Some of the grape leaves are rotten, some have yellow spots, what s the matter?

Grape yellow leaf disease is a disease, its symptoms, causes and comprehensive control measures:

First, the symptoms of the disease are usually in the grape growing in alkaline soil is prone to disease, from the early stage of the young seedling leaves begin to turn yellow-green or yellow-white, in severe cases, the leaves are scorched around, affecting the normal development of the tree, the berries stop growing and turn yellow, partially offset. > 2, the reason for the > is: > 1, the lack of iron in the soil, because the soil contains specific calcium carbonate in the soil soluble into insoluble ferric ions, resulting in the grape roots can not absorb the physiological equilibrium of the grape plants growing in saline-alkali land, and the transfer and use of iron is hindered.

In February and May, due to high temperatures, grape leaves and ears need a lot of nutrients to reproduce and grow, the water temperature is low, the ground temperature rises and after slowly watering, the soil is compacted and permeability is poor, so that the root respiration and nutrient absorption capacity is weakened.

Third, the onset of the disease is regular.

Vineyards in normal years, which occur to varying degrees in May each year, generally disappear after 710 days if prevented and ** in time.

Fourth, prevention and control methods.

1. A new vineyard planting ditch should be planted before irrigation and alkali drainage.

2. Grapes bear fruit every year when organic fertilizer is applied, and the best grapes are buried in autumn before the arrival of winter into decaying organic fertilizer.

3. During the grape growing season, it should be dressed and various trace elements, containing nitrogen, phosphorus and potassium compound fertilizer, and the soil will not lead to a certain nutrient deficiency.

4. Ferrous sulfate solution sprayed on the foliar surface of grapes at the early stage of the disease; TP type organic iron fertilizer (produced by Taiyuan phosphate fertilizer factory) or organic chelated iron fertilizer (developed by Hebei Changli Agricultural and Guang School), the effect is good.

Grape downy mildew or brown spot or gray spot, as for the solution, it's up to you.

Causes and solutions for yellowing and wilting of grape leaves = as follows:

1. Drought and water shortage.

1. Reason: If the grapes are not watered for a long time, the leaves will turn yellow after the plant lacks water.

2. Solution: It needs to be watered in time, if it is a potted vine, it is more likely to be short of water, and the general planting plants are deeply rooted and can find water from the soil.

2. Improper fertilization.

1. Reason: If you don't fertilize the vine for too long, you will have yellow leaves due to lack of nutrients, especially after the fruiting period, and a lot of nutrients will be consumed. If too much fertilizer is applied, the fertilizer will also lead to root rot.

2. Solution: If there is no fertilization for a long time, it can be fertilized in time, if it is caused by too much fertilizer damage, it is necessary to clean up the excess fertilizer in time, and water it more, which can reduce the concentration of fertilizer and avoid the impact of fertilizer damage. Usually in the fertilization of the need to pay attention to thin fertilizer diligent, the amount and concentration of each fertilizer should not be too high, do not use raw fertilizer.

3. Lack of light.

1. Reason: Grapevines like to grow in a sunny environment, if they can't receive light for too long, it will affect the formation of chlorophyll in the leaves, resulting in yellow leaves.

2. Solution: This situation generally occurs in potted planting, and it needs to be gradually transferred to a good location for maintenance, and it cannot be suddenly moved to the sun, and it is difficult for plants to adapt to too much environmental change.

Fourth, iron deficiency. 1. Reason: When the vine is deficient in iron, there will be yellow leaves, and the typical symptom of iron deficiency is that the leaf veins are light green, but the rest of the leaves are yellow.

2. Solution: You can put the rusty iron nails on the grape roots, and then water them to play the role of iron supplementation, or use ferrous sulfate for irrigation, and the iron supplement effect is also better.

Conservation of grapes.

In the summer, it is necessary to water in time to keep the soil moist, and also to sprinkle the leaves frequently.

In the first stage of grape growth, nitrogen fertilizer can be applied appropriately. In autumn, after the grape bonsai leaves fall, it is necessary to turn over the pot in time, out of the old soil of about 1 3, and prune the roots, remove the dead roots, and apply base fertilizer when changing the soil. For the pruning of the branches, it can be done after the leaves have fallen and before budding in the spring of the following year.

Grape planting, the reason for the yellowing of the leaves of grapes is explained, it is recommended to collect!

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, and the fertilizer applied is not well decomposed before the tomb, such as chicken manure, sheep manure, etc., which is also easy to be infected with yellow leaf disease, and should be especially careful when fertilizing, and raw fertilizer can not be used.

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.

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, compound fertilizer should be applied regularly to ensure that its nutrients are sufficient and there must be no lack 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.