What s the matter with the walnut sapling s leaves that are always yellowing and drying?

There are several reasons why walnut leaves are yellowing and leaves are dry:

1. The retraction is too heavy. The peach tree retracts during the growth period, and the tree loses a large number of nutrient-producing leaves, resulting in the weakening of the respiration, photosynthesis, and transpiration of the tree itself, and the lack of nutrients.

2. Iron deficiency. The color of the leaves is mainly the color of chlorophyll, the synthesis of chlorophyll must have iron, if there is a lack of iron, the leaves will be yellowed, you can apply the water-soluble fertilizer of trace elements in the sea and Weihai to supplement the nutrients required by walnut trees and alleviate the yellowing of leaves.

3. Soil. Due to long-term watering or because of rainwater accumulation, the soil permeability of walnut orchards will deteriorate, which will affect root absorption, and will also cause the leaves to turn yellow, which can be adjusted by applying biological fungi.

4. High density and insufficient light. When the canopy density of walnut trees is too large, due to poor ventilation caused by canopy closure, it will also cause walnut trees to turn yellow, dry up, and lose leaves for a long time.

The solution to the blackened and dry leaves of the walnut tree.

The blackened and dry leaves of the walnut tree may be caused by a lack of iron. After the walnut tree is deficient in iron, the leaves will turn from green to yellow, and the walnut tree can not carry out photosynthesis normally.

If the walnut tree grows in the compacted soil for a long time, it will hinder the respiration of the root system, and the rhizome can not provide nutrients and water to the branches and leaves normally, so that the leaves appear yellow and dry.

The density of walnut trees is too large, which can easily lead to insufficient light, poor ventilation between branches and leaves, and the leaves will appear black when grown in a shady environment for a long time. Therefore, when cultivating walnut trees, it is necessary to do a good job of pruning, and in autumn every year, it is necessary to thin the branches and leaves that grow too densely in time to increase the light transmittance between the canopies.

The blackened leaves of walnut trees may also be caused by infection, after the walnut tree is attacked by aphids, the leaves will appear black and dry, at this time, it is necessary to prune off the blackened leaves, and spray the walnut tree with oxidized fruit solution**, until the walnut tree recovers health.

Summary. Hello, walnut tree leaves yellow, roots black dead tree roots are an important place for trees to absorb nutrients The roots of the tree are black and rotten, which means that the nutrients are not absorbed, resulting in the death of the tree.

The leaves of the walnut tree turn yellow, and the roots of the tree are black and die.

Hello, walnut tree leaves yellow, roots black dead tree roots are an important place for trees to absorb nutrients The roots of the tree are black and rotten, which means that the nutrients are not absorbed, resulting in the death of the tree.

Root black is a toxic substance that has an effect on the root system. For example, the dead roots after a large number of root deaths due to excessive pruning, rotting and decomposing in the ten soils will produce toxic substances, poisoning young roots and new roots, thereby reducing the ability of the root system to absorb nutrients, resulting in dystrophic and yellow leaves on the tree.

Root disease damage, individual peach trees have root cancer, root knot line and other root disease damage, weakening the tree strength, reducing the root system's ability to absorb nutrients, resulting in insufficient nutrients and yellow leaves.

When the disease is severe, spray with 1/1000 ferrous sulfate solution plus 3% urea, or irrigate the roots with 1/1000 ferrous sulfate solution in the dense root area.

It is caused by walnut black spot disease. It mainly harms walnut fruits, leaves, shoots, buds, and male inflorescences. Generally, the plant damage rate is 70 100, the fruit damage rate is 10 40, and the serious case can reach more than 95, causing the fruit to turn black, rot and fall early.

Symptoms: Mainly damage walnut young leaves, shoots, flowers and fruits. When the leaves are damaged, there are small black spots that are nearly round or polygonal, and then expand and spread to the whole leaf, and in severe cases, they can be connected to each other to form large spots, so that the leaves fall early.

The shoots and petioles are damaged, and the lesions are oblong or narrow, brown, slightly concave, and when the lesions circle around the branches, they cause dead branches. The inflorescence is damaged, first produces black water-stained lesions, no, then the flower axis becomes black, curved, and even falls early. The fruit is damaged, and black spots appear at the beginning.

It is water-stained, and the lesions expand rapidly in the future, causing all the peels to turn black, and the young fruits can invade the kernels, which can make the kernels and shells turn black, causing early fruit drop, and the lesions of the old fruits are limited to the exocarp. Prevention and control methods: combined with pruning in winter, eliminate diseased fruits, diseased branches and diseased leaves, and concentrate on burning, spray 2 Baumé stone sulfur mixture once before germination; Spray once before the female flowers bloom, once after flowering, and once at the young fruit stage

200 Bordeaux liquid, or copper sulfate, or 500 800 times antibacterial, or 30 times sterilized king.

When walnut trees have yellow leaves, they weaken and the entire tree dies. It is generally caused by physiological diseases, excessive watering or improper fertilization of the slag starter. When the leaves of walnut trees are yellow, more trace elements containing iron should be applied, watering should be appropriately reduced, water accumulation should be avoided, pruning should be done well, and ventilation should be increased.

If the root rot is found, the roots should be plucked and dried as soon as possible, and the roots should be irrigated with medicine.

What's going on with the yellowing of the leaves of the walnut tree.

When walnut trees have yellow leaves, they weaken and the entire tree dies. It is usually caused by damage such as physiological diseases, overwatering or improper fertilization by beam sellers.

Common cause of yellowing of walnut leaves.

1. Lack of iron: The yellowing of the leaves of the walnut tree is likely to be due to a lack of iron, and the leaves gradually change when iron is deficient, and the leaves will turn from green to yellow.

2. Soil compaction: Walnut tree soil compaction will hinder respiration, the root system will not be able to provide water and nutrients normally, and the leaves will turn yellow and fall defoliate.

3. Lack of light: The density of walnut tree cultivation is too large, which can easily lead to insufficient light and poor ventilation. This will cause the leaves to turn yellow over time.

4. Infection with pests and diseases: The yellowing of the leaves of the walnut tree may be infected with pests and diseases, and once infected, the overall growth will be affected, causing the leaves to turn yellow and wilt.

How to treat the yellowing of walnut leaves.

When the leaves of walnut trees are yellow, more trace elements containing iron should be applied, watering should be appropriately reduced, water accumulation should be avoided, pruning should be done well, and ventilation should be increased. If the root rot is found, the roots should be plucked and dried as soon as possible, and the roots should be irrigated with medicine.

Prevents yellowing of walnut leaves.

When walnut seedlings are out of the nursery, the diseased seedlings should be checked, and the roots of the suspected ones should be soaked in methyl tobuzin for 10 minutes and then planted. When the walnut tree is weakened, the soil around the roots should be examined, and if the mycelium is found, the lesions should be scraped off with a sharp knife, and then the wound should be disinfected with antibiotics.

Causes of walnut defoliation and prevention and control schemes

First, the reason why walnuts fall off leaves

Walnut tree defoliation is a common phenomenon, causing a variety of reasons such as pests and diseases, water and fertilizer, light, temperature, etc. In general, the root cause should be found. If the leaves fall after the rain, it is mostly caused by burning the roots and improper fertilization methods.

In addition, there are other reasons for the height of the cavity, such as: too strong light, too strong direct light in summer, which will not only cause the leaves to lose color, but also cause leaf fall; Walnuts avoid drought and need a lot of water. If there is not enough water for the reunion, the plant will lose its leaves due to lack of water. When pests and diseases occur, it is necessary to prescribe the right medicine.

Second, the prevention and control of walnut defoliation

1. Proper planting.

Walnut prefers warm and humid environmental conditions, and is suitable for planting in areas with an average annual temperature of 9 to 16, an extreme minimum temperature of more than minus 25, a frost-free period of more than 150 days, and a normal temperature and no cold. The annual precipitation is more than 700 mm.

2. Scientific fertilization.

Choose the right time when applying fertilizer. Generally, it is necessary to top dressing in early spring or late autumn. Depending on the period, the amount of fertilizer applied should be controlled.

If the young trees reach the full fruiting stage, the amount of manure used by farmers should be increased from 15,000 to 22,500 kg hectares to 30,000 to 45,000 kg hectares.

3.Pest control.

Avermectin + bifenthrin or pyridafen can be used. Add difenoconazole, chlorobromoisocyanuric acid, ocepandil acetate and other fungicides** black spot and other diseases. It can be sprayed twice a week, and it can be used for black spot disease after rain, and it is treated according to spider damage.

4.Control temperature and humidity.

For extreme weather, it is necessary to take precautions in time. Due to the characteristics of walnut root system, it should be drained in time during the rainy season. It is advisable to fix the drainage facilities in the park in advance.

The following measures can be taken to prevent frost damage before germination in winter, such as increasing organic fertilizer, irrigation before winter, whitening the tree, and binding the tree. Emergency measures should be taken in the event of a sudden change in the weather.

Lack of nutrients, lack of iron will cause walnut trees to yellow leaves, can be buried in the soil an iron nail to alleviate; Insufficient light, too dense growth of branches and leaves will make walnut trees yellow and fall, it is necessary to thin the dense growth of branches and leaves to improve the light transmittance between branches and leaves; When the disease is attacked, prune off the severely infected leaves and spray dimethoate emulsion**.

The yellowing and shedding of walnut leaves may be caused by a lack of iron, and the leaves will turn from green to yellow after iron deficiency, and the plant will not be able to photosynthesize normally, so it will appear yellow and fall off. In this case, the walnut tree needs to be fertilized with iron-rich microorganisms or a rusty nail is buried directly in the soil.

If the density of walnut trees is too large, it is easy to cause insufficient light, the ventilation between the leaves will be poor, and the leaves will turn yellow when grown in a shady environment for a long time. In the later maintenance of walnut trees, it is necessary to thin the branches and leaves that grow too densely on the walnut trees in autumn every year to increase the ventilation and light transmittance between the branches and leaves.

Walnut leaves yellowing and falling off may also be caused by disease invasion, walnut leaves infected with aphids, the leaves will appear yellow and dry, at this time it is necessary to prune off the seriously infected leaves, and spray dimethoate emulsion on the leaves of walnut trees, so that walnut trees can resume growth as soon as possible.

Walnut trees are suitable for growing in loose and breathable soil, if the soil is seriously compacted, it will seriously hinder the respiration of the root system, and the rhizome can not give loose nutrients and water to the branches and leaves, which will make the leaves appear yellow. It is necessary to loosen the soil in time and add an appropriate amount of sediment to the soil to improve the air permeability of the soil.