What causes grape drops? What is the reason for the blackening of the grape stalks?

The cause of the grape drop after flowering may be due to overwateringThe amount of water will hinder the respiration of the root system, the growth will be hindered, and it is easy to drop grains. During the flowering and fruiting period, the water must be properly controlled. It may also be improper fertilization, high fertilizer concentration or raw fertilizer will bring fertilizer damage, pay attention to the use of thin fertilizer or decomposed fertilizer.

In addition, it may also be a lack of light, and it is difficult to sit still if you don't see light for a long time. Get more sun and fill in the light.

The requirements of the grapes for environmental conditions.

1. Light. Grapes are sensitive to light and are a typical light-loving fruit tree. When the sun is abundant, the grapes grow normally and produce robust trees and high yields of high-quality fruit.

On the contrary, when the light is insufficient, the plant has few new shoots, long internodes, and thin leaves, which is easy to cause flower and fruit dropping, and poor stress resistance.

Insufficient light during the coloring period will also affect the quality of the fruit, the fruit coloring is uneven, the sugar content decreases, and the taste is astringent and sour. Therefore, the planting site should be considered first, and the area with sufficient sunlight is preferred.

2. Temperature. Temperature affects the growth and development of grapes. Each growing period has different temperature requirements: the optimal temperature for shoot growth, flower bud differentiation, and flowering is around 20-30 degrees Celsius, below 15 degrees Celsius or above 40 degrees Celsius, which is not good for growth.

During the ripening period, the optimal temperature is between 20-32 degrees Celsius, the temperature is low, the light is insufficient, the coloring is uneven, the sugar content is reduced, the ripening is delayed, and the temperature is high, it is easy to cause sunburn. The temperature of the flowering period is more critical, when the temperature is 0-3 degrees Celsius, the flowers are easy to freeze, and the young fruits are easy to fall off.

3. Moisture. Water is the source of life, it is an important part of the grape plant, it can directly participate in the synthesis, decomposition, transport of nutrients and various physiological needs. The soil is well hydrated, the plants germinate early and neatly, the new shoots grow quickly, and the fruits are large.

If the soil is dry for a long time, the growth of branches and leaves is slow and the amount is small, which is easy to cause flower and fruit drop, diseases and pests, affect the smooth expansion of berries, and reduce the yield and quality.

This is usually grape rot. Grape fruits often produce irregularly shaped slightly concave brown spots from the fruit stems, and then the whole panicle turns brown and soft rot, and the upper fruit is slightly protruding gray-white dots, and the diseased fruit gradually dries up and shrinks into stiff fruit after losing water. When wet, the damaged part emits a moldy smell and the diseased fruit is easy to fall off.

Prevention and control measures: completely eliminate the fungus source after harvesting, completely clear the garden, burn or bury the diseased plant residue in a centralized manner, remove the diseased ears in time during the onset of the disease, and remove the diseased branches in time to reduce the source of infection. Strengthen cultivation management, improve the layout of the shelf, appropriately improve the fruiting parts, properly irrigate and drain, prune reasonably, change the ventilation and light transmission conditions, and reduce the humidity of the orchard.

In the early stage of drug prevention and control, spray 75% chlorothalonil 500 700 times or 25% carbendazim 250 500 times solution, and can also spray 40% ethylphosphine aluminum 200 300 times solution or 50% antibacterial special 600 800 times solution, and spray 1::200 times of Bordeaux solution according to the condition.

Raisin branch canker, this disease broke out in the grape veraison period, began to be difficult to veraison, gradually the fruit stalk turned black-brown, the fruit fell off the water jar, mostly broke out in the garden with too high yield, insufficient nutrition, too much rain, when the rain arrived, drip irrigation with benzoxystrobin twice per mu 200 ml, foliar spraying flusilazole, pyraclostrobin, azoxystrobin, pentoconazole, Fumei double control.

Summary. Reasons for grape grain loss: 1. Poor climate during the flowering period, too much rain, less light, and volatile temperature in the middle and late stages will lead to serious fungal diseases, such as gray mold, downy mildew, black pox, white rot, etc.

2. Improper use of hormones, uneven staining of the liquid medicine leads to grape grain loss (summer black). 3. Lack of trace elements boron and zinc leads to grape grain loss (Victoria grain loss and zinc deficiency). 4. Excessive growth and excessive nitrogen fertilizer application lead to grape grain loss (Jufeng).

5. Excessive yield will also lead to grape grain loss (red earth). Measures to prevent grape grain loss: 1. Combine environmental changes to prevent pests and diseases.

2. When using the regulator, it should be used in strict accordance with the dosage, combined with the climatic conditions, and should not be excessive or small 3. Timely supplement various trace elements. 4. Reasonably control the amount of nitrogen fertilizer applied, and apply less nitrogen fertilizer in the later stage 5. Strictly control the yield, and carry out reasonable load according to the condition of the tree.

Reasons for grape grain loss: 1. Poor climate during the flowering period, too much rain, less light, and volatile temperature in the middle and late stages will lead to serious fungal diseases, such as gray mold, downy mildew, black pox, white rot positive key, etc. 2. Improper use of hormones, uneven staining of the liquid medicine leads to grape grain loss (summer black).

3. The lack of trace elements boron and zinc leads to the loss of grapes (Victoria is deficient in zinc). 4. Excessive growth and excessive nitrogen fertilizer application lead to grape grain loss (Jufeng). 5. Excessive yield will also lead to grape grain loss (red earth).

Measures to prevent grape grain loss: 1. Combine environmental changes to prevent pests and diseases. 2. When using the regulator, it should be used in strict accordance with the dosage, combined with the climatic conditions, and should not be excessive or small 3. Timely supplement various trace elements.

4. Reasonably control the amount of nitrogen fertilizer applied, and apply less nitrogen fertilizer in the later stage 5. Strictly control the yield, and carry out reasonable load according to the condition of the tree.

What to do if the fruit stalk of the greenhouse of the sun is black.

The blackening of the fruit stalk is either a disease, a physiological factor of Zhengsheng, or a damage to external stimuli (such as agricultural laughter and medicine), which should be judged from cultivation management and climate.

Is there a way to cure it?

When the rain arrived, drip irrigation with benzostatin was used twice with 200 ml per mu, and foliar sprays of fluracillosiliconium, Changzheng pyraclostrobin, azoxystrobin, pentoconazole, and Fumei were used for double control.

Summary. 3. Fruit drop due to insect pests Grapes are susceptible to the influence of pests and diseases such as spider mites, aphids, powdery mildew, black brown disease, charcoal maggot, powdery mildew, etc. These pests and diseases will first attack the leaves, causing the leaves to dry up and wither and fall, causing the photosynthesis products to decline, resulting in nutrient deficiency of the fruit, resulting in fruit loss.

In high temperature and high humidity is the peak period for the emergence of pests and diseases, at this time, insecticides and fungicides can be sprayed on the front and back of the leaves, and the disease can be controlled by spraying several times in a row. Naphthalene acetic acid can also be sprayed 5-10 days before fruit picking, which can both reduce fruit drop before ripening and increase the coloration of the fruit.

There are many types of this, 1. Variety problems The defects in the structure of the female flowers, the degradation of the stamens and the growth of the filaments in the opposite direction are not conducive to the normal pollination of the grapes. Therefore, when planting Kyoho grapes, an appropriate amount of pollination trees should be configured to improve the pollination rate of Kyoho grapes, so as to reduce the phenomenon of flower and fruit drop of Kyoho grapes.

2. Physiological fruit drop When the grapes grow to 3-4 mm after fruit set, some fruits will be stunted due to nutrient deficiency, resulting in fruit drop. Therefore, after grape fruit set, it is necessary to carry out artificial fruit thinning and control the growth of new shoots, top application of phosphorus and potassium fertilizers, prohibition of nitrogen fertilizer and control of watering amount, which will reduce the occurrence of physiological fruit drop.

3. Fruit drop due to insect pests Grapes are susceptible to the influence of pests and diseases such as spider mites, aphids, powdery mildew, black brown disease, charcoal maggot, powdery mildew, etc. These pests and diseases will first attack the leaves, causing the leaves to dry up and wither and fall, causing the photosynthesis products to decline, resulting in nutrient deficiency of the fruit, resulting in fruit loss. In high temperature and high humidity is the peak period for the emergence of pests and diseases, at this time, insecticides and fungicides can be sprayed on the front and back of the leaves, and the disease can be controlled by spraying several times in a row.

Naphthalene acetic acid can also be sprayed 5-10 days before fruit picking, which can both reduce fruit drop before ripening and increase the coloration of the fruit.

4. Sunburn fruit drop After the grape fruit enters the hard core period, if the temperature exceeds 32 degrees, sunburn will occur, and fruit will fall with the empty stool of sunburn. Therefore, when building in summer, it is necessary to keep the secondary shoots that cover the fruit ears, and reduce some of the new shoots to reduce the appearance of sunburn.

My grape varieties are double excellent.

What medicine should I use,**.

Spray 30-40ml l of naphthalene acetic acid once every 15 days and spray twice.

Variety characteristics, overnutrition, poor management, meteorological factors, physiological fruit drop, pests and diseases.

Measures to prevent grape pellets:

1. Combined with environmental changes, do a good job in the defense of pests and diseases.

2. Pay attention to control the amount of adjustment and use it strictly in accordance with the dosage.

3. Timely replenishment of various trace elements.

4. Reasonably control the amount of nitrogen fertilizer and apply less nitrogen fertilizer in the later stage.

5. Strictly control the output, carry out reasonable load according to the condition of the tree, and do not overload.

1. Variety characteristics: The yield of red earth grapes is much higher, and the occurrence of grain loss will be more serious during the grape expansion and coloring period.

2. Excessive nutrition: too much nutrition, uncoordinated vegetative growth and reproductive growth, competing with each other for nutrients to speed up the drop, and the nutrition is uneven.

3. Poor management: pouring too much water and not pruning the paper strips in time led to poor ventilation, affecting pollination, and the lack of trace elements such as boron and zinc during the grape expansion and coloring period led to grape grain loss.

4. Meteorological factors: In the rainy season or strong winds, it can cause poor fertilization and a large number of fruit drops. Excessive rainfall, little sunlight and volatile temperatures in the middle and late stages of the grape can lead to a large number of grapes.

5: Physiological fruit drop: When the grape fruit is 3-4 mm large, it will fall due to malnutrition and stop developing.

6: Fruit drop from pests and diseases: Grapes are prone to disease in the rainy season, high temperature and wet season, among which downy mildew, anthracnose, powdery mildew, black pox, etc. will cause a large number of fruit grains to fall off. When it is high temperature and dry before and after ripening, it is susceptible to the damage of spider mites and causes fruit drop.

Spraying borax before and after the flowering period of grapes is conducive to improving their fruit setting rate, and timely supplementation of trace elements such as boron, zinc and copper by spraying foliar fertilizer. Select disease-resistant grape varieties with relatively healthy flower development, scientifically thin flowers and fruits, reasonably leave branches and fruits, and reasonable loads. Control irrigation from 3-5 days before grape flowering to flowering, and after flowering, it is necessary to irrigate and fertilize reasonably, apply more phosphorus and potassium fertilizers, and control nitrogen fertilizers.

1. What is the treatment for grape ripening and grain loss?

1. Borax can be sprayed before and after the grape flowering period, which will help improve its fruit setting rate and reduce grain loss. It can also be sprayed with foliar fertilizer to supplement grape with boron, zinc, copper and other trace elements in time to supplement the nutritional deficiency of the tree, promote fruit setting rate and reduce fruit drop. The regulator can inhibit the vegetative growth of grapes and improve the nutritional status of flowering, but the dosage must be strictly adhered to when using, combined with climatic conditions, and not excessive or small amounts.

2. If you want to prevent grapes from ripening and losing grains, you can choose disease-resistant grape varieties with relatively healthy flower development. When planting grapes, it is necessary to scientifically thin flowers and fruits, reasonably leave branches and fruits, reasonable loads, and maintain a stable tree potential. Before flowering, topping and controlling the secondary tips must be timely, and the head of the ear should be pinched about 1 week before flowering, and the secondary ear should be removed.

3. Irrigation must be controlled from 3-5 days before grape flowering to flowering, and reasonable irrigation and fertilization should be carried out after flowering, and more phosphorus and potassium fertilizers can be applied to control the amount of nitrogen fertilizer. Grape autumn topdressing is an important measure to ensure the nutrient storage of the tree, keep the tree healthy, ensure spring flowering, fruit set, and reduce fruit drop. If the basal fertilizer applied in the autumn is insufficient, then top dressing must be carried out in the spring with a small amount of nitrogen fertilizer.

2. What is the reason for the ripening and loss of grapes?

1. Characteristics of the variety.

1) The Kyoho cultivar has the characteristics of incomplete ovule development in genetics, and the ovule abnormality rate is as high as 48%, so its young fruits are weak in the competitiveness of nutrients, resulting in the phenomenon of fruit drop and grain loss.

2) Although the yield of red earth grapes is relatively high, there will be grain loss during the grape expansion and coloring period.

2. Nutrition**.

1) If the vine is too vigorous and the vegetative and reproductive growth is not coordinated, then they will compete with each other for nutrients and drop grains.

2) If the tree does not store enough nutrients, a large amount of nutrients will flow to the vigorous growth of new shoots or secondary shoots before and after the flowering period, and a large number of flowers and fruits will be caused without reasonable control.

3) Insufficient nutrient storage in the early stage of growth will cause ovule dysplasia, resulting in grain loss.

4) Improper use of hormones and uneven liquid medicine will also lead to grape grain loss.

3. Poor management.

1) If nitrogen fertilizer is applied and irrigation is too much before grape flowering, it will lead to vigorous growth of branches and leaves, too dense branches, poor ventilation, pollination, etc., which will cause a large number of grapes to fall flowers and fruits.

2) If there is a lack of trace elements such as boron and zinc during the grape expansion and coloring period, it will also lead to grain loss.

Summary. Hello, it is because about a week before the flowering of grapes, a large number of flower buds fall off, and a large number of ovary after flowering, the rate of flower and fruit drop is more than 80%, resulting in scarce fruits, called flower and fruit drop disease. Before and after flowering, grapes are affected by adverse environmental and climatic conditions, which makes the flower buds unable to fertilize normally, resulting in a large number of flower and fruit drops.

The control method is to pay attention to irrigation about half a month before flowering, spray borax brown sugar "Tianda 2116" 600 times liquid on the foliar surface, and control irrigation during flowering. Then, after the fruit ear is elongated, the secondary panicle is removed and the tip of the ear is pinched in time, and the new shoot topping is carried out 2 to 3 days before flowering to control vegetative growth, promote reproductive growth, and improve the fruit setting rate.

Hello, I have seen your question and am sorting out the answer, please wait for a while Hello, I have seen your question Ha Now I am manually replying to the content for you, but it will take a little time, please wait patiently, thank you Thank you I am here to wish you a prosperous Year of the Tiger

Hello, it is because about a week before the flowering of grapes, a large number of flower buds fall off, and a large number of ovary after flowering, the rate of flower and fruit drop is more than 80%, resulting in scarce fruits, called flower and fruit drop disease. Before and after flowering, grapes are affected by adverse environmental and climatic conditions, which makes the flower buds unable to fertilize normally, resulting in a large number of flower and fruit drops. The control method is to pay attention to irrigation about half a month before flowering, spray borax brown sugar "Tianda 2116" 600 times liquid on the foliar surface, and control irrigation during flowering.

Then, after the fruit ear is elongated, the secondary panicle is removed and the tip of the ear is pinched in time, and the new shoot topping is carried out 2 to 3 days before flowering to control vegetative growth, promote reproductive growth, and improve the fruit setting rate.