What to do if the leaves of the vine turn yellow and dry?

Leaf spot.

This is a common disease caused by a fungal infection, when the vine becomes ill, brown spots appear on the leaves, thickening the lesions, and then the spots become connected in one piece, causing the leaves to start yellowing and eventually causing the leaves to fall.

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The main causes of yellowing of the grape leaves:

1. The growth and development of the root system is affected. The leaves of the plants with physiological diseases are small, thin and yellow, and the roots are mostly black and yellow, and the root rot occurs seriously. The causes of poor root development are related to excessive use of chemical fertilizers, or the use of non-rotten organic fertilizers, or overloading of fruits.

2. Imbalance of nutrients. In grape fertilization, fruit farmers pay attention to the use of nitrogen, phosphorus and potassium macroelements, and do not apply or apply less medium and trace element fertilizers, due to the irrational use of a large number of elements, resulting in antagonism between nutrients, which affects the absorption of nutrients by grapes at the same time, but also causes pollution to the soil.

3. The soil aggregate structure is not good and the permeability is poor. The growth of crop roots is inseparable from air, good soil aeration conditions play an important role in the growth of roots, the release of nutrients and the activities of soil microorganisms, and the poor aeration of compacted soil will cause obstacles to root development, especially the development of capillary roots, which will affect the absorption of nutrients by roots, resulting in the deficiency of trace elements, and the symptoms of deficiency will be shown on the leaves.

Solution: 1. Reasonable fertilization. The combination of macronutrients and trace elements, inorganic fertilizers and organic fertilizers, and chemical fertilizers and microbial fertilizers are combined to achieve full nutrient fertilization.

2. Spray foliar fertilizer. According to the situation, avoid the flowering period and spray foliar fertilizer regularly and irregularly to increase nutrition and improve tree strength.

3. Increase the application of soil conditioner. To create good rhizosphere conditions for root growth and development, improve soil aeration, adjust soil pH value, and promote the rapid formation of soil aggregate structure.

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!

If the leaves of the vine turn yellow and dry, it is necessary to prune the foliage, control watering and fertilization, regulate the light, and pay attention to the control of pests and diseases.

1. Prune branches and leaves

Cut off the yellowing and dry leaves, branches and leaves reasonably, cut off all the aging branches, and remove the sick and weak branches in time.

2. Control watering

Lack of water can cause the leaves to turn yellow, so you need to water them in time to keep the soil moist. Overwatering or not draining in time during the rainy season will also cause the leaves to turn yellow, so reduce watering and remove stagnant water in time when there is a lot of rain.

3. Control fertilization

Too much fertilization can burn the root system, causing the leaves to turn yellow, and watering can be done to dilute the concentration of nutrient fertilizer. Lack of fertilizer can also cause yellowing of leaves, so add a small amount of vinegar when fertilizing.

4. Adjust the lighting

Insufficient light can cause yellowing of leaves, and insufficient natural light can be used to increase the light by artificial lighting. When there is a lot of strong light weather, it is appropriate to take a semi-shaded way to avoid long-term direct sunlight.

5. Prevention and control of pests and diseases

To remove the yellow leaves in time, you can spray insecticides for control.

The methods of rescuing the yellowing and drying of the leaves of the vine include water control, suitable light, increase or decrease of fertilizer, replacement of soil, external damage to the spine or pests and diseases, as follows:

1. Control moisture.

If the leaves of plants are yellow, look at the soil moisture first, then generally check whether the soil is short of water, or too much watering will also cause the leaves to turn yellow. The edge of the leaf is a phenomenon of water shortage, which should be watered in time and slowly infiltrated to ensure that the soil locks in water and alleviates the phenomenon of yellow leaves; The yellowing of the new leaves and the lack of luster are a phenomenon of excessive moisture, and the water should be stopped immediately.

2. Appropriate lighting.

Carefully check whether it is due to the yellowing of the leaves caused by insufficient concealed light for a long time, remove the concealment measures in time, and supplement the light; On the contrary, long-term direct sunlight will also cause yellowing, dryness and burn of leaves, and shading measures should be taken in time to alleviate it.

3. Increase or decrease of fertilizer.

The yellowing of grape leaves may also be caused by no top dressing, less top dressing, and improper top dressing. During the growth period, grapes should be supplemented with fertilizers in a timely manner according to their growth, generally using fertilizers such as phosphorus and potassium, and adding some trace element fertilizers to maintain the plant's absorption and rapid growth.

4. Replace the soil.

If the soil environment is not good, it will also cause the leaves of the grapes to turn yellow. It is necessary to choose loose and breathable soil to ensure that the grape roots can breathe and grow, and after the plant grows steadily, the soil should be properly turned to avoid soil compaction and hinder growth.

5. External damage or pests and diseases.

Check whether the branches and roots of the plant are damaged and broken, and the external force will also affect the growth of the plant, and the leaves will turn yellow. In addition, the appearance of pests and diseases will also affect the growth of grapes, resulting in yellowing of leaves, and it is necessary to spray drugs in time according to the situation.

1. Causes of yellowing of grape leaves:

1. If the leaves of the whole garden are yellowed quickly, it is likely to be a pesticide damage; (Because of the lack of nutrients or diseases, it is unlikely that the whole garden will break out soon).

2. If it is sporadic and some plant leaves are yellowing and there is a process, it may be a deficiency of nutrients, root disease or leaf disease;

3. If the yellowed leaves have green veins, but the veins are yellow, it may be iron deficiency or magnesium deficiency. We can continue to subdivide, if the old leaves are yellow, the new leaves are not yellow, they can be identified as magnesium deficiency, if the old leaves are not yellow, the new leaves are yellow, they can be identified as iron deficiency;

4. If the veins of the yellowed leaves are yellow and the veins are green, then it can be identified as a viral disease;

5. If there are yellow spots on the yellowed leaves, and the yellow spots are slowly necrotic, it can be identified as a fungal disease of the leaves;

6. If the yellowed leaves first dry up from the edge of the leaves, but the leaf veins and leaf veins are still normal, then it can be identified as root damage or fertilizer damage;

What are the prevention and control measures for yellowing of grape leaves?

1. Yellowing of leaves caused by pesticide damage.

The yellowing of the leaves caused by the pesticide damage is generally manifested in 3-5 days after the spraying, and the location of the pesticide damage is not the old leaves, nor the new leaves, but the middle leaves, and it is the yellowing of the whole garden.

1) Mancozeb pesticide damage.

pesticide damage caused by inferior mancozeb;

The use of low-quality mancozeb leads to yellowing of leaves.

Generally, it is not recommended to use non-complexed mancozeb at the young leaf stage and young fruit stage, and it is recommended to use high-quality fully complexed mancozeb, mancozeb or propylene zinc.

2) Symptoms of drug damage caused by organophosphate agents.

The leaves are tender in the young fruiting stage of grapes, and the use of organophosphate agents in hot weather will also cause burns and yellowing. The picture above** shows the yellow leaves produced after the use of organophosphate-containing agents.

3) The pesticide damage caused by the fogging machine.

The spraying of the mist machine saves water and trouble, but if it is not operated properly, it will lead to uneven local medication and drug damage symptoms.

2. Yellowing of leaves caused by nutrient deficiency.

1) Magnesium deficiency yellowing.

Magnesium deficiency causes yellowing, which does not occur in the whole garden, and manifests itself as yellowing of old leaves and normal of new leaves; And only the veins of the leaves are yellow, and the veins are still green.

2) Iron deficiency yellowing.

Iron deficiency causes yellowing, which does not occur in the whole garden, and manifests: new leaves are yellow, old leaves are normal; And only the veins of the leaves are yellow, and the veins are still green.

3. Yellowing of leaves caused by viral diseases.

The yellowing of leaves caused by viral diseases occurs sporadically, mainly manifested in the yellowing of leaf veins, which are still green between leaf veins.

4. Yellowing of leaves caused by fungal diseases.

Leaf disease causes yellowing, which only forms small yellow spots on the leaves, and then the lesions dry up and die.

5. Yellowing of leaves caused by fertilizer damage and root damage.

The yellowing of the leaves caused by this cause first appears as a yellowing of the edges of the leaves, followed by gradual drying, rather than starting from the inside of the leaves. The above are several causes of yellowing of grape leaves, in production, find the cause of the disease, and deal with it accordingly.