, causing the whole walnut and kernel to turn black or rot and fall off.

After the near-ripe fruit is infected, it is first confined to the exocarp, and then spreads to the mesocarp, causing the diseased part of the peel to fall off, the endocarp is exposed, and the kernel is intact. Leaf infection, first on the leaf veins appear nearly round or polygonal small brown spots, expand and heal with each other, the periphery of the lesion is water-stained halo, a few perforations in the later stage, the diseased leaves shrink and deform.

Pathogenesis ]: Pathogenic bacteria overwinter in branches or buds. In the following spring, the bacterial fluid is transmitted by wind and rain, and invades from stomata, skin pores, nectar glands and wounds, causing infection of leaves, fruits or shoots.

Under 4 30 conditions, the host epidermis is moist and pathogens can invade leaves or fruits. The incubation period is 5 to 34 days, and in the field it is mostly 10 to 15 days. Walnut flower stage and susceptible to disease, rainy summer disease is serious.

Wounds caused by walnut limb moths are susceptible to infection by the fungus.

Control methods] :(1) timely control of walnut pests. (2) Spraying 4000 times of Bordeaux solution or 72% agricultural streptomycin soluble powder and 400,000 units of penicillin potassium salt are also effective for diluting water into 5000 times when walnut leaves are spreading and after flowering.

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.

Summary. Generally, the black fruit phenomenon on the green skin of walnuts is mainly caused by two reasons, one is caused by disease, and the other is harmed by limb moths. After being found, the diseased fruit should be removed in time and destroyed in time to reduce the source of diseases and insects.

Generally, the black fruit phenomenon on the green skin of walnuts is mainly caused by two reasons, one is caused by disease, and the other is caused by the limb moth. After discovery, the diseased fruit should be removed in time and Liang Min should be destroyed in time to reduce the source of diseases and insects.

It's still black and rotten, dear.

If it's dark, it may be meladerma.

If it is rotten, it is a rot disease.

Prevention and control technology of walnut rot disease (1) Strengthening tree management and enhancing tree potential are the fundamental measures for the prevention and control of 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 trees to resist cold, frost and pests. (2) Prune diseased branches and dead branches, do a good job of sanitation in the walnut orchard, and promptly clear the diseased branches and dead branches in the garden and burn them outside the garden to reduce pathogens.

3) The trunk is painted white. After the leaves fall in autumn every year, the trunk of walnut trees should be whitened, especially for newly planted young trees, more attention should be paid to whitening the trunk to prevent the occurrence of frost damage of walnut trees and reduce the invasion of germs and birds. The whitening agent formula is 10 kg of quicklime.

Kilograms of salt, kilograms of sulfur powder, 50 kilograms of water. (4) Scrape old skin and lesion disinfection protection. 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 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. It is okay to find lesions in the summer.

When walnut peach is infected with melanoderma during the germination period, it needs to be sprayed with a baume stone sulfur mixture, after the plant spreads its leaves and before flowering, it is sprayed with veterinary streptomycin 3000 times again, and after walnut fruit setting, spray Bordeaux liquid once every 15 days, and after each or silver year of defoliation, it is necessary to apply tree general agent on the trunk and branches of walnut trees to prevent the reproduction of pathogens.

The blackening of the leaves is mainly caused by these three reasons.

The first reason is that plants are infected with diseases, such as anthracnose, brown spot, black spot, etc., which will cause black spots on the leaf surface, and in severe cases, cause leaves to fall.

The second reason is that too much water and fertilizer is applied, so that the plant rotten roots cause black leaves, the plant needs to be depotted as soon as possible, the rotten roots are pruned off, and the disinfection and sterilization treatment is done.

The third reason is that the leaves are frostbitten at low temperatures. In addition to this, there are also reasons such as too much light, poor ventilation, soil alkalization, etc.

The walnut leaves are black, it may be bitten by insects, you can check whether there are small insects growing on the walnut roots, and then judge whether the leaves are black, whether it is caused by insect bites.

The blackening of walnut leaves may be caused by a period of drought or pests and diseases.

Walnut fruit blackening want to prevent and control, you need to use drugs to spray in time at the beginning of the disease, in the rainy season, to drain the walnut plants in time, overwintering, you need to remove the dead branches and weeds in the walnut orchard, and the soil should be regularly sprayed in places with serious pests and diseases, so as to reduce the probability of walnut fruit blackening.

If you want to prevent walnuts from turning black, then I don't think this is possible. Let him be hunted in the sun, so that it should be possible, and it can be kept in a low temperature environment, which should prevent it from turning black.

To prevent walnuts from darkening, you can apply a layer of oil wax to the surface of the walnuts, or put some other layers or something.

To prevent walnuts from turning black, they should be sealed and stored. Try not to come into contact with hot, humid air. Then you want to prevent insect infestations.

Refrigerate or take it out to dry it so that the walnuts don't get wet.

When the walnuts turn black, you just dry the walnuts and store them in a confined space for as long as possible, and don't let them be put in a humid environment, it should be okay, right?

If this ** black walnut turns black, to prevent the walnut from turning black, you will dry the walnut and store it in a clean and sealed environment, and then it should be okay in an environment, right?

Summary. Walnuts will turn black, which is what many farmers will encounter when it is ripe, under normal circumstances, this blackening is not normal, not the kind of black when we peel off, but caused by some special reasons, generally speaking, there are the following, sunburn, disease, insect pest and late picking, each situation will cause walnuts to turn black, we need to treat them differently. Sunburn.

In strong sunny weather, dry air, sunshine causes walnuts to be sent most frequently, this is because the light is too strong, the moisture of the walnut skin is dried, just like scalding with boiling water, and after a long time, the walnut skin begins to blacken, and the walnut kernels inside naturally turn black, which is inedible.

Why do walnut trees turn black.

Walnuts will turn black, which is what many farmers will encounter when it is ripe, under normal circumstances, this blackening is not normal, not the kind of black when we peel off, but caused by some special reasons, generally speaking, there are the following, sunburn, disease, insect pest and late picking, each situation will cause walnuts to turn black, we need to treat them differently. Sunburn. In strong sunny weather, dry air, sunshine causes walnuts to be sent most frequently, this is because the light is too strong, the moisture of the walnut skin is dried, just like scalding with boiling water, and after a long time, the walnut skin begins to blacken, and the walnut kernels inside naturally turn black, which is inedible.

There are two reasons for the black color of walnuts on the tree: one is caused by the insect pest walnut limb 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, which can be sprayed when the walnut leaves bloom.

The peel of walnut tree fruit is black and drops in the later stage, which can be controlled from the following aspects:

1. Weather reasons:

Walnuts (especially during the fruit-bearing period) prefer a dry, sunny environment, and even cloudy weather, excessive water accumulation, and lack of sunlight will cause fruit drop.

Before the rainy season arrives, it is necessary to do a good job of drainage to avoid excessive water accumulation and fruit rot and fruit loss; If necessary, fruit thinning is also required.

2. Physiological fruit drop:

It is mainly caused by uneven pollination, large water, large fertilizer, etc.; Artificial pollination should be applied when the walnut tree is in bloom, and fertilization and watering should be done properly during the fruiting period. Fertilization can be done with soil chef effect fertilizer, which has a good effect on the prevention of physiological fruit drop.

3. Fungal infection:

walnut black spot and anthracnose, fruit drop is easy to occur; The main manifestation is that the fruit turns black, and it is necessary to apply soil chef effect fertilizer to protect it in advance.

4. Pests and diseases:

It is best to give priority to prevention, and it is best to apply insecticides and fungicides at the same time at the young fruit stage or the end of flowering stage to prevent heartworms, anthracnose and other diseases.

Insecticides can be cypermethrin or avermectin with high efficiency and low toxicity; Fungicides can be used for spectral sterilization such as difenoconazole, which can be injected twice.

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.