Why do grape leaves turn yellow

The grapes are very popular in the plots. As a rule, wines, juices, and various drinks are made from it. And also it is dried to obtain raisins. Gardeners often use it for conservation. The grapes require careful maintenance. Therefore, it is quite difficult for novice gardeners to tinker with this plant. Sometimes gardeners panic if, for some unknown reason, the leaves of the grapes turn yellow. Experts decided to help beginners and tell about the reasons why the leaves turn yellow.

Grape leaves turn yellow: reasons

There are several reasons why grape leaves can turn yellow.

1. Not enough potassium and nitrogen.
2. Lack of moisture in dry weather.
3. Excess fertilizer.
4. The action of pests on the foliage of grapes.
5. Lack or excess of sun.
6. Infectious diseases.
7. Fungal diseases.

Novice gardeners are advised to closely monitor the feeding of the grapes. Because it has a sufficient effect on the plant. If fertilizers are incorrectly applied to the soil, then the formation of fruits will slow down. Which will greatly affect the quality and quantity of fruits. Carefully monitor the application of organic fertilizers. Namely: bird droppings, as well as manure. Because they can cause chlorosis.

Symptoms for which you can find out the cause

1. With a shortage of nitrogenous fertilizers, you should focus on the following symptoms. Yields begin to decline. Stains are formed that are very similar to burns. Growth slows down or stops altogether. And also the leaves become small.
2. With a lack of potassium, the leaves turn yellow only at the edges. The range of yellowing increases every day. If there is enough potassium and nitrogen in the soil, the grapes develop well. Grows quickly, the fruits ripen a little ahead of time. The harvest becomes tasty and sweet. And also the plant survives the winter well without complications.
3. Lack of micronutrients such as magnesium and iron also cause the leaves to turn yellow.
4. If the grapes are not properly watered, especially in dry weather, the plant begins to wilt. His immunity is weakened. And also the leaves turn yellow, starting from the middle. Root system during such a period, he is experiencing tremendous stress. Therefore, after a certain period of time, it begins to weaken and dry out. Thus, the plant dies. Therefore, you need to monitor watering. And in no case do not overfill. Because excess moisture helps the development of fungal diseases.
5. Leaves may turn yellow due to the wrong planting site. It depends on the variety. Because some varieties like shaded areas. And some bright places. The wrong place will stress the plant. Which greatly influences the development of grapes.
6. Pests can settle on grapes. They begin to damage the roots of the plant. And also suck in the juices of the bush. The root system can be damaged by rats, moles. They eat the roots. In this case, the whole plant withers, not just the leaves. Onion flies and ticks can settle on the surface of the plant. They feed on the leaves and the plant itself. Which leads to the rapid yellowing of the foliage of the grapes. The leaves begin to curl and fall off.

The reasons for the appearance of chlorosis on grapes

Yellow leaves can be caused by chlorosis on the plant. It appears only with some factors:

1. The soil is depleted.
2. The soil is infected with a nematode.
3. Bad weather such as constant rains.
4. Excess lime in the soil.

Before treatment, it is necessary to establish and eliminate the focus of the disease. First you need to remove diseased shoots, leaves and parts of the grapes. Note: The top of the grapes becomes pale. Then yellowish. And after that the leaves turn yellow. This means that chlorosis is due to a lack of iron. If the lower leaves began to turn yellow, this means a lack of nitrogenous fertilizers. Excess moisture can be one of the reasons for the yellowing of the center of the grapes. And also the close location of groundwater. In this case, the excess water should be removed by building a drain. Loosen the ground before doing this.

The most popular pests and diseases that attack grapes

Fungal diseases usually occur due to improper care. Or due to changing climatic conditions. And also because of the appearance of a pest. The following diseases are very common.

Gray rot. Causes rotting of berries or completely destroys the entire crop. It is a small coating of white. It becomes more and more significant every day. It can cause the foliage to dry out. For the treatment of this disease, it is necessary to provide ventilation of the grapes. And also spray the plant with Fundazol.

Fusarium... It appears in early June. It is recognized by its leaves. They become spotty. Spots of a yellow-greenish tint, usually dry. This disease spreads very quickly throughout the bush. First you need to remove all infectious leaves and burn. After treatment with an antifungal drug.

Oidium... A very dangerous disease. A white bloom with a grayish tint begins to appear on the foliage. The berries begin to burst to the pits. The vines turn yellow and dry. If the plant is not cured, it will not survive the winter and die. Fundazol treatment will save the situation.

Wilt... With such a disease, the leaves all dry out and turn yellow in 2 - 3 days. After that the whole bush withers. You need to quickly navigate and spill the bush with Previkur's solution (15 milliliters per 5 liters of water). Remove yellow and dry leaves, shoots. Burn them. And also treat the remaining foliage with vitriol solution.

What other diseases threaten grapes?

Mildew... Very dangerous for grapes. Because it lowers his immunity and resistance. It also reduces the yield to almost zero. As a rule, the leaves do not turn yellow completely. But only in patches, specks. And also begin to dry and fall off. Spraying with an Anrobat will help cure the grapes.

Root rot... The first symptom is yellow leaves and lethargy in the shoots. This is all the more noticeable when it rained. And also if abundant watering was made. Fungicides will help against this disease.

Black spot... It appears due to high humidity. As well as excess moisture in the soil. The leaves turn yellow. The places that have been hit are rotting. The color of the berries changes. The affected areas should be removed. Then treat the entire surface of the grapes with an antifungal agent.

Alternaria... Appears in early summer. Small yellowish spots attack foliage. Over time, the spots become darker and darker. Up to black. The plant must be treated with Bordeaux liquid.

Even a slight yellowing of foliage or shoots should prompt the grower to solve the problem. Because if the disease process is not stopped in time, it will spread quickly.

Leaves turn yellow in adult grapes

The bush, which has been growing in the garden for several years, very often suffers from a lack of useful trace elements. As well as various diseases. This is due to the weakening of the immune system due to age. Diseases are brought by insects, wind, ordinary rain. The first signal is the yellowing of the leaves.

It is not only illness that can be the cause. And also a sharp change in temperature. Transition from heat to frost and vice versa.Not only severe frosts can have a huge impact. But also small frosts. At the same time, it also ages faster, losing strength. Yellowing begins at the bottom and extends to the top.

The leaves of young grapes turn yellow

Cuttings that have just rooted have a weak immune system, like older plants. Therefore, they are also subject to frequent illnesses. If you carelessly handle or care for a plant incorrectly, it starts to show this through its appearance. And then the leaves of the grapes turn yellow. Improper care usually includes improper watering.

It is either too frequent. Or it is produced with cold water. And grapes prefer warm water. Incorrect application or fertilization will also result in yellow foliage. A young plant needs a lot of attention. To study all the features of this plant, you need to take a good look at it. And also observe for one year.

First Steps When Finding Yellow Leaves

1. If you notice yellow foliage on the grapes, you need to do a thorough inspection of the plant. Find the reason. You may notice a pest or spores. If there is neither a dispute nor a pest, proceed to inspect the diseased leaf. Find the beginning of yellowing, whether the sheet is curling or not. If so, shed the bush.
2. If bumps are present on the leaves, rats or mice have started in the ground. You can get rid of them with deterrent drugs. As well as accessories. When the growth stops or the vines dry out, it is possible to assert the presence of root rot.
3. If a whole leaf turns yellow at once, this means the presence of chlorosis. It is treated with fertilizers containing iron, nitrogen and potassium. And you can also shed and treat the surface and soil with iron vitriol.
4. If there are any insects inside the leaf, get rid of the infected leaves. And also spray with insecticides.
5. Very often, a yellowish-burgundy spot appears in the center of the leaf. It turns black over time. This means the presence of black rot or powdery mildew.

Prevention

In order not to suffer with treatment for serious diseases, grapes should be processed on time. That is, to carry out prevention. First, you need to remove all the weeds with high quality. And also debris from the soil, which very often affects the infection. Buds, leaves and all grapes can be treated with one of the following preparations: Bordeaux liquid, Maxim, iron vitriol, Fitosporin, Aktofit. And also colloidal sulfur, Trichodermin, urea, Vitaros.

A second prophylaxis is carried out against pests, usually they use Envidor or Oxyhom.

The following prophylaxis is carried out after the grapes have bloomed and after the harvest has been harvested. Experts recommend that prophylaxis be carried out even before wintering.

Loosening of the soil is very important for grapes, as its root system needs air. It is recommended to add peat to the soil so that the air is better absorbed into the soil. When the plant is replanted, drainage should be done, preferably very thick, to protect the root system from rotting. If the grapes have nowhere to transplant, then the excess water should be removed by making holes around it.

Top dressing must be carried out at the beginning of spring, when the grapes are in bloom and before wintering.

Many varieties need proper care, in the right place. This must be observed in order for the grapes to produce the largest possible yield.