What is the reason why these two grapes in my yard were fine some time ago, but they have turned yel

Generally speaking, the yellowing and wilting of grapes is due to these reasons, which can be identified according to the actual situation.

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.

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.

If the fertilizer supply is insufficient, the grapes are defertilized, and it is likely that there is a problem with the grape root system, which can be alleviated by microbial inoculants and rooting agents. It may also be the use of hormone-based fertilizers, which leads to premature aging of grapes, so it is best not to buy hormone-containing fertilizers when fertilizing in the future.

Top dressing: Top dressing is selectively fertilized according to the different phenological stages of the grapes. It can be divided into germination fertilizer, flowering fertilizer, fruit strengthening fertilizer and ripening fertilizer. The exact amount of fertilization should be based on the yield requirements of the tree and the fertility of the local soil.

Germination fertilizer: about February to apply a germination fertilizer, germination fertilizer is mainly nitrogen fertilizer, can use Yanwo water-soluble fertilizer nitrogen fertilizer, using furrow application or hole application.

Pre-flower: In late April, apply a pre-flower. Pre-flowering fertilizer, mainly nitrogen fertilizer and phosphorus fertilizer, with Yanwo water-soluble fertilizer high nitrogen and high phosphorus type, need to be watered immediately after fertilization.

Fruit-strengthening fertilizer: Yanwo potassium fertilizer can be used, and furrow application or hole application is still used.

The growth period of young fruits is the peak fertilizer demand of grapes in a year, and fertilization at this time not only promotes the growth of young fruits, but also has a good effect on the growth of branches and leaves of the year.

Coloring fertilizer: also known as ripening fertilizer.

Post-harvest fertilizer: After the fruit is harvested, due to the large nutrient consumption of the tree, fertilization is required to ease the tree and delay defoliation.

In recent years, with the improvement of grape fertilizer and water management technology, irrigation fertilization has been gradually adopted to replace traditional fertilization methods in production.

Top dressing begins in mid to late April, and fertilization is carried out using drip irrigation. 2kg of water-soluble compound fertilizer with nitrogen, phosphorus and potassium content of 15:15:15 can be applied per mu, which can be used at the same time as water-soluble fertilizer and water fertilizer, once a week, during which the soil is kept moist.

At the same time, during the grape growing season, according to the grape's nutrient requirements, topdressing can be carried out outside the roots. If the grapes are sprayed with foliar fertilizer after fruit set, they can continue to supplement nutrients, and Yanwo potassium dihydrogen phosphate can be used to supplement the phosphorus and potassium needs of the tree. 7-10 days after fruit harvest, it helps the plant to regulate growth, promote nutrient absorption, and restore the tree's vigor as soon as possible.

Hello, it is an honor to be able to answer this question for you There are the following possible reasons for the total wilting of grapes after flowering:1Pests and diseases:

Grapes can be attacked by pests and diseases, especially downy mildew, black rot, powdery mildew and other common grape diseases, which can easily lead to wilting if not controlled in time. 2.Lack of water or over-luck old talk about watering:

Grapes need plenty of water during the flowering season, and too much or too little watering can cause problems with the vines and cause wilting. 3.Improper fertilization:

If the vine is not properly nourished**, it will affect its health. Excessive fertilization or improper fertilization periods can also affect the growth and fruiting of the grapes. 4.

Temperatures that are too high or too low: Grapes are very sensitive to temperature changes, and if the temperature is too high or too low, it can cause post-flowering wilting. If there is a wilting of grapes, it is necessary to rule out the above possible causes in time, and treat the symptoms**.

In the daily cultivation process, it is necessary to pay attention to reasonable fertilization, regular prevention and control of pests and diseases, and ensure the hygiene and stability of the grape growing environment. 

Portugal changed the stuffy grape leaves which season nuclear friends bend the yellowing grapes did not sell the lower part of the old leaves individually yellowing, some time ago after the sale of the garden in the past few days found a lot of old leaves yellow, as well as the phenomenon of falling to the balance of leaves, what is the reason?

Hello, according to your question, the following answers are made: Causes of yellow leaves around September: 1. From the distribution of yellow leaves If the appearance of yellowing symptoms in the vineyard, the distribution is evenly distributed, or it is clearly peeled, which is usually absorbed by the soil environment, plant roots and fertilizer management, and the effects of infectious diseases are eliminated on the basis of the loss of spring.

If it is found that the symptoms of the leaves spread gradually, or if they have a flaky distribution, they can cause diseases, and it is necessary to observe the comparison and take appropriate pharmacies for targeted prevention and **. 2. If the vineyard has a time concentration from yellow leaves, and the pathogenesis is consistent, it is necessary to consider the problems of disease, drug damage and water management; If it's a specific line time and the blade has a macula or other color spot, then options need to be considered; Finally, it is necessary to take into account the special weather in continuous rain. The yellowing of the leaves in the orchard is evenly distributed, which spreads slowly.

The likelihood of infectious diseases is relatively high.

There is a problem with the root system of the grapesBecause 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.

The amount of water is not evenly controlledGrapes 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.

Absence of trace elementsIf 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.

There are many causes of raisin dryness, management methods, root damage, fungal and other diseases and infections, all of which can cause raisins to dry up.

Grapes hanging on the tree, withering or drying up, may be a mistake in management.

If the leaves turn yellow and fall off from the lower part, it is likely to be caused by an injury to the root system.

How the grapes are cared for.

2.Apply sufficient base fertilizer: the base fertilizer is mainly rotted farmhouse fertilizer, supplemented by chemical fertilizer. Timely top dressing, mainly water-soluble fertilizer for fertile leaves.

3.Prevent the cut bud from drying or being damaged. The pith of the vine is larger, the tissue is looser, and the water is easy to evaporate, so the cut should be 3 5 cm away from the bud eye when pruning.

4.Tidy up the garden: remove the fallen leaves and weeds, and burn them intensively (the fallen leaves cannot be used as fertilizer).

5.Winter pruning is pruned in December to January after defoliation to before the wound flow, first thinning dense branches, diseased branches and old vines, and then cutting the fruiting mother vine into long tips, middle shoots and short tips, of which each fruiting mother vine leaves 8-11 buds, 5-7 buds in the middle shoots, and 2-4 buds in the short shoots.

6.Reasonable fertilization In late autumn and early winter, fertilize when the leaves are wilting, mainly with well-rotted farmhouse fertilizer, supplemented by chemical fertilizer.

Causes and solutions for yellowing of the leaves of the vine.

1. Improper watering.

Potted vines require a lot of water, and too much or too little water can have a big impact. Overwatering will have a greater impact on the growth of new leaves, and they will become thin and yellow, with a dull color. Insufficient watering will damage the old leaves, resulting in wilting and scorching yellow, and the leaves will fall off one after another.

Solution] When the summer is hot, water it once a day in the morning and evening. In autumn, the amount of watering should be appropriately reduced, and it should be watered once every two days. In winter, the plants are dormant, and watering only needs to keep the potting soil moist, about once a week.

In the spring, the plants sprout and need to be watered every 2 to 3 days to keep them well hydrated.

2. Improper fertilization.

Lack of fertilizer in potted vines can cause new leaves to turn pale and yellowish in color, and old leaves to become malnourished. Excessive fertilization will seriously affect the growth of flowers, the color of the flowers will turn yellow, the new branches will be dull and the leaves of the old branches will fall off.

Solution]: When we fertilize potted vines, we should pay attention to thin fertilizer and frequent application. In spring, nitrogen fertilizer should be applied to promote flowering.

Then top dressing phosphorus and potassium fertilizer to ensure that the fruit is nutritious. During the growing period, the vines should be fertilized about once every four days, and when their roots are firmly established, the use of urea and potassium dihydrogen phosphate should be increased appropriately, and a thin fertilizer should be applied once every three days.

3. Insufficient light.

Potted vines like light, and potted vines that have been planted indoors for a long time will not be able to photosynthesize normally due to the lack of light, so the leaves will turn yellow and fall off one after another, and the new leaves will be thin and thin, and in severe cases, it will even lead to the death of the whole plant.

Solution]: When we plant grapevines, we should ensure that they are given enough light to promote the growth and development of grapes. It is best to move it outdoors, in a window, or in a sunny place to promote chlorophyll growth.

4. Strong light irradiation.

Excessive light exposure can also damage the vines, causing leaf burns, dry and yellowish flowers and branches in the sunrise area, yellow spots on the surface of the grapes, and reduced fruit quality.

Solution]: We should pay attention to shade during the high temperature in summer and keep the vine growing environment ventilated and breathable. Many flower lovers may only know what to do when the leaves of potted vines turn yellow, but they don't know that light can also have a huge impact on grape fruits.

Proper light can not only change the yellowing of the leaves of the vine, but also make the fruit juice full, sweet and sour.

5. Pest and disease hazards.

When we care for the vines, we may notice small white spots or black-brown spots on the leaves, which may be gray mold and black pox. In addition to this, there are many other diseases that can cause yellowing of leaves, such as anthracnose, white rot, downy mildew, white rot and black rot.

Solution]: Once pests and diseases are found, we should remove the yellowed leaves and dead branches in time, and then spray 1500 times the solution of Sukrin to prevent and control gray mold, and spray 200 times the amount of Bordeaux liquid, 600 times the mancozeb or 800 times the solution of DuPont Fuxing to kill the black pox. If it is other diseases, it is also necessary to prescribe the right medicine, observe carefully, and prevent and treat it as soon as possible.

Web Links.

1. There is a lot of rain, high temperature and high humidity cause bacterial infestation, resulting in rot disease. When the rainy season comes, it is necessary to take precautions.

2. Fruit "color disease" is a common physiological disease in grape producing areas. The disease is mainly caused by nutritional deficiencies or disorders. Occurs during the ripening period of berries.

In the early stage of the disease, dark necrotic spots first appear at the fruit stalk, cob shaft, and spike stalk, which gradually expand, and in severe cases, it will cause annular necrosis in a certain part.

3. This disease generally occurs in weak trees, heavy topping, excessive load, insufficient fertilizer and small effective area. When the groundwater level is high or when it rains at maturity, especially after high temperatures, the disease is also severe when the field is humid and the temperature is high.

4. Prevention and control measures: use disease-resistant varieties. Different varieties have different degrees of sensitivity to the disease, some varieties are more sensitive, and some varieties are not.

Therefore, it should be taken into account when selecting varieties. Reasonable fertilization to control the tree potential. Reducing the use of nitrogen fertilizer, preventing overgrowth, and cultivation measures such as pruning, defoliation, and ring stripping during flowering can reduce the occurrence of the disease.

Strengthening the management of soil, fertilizer and water, increasing organic fertilizer and spraying phosphorus, potassium, magnesium and calcium fertilizer outside the root can effectively prevent the occurrence of the disease. Reasonable control of the load is the most effective measure to prevent the disease. Leave more primary and secondary tip leaves.

Under the premise of appropriately retaining more fruiting branches and ensuring yield, the method of "one branch and one ear" can reduce the occurrence of the disease. Pinching the tip of the ear and pinching the secondary ear can also effectively reduce the occurrence of disease visits.