What happens to the wilted and spotted grape leaves?

Grape is a very delicious fruit, and the market is not low at all, which shows that growing grapes is still relatively promising. In the process of growing grapes, there are often some problems, such as the leaves turning yellow and drying up, what are the main reasons? What are the ways to prevent it?

Let's talk about it below!

1. Reasons why the leaves of grapes turn yellow and dry up:

1. There is a problem with the grape root system.

Because the yellowing of the leaves is definitely due to the inability of nutrients to reach the leaves, the priority is whether there is a problem with the grape root system, which may be caused by underground pests and diseases, or it may be caused by improper fertilization of the grape root necrosis, or the soil itself is sticky and not breathable.

2. The water volume is not evenly controlled.

Grapes themselves are drought-loving plants, if the water application experience is insufficient, a large amount of water will cause the root system to absorb too much water and the water content in the leaf surface is also beyond its own carrying capacity, if the drought is encountered later and the temperature and light and other unfavorable conditions are generated, it is easy to make the leaf surface injured and produce yellowing.

3. Lack of trace elements.

If the amount of nitrogen, phosphorus and potassium compound fertilizer is not strictly controlled, resulting in the inhibition between the elements, there will be a lack of trace elements such as calcium, magnesium, zinc, boron and other trace elements in grapes, resulting in the phenomenon of yellowing and even death of the leaves, so it is necessary to apply a large amount of mature organic fertilizer to quickly supplement various trace elements.

4. Pests and diseases.

To prevent the occurrence of gray mold black spot to fundamentally improve the immunity of grapes, it is necessary to supplement various organic fertilizers, in addition to potassium dihydrogen phosphate with some efficient insecticides and sprays, which can not only kill the bacteria but also improve the immunity of grapes.

2. Prevention and control methods for yellowing and drying up grape leaves

1. Good ventilation.

The main growing season of the grapes is in the summer, when temperatures are high. If the density of the grapes is too high, the temperature will be too high, and the temperature combined with poor ventilation will directly cause the leaves of the grapes to turn yellow or even die.

2. Ensure moisture**.

The grapes are very susceptible to waterlogging and slightly drought tolerant. If the leaves dry and then slowly wilt, this is most likely due to lack of water or waterlogging. Therefore, it is necessary to ensure the moisture of the grapes**, but also to ensure that the drainage of the grapes is convenient and timely.

3. Reasonable fertilization.

If your grape leaves are yellow and the veins are still green, with only yellowing between the veins, then this is an iron or magnesium deficiency. However, because there are many varieties of trace elements, it is impossible to distinguish them one by one, and it is recommended to apply compound fertilizer at this time.

4. Use carbendazim.

If you have yellow spots on your grape leaves, and the leaves die slowly, then your grape leaves have a fungal infection. We can use carbendazim, which can be controlled by spraying according to the instructions.

The appearance of leaf wilting and spotting is likely to be caused by malnutrition, so we should usually water it more and let it bask in the sun.

This is the most common downy mildew in grapes! Grape downy mildew generally occurs in the rainy season, generally in June-July-August, and is a typical bacterial infection, and has the characteristics of multi-year onset.

It is possible that there are pests and diseases in the plant, and the special insecticide for the plant should be used in time, evenly sprayed on the surface of the grape leaves, and it should not be watered during the medication, otherwise there is no effect, and it may be too much watering.

Causes of macular in grape leaves.

1. Soil discomfort: The yellow spots on its leaves are mostly due to infection with yellow leaf disease, which is usually caused by soil iron deficiency. The soil contains more calcium carbonate, which causes the soluble iron salt to become insoluble, and its roots cannot absorb normally, and the physiological state is unbalanced in the long run, which is prone to this disease.

2. Improper fertilization: It may also be caused by improper fertilization, the fertilizer applied is not decomposed, such as chicken manure, sheep manure, etc., which is also easy to be infected with yellow leaf disease.

3. Lack of water: During the growth period, it is inseparable from water, if the soil is dry for a long time, the root system can not absorb water, and can not provide water to the branches and leaves normally, it is easy to appear yellow leaves. This is especially true for new seedlings or plants with floating roots.

Prevention and control methods. This kind of disease should be prevented and controlled in advance. Before the fixed value, it is necessary to open a ditch for irrigation and wash the soil for alkali and salt drainage.

After fruiting every year, the decaying organic fertilizer should be applied, and it is recommended to do it after autumn and before burying the soil into winter. During the growth period, it is necessary to apply granular fertilizer regularly to ensure that its nutrients are sufficient and there is no shortage of nutrients. In addition, if you are found to be infected with yellow leaf disease, you should spray the drug as soon as possible, and the drug can be mixed with ferrous sulfate and citric acid.

Spray every 7-10 days. It is best to spray on a cloudy day, avoiding the scorching sun.

Hello, it is possible that it is caused by rotten roots of grapes.

If you find that most of the fibrous roots are brown and dead, the rough roots are uneven, the lesions are dark brown, the cortex is swollen and ulcerative, and the dark brown sap will overflow when pressed by hand, accompanied by a peculiar smell, then the vine is definitely rotten roots.

Grape rotten root solution:

1. The drainage conditions of low-lying orchards should be improved, and the flat orchards should be ditched and drained in and around the orchard to avoid the roots being soaked in water for a long time and suffocating and rotting.

2. Ditch and block to prevent the diseased roots from coming into contact with the healthy roots of the neighboring fruit trees, resulting in the spread of the disease.

3. Root cleaning and disinfection, if necessary, consider replacing the roots.

After completing these tasks, Kehai and Weihai can help improve the soil environment, promote root growth, and improve stress resistance.

1. The fat is too full-length vines and leaves, and it is not pruned. 2. Insufficient fertilizer, nutrition can not keep up. 3. Poor light and ventilation, easy to get sick, 4. Too much soil water.