What is the reason for the withering of the tips of the vines?

Improper watering, excessive temperature, improper fertilization.

1. Improper watering.

When we plant grapes, we are always worried about the lack of moisture in the vines, so we water them profusely, especially during the fruit-bearing period. As everyone knows, too much water will lead to a decrease in the permeability of the soil, which will lead to a lack of oxygen to the roots, which in turn will lead to a "lack of power" for nutrient transport. In this case, some weaker leaves are difficult to obtain enough nutrients in the "group competition", resulting in yellowing and drying of leaves due to nutrient deficiency.

2. The temperature is too high.

In the hot and high temperature summer, due to the intensification of transpiration, some of the more immature leaves will lose water quickly, if the water content in the tree is not very sufficient, it is difficult to give the immature leaves ** sufficient water. In this case of "dehydration", coupled with high-temperature baking, the leaves will appear yellow and dry.

3. Improper fertilization.

Grape fertilization should also be scientific, not over-fertilized. If too much fertilization is applied, fertilizer damage will occur. The most common result of fertilizer damage is: yellowing and dryness of leaves.

4. Threat of pests and diseases.

In the case of serious damage from pests and diseases, the leaves will also turn yellow. For example, if a grape is infected with a viral or fungal disease, the leaves will turn yellow.

5. Pesticide diseases.

Some pesticides combine with moisture in the air to produce heat, which can burn the leaves of the grapes, causing them to turn yellow and dry up.

6. Lack of nutrients. 1) Magnesium deficiency yellowing.

If the old leaves are yellow, the new leaves are normal, and only the veins are yellow, and the veins are still green, then it is likely that the lack of magnesium is yellowing and drying. The solution is to spray riberi yanwo chelated calcium and magnesium fertilizer on the foliar surface, which is convenient to apply.

2) Iron deficiency yellowing.

If the new leaves are yellow, the old leaves are normal, and only the veins are yellow, and the veins are still green, then it is likely that the iron deficiency is causing yellowing and drying.

There are many factors that can cause the tip of the vine to wilt, such as too little watering, too much light, too much fertilization or disease.

If you find that some parts of the grape branches are red and cracked, then your grapes are likely to have vine blight.

Grape vine blight, also known as vine cutting disease, stem point mildew blight, etc., is a fungal disease that harms grape vines and new shoots.

Generally, the orchards with heavy rain and high humidity, low-lying terrain, heavy soil, poor fertility, severe frost damage and other root diseases are prone to disease, and most of them occur on the branches and vines that are more than 2 years old, and also harm new shoots and fruits, etc., once the disease occurs, it will continue to occur for 2-3 years.

The pathogen of vine blight overwinters with hyphae or conidia, and spreads by wind and rain in May and June of the following year, invading through wounds, skin pores or stomata, and spreading through phloem or xylem.

Symptoms do not begin until 4 weeks after infection, and older branches may remain dormant for a longer period of time.

In the early stages of the disease, the branches will appear with sunken dark purplish-brown or dark red lesions. In the later stage (autumn), the epidermis of the susceptible branches is longitudinally cracked and easy to break, and there are black granular fruiting bodies of the fungus outside the diseased part.

The new shoots are susceptible, with reddish-brown lesions appearing first, and then the lesions are longitudinally cracked inward, affecting the growth and development of leaves and fruits.

How to prevent it? (1) Agricultural prevention and control.

When carrying out agricultural operations, it is necessary to reduce the damage to roots and stems.

Secondly, it is necessary to form a good soil environment by increasing organic fertilizer, biological organic fertilizer, bacterial fertilizer, etc., inhibit the growth of pathogenic bacteria and promote the growth of grape roots.

In the usual management, combined with pruning, remove diseased branches and residues in time, pay attention to frequent renewal of branches and vines, and maintain the growth vitality of grapes.

2) Chemical control.

Combined with the garden, spray 5 Baumé stone sulfur mixture, or 50% chlorobromoisocyanuric acid wettable powder 750 times before flower bud germination, to remove the source of overwintering bacteria.

At the beginning of summer, 75% oxime tebuconazole dry suspension agent, mancozeb, propylene zinc, etc., can be used to prevent the spread of pathogens, focusing on spraying the base and new shoots of old vines.

After the onset of the disease, it can be treated with 750 times of 85% substylin and dyschloride wettable powder, and 1000 times of 65% oxime fungus and flusilazole wettable powder.

1.Dead vines can be caused by a lack of nutrients, moisture, or too much sunlight.

2.When there is a lack of nutrients, the dead branches should be cut off and the nutrients can be supplemented, and nitrogen, phosphorus and potassium compound fertilizer or rotted farmhouse fertilizer can be applied.

3.When the soil is dry, water should be given in time to ensure that the moisture in the soil is sufficient, and the slightly moist state should be maintained.

4.During the seedling period, it should be placed in a astigmatism place, and it should not be exposed to strong light.

Dry edges of the leaves of the vine or even the whole tree is a grape brown spot disease. Brown spot disease is caused by Pseudocercosa grapes infection, mainly for the damage to leaves, the infection point is light brown, irregular angular spots in the early stage of the disease, the lesions gradually expand, the diameter can reach 1 centimeter, the lesions from light brown to brown, and then turn russet, the periphery is yellow-green, when the number of spots is severe, the edge is clear, the back of the leaf is blurred, the disease part dies in the later stage, and gray-brown mildew occurs when it rains or humidity. Some varieties have lesions with inconspicuous wheel lines.

Brown spot parvia is caused by the parasitism of Cercospora fasciolia, and the onset of the infection point appears as a small yellow-green round spot and gradually expands to a round spot of 2-3 mm. The lesions gradually die and turn brown and then brown, and the black mold layer grows on the back of the leaves in the later stage.

Please wait a moment, kiss me.

Dry edges of the leaves of the vine or even the whole tree is a grape brown spot disease. Brown spot disease is caused by Pseudocercosa grapes infection, mainly for the damage to leaves, the infection point is light brown, irregular angular spots in the early stage of the disease, the lesions gradually expand, the diameter can reach 1 centimeter, the lesions from light brown to brown, and then turn russet, the periphery is yellow-green, when the number of spots is severe, the edge is clear, the back of the leaf is blurred, the disease part dies in the later stage, and gray-brown mildew occurs when it rains or humidity. Some varieties have lesions with inconspicuous wheel lines.

Brown spot parvia is caused by the parasitism of Cercospora fasciolia, and the onset of the infection point appears as a small yellow-green round spot and gradually expands to a round spot of 2-3 mm. The lesions gradually die and turn brown and then brown, and the black mold layer grows on the back of the leaves in the later stage.

There may be the following reasons: 1. Caused by drought: The leaf scorching caused by drought mainly occurs on the base few leaves of newly planted seedlings or cuttings in the current year.

At first, the edge of the leaf turns yellow and dry, and then gradually expands, and in severe cases, the whole leaf will dry up and fall off. It is a large perennial tree with few dry leaves. 2. The cause of the sunburn:

The time for the grapes to grow new branches and leaves, mostly in May and June, this time is weak, and it is cloudy and rainy, the leaves are thin and tender, and after the rainy season, there are more sunny days, the sun is fierce, and the sultry cherry blossoms are rising, so that the edges of the grape leaves are easy to be burned by the scorching sun and scorched. 3. Caused by salt damage: the salinity content in the soil is high, and the leaves will turn yellow and dry up, especially in the spring drought ridge disturbance, the soil will return to alkali, and the seedlings will be more serious when they first germinate.

4. Caused by fertilizer damage: too much phosphorus fertilizer is applied in winter, and too little nitrogen fertilizer, and the leaves do not grow enough nitrogen fertilizer, and the leaves will be scorched. 5. Caused by drug damage:

Improper use of drugs or excessive concentrations can cause necrosis of leaf tissues and large areas of leaf scorching. 6. Caused by potassium deficiency: grape potassium deficiency will appear on the edge of the leaves.