Why do grapes crack during the ripening period and how to treat the disease

Why do grapes crack during the ripening period and how to treat the disease


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The question of why grapes can crack during the ripening period is of interest to many novice winegrowers. Growing grapes is a difficult but fascinating process, the harvest is awaited with great impatience, so it is very disappointing when the grapes poured into juice begin to crack. The bunches lose their presentation, they can no longer be stored for a long time, this can spoil the mood for a long time.

Grape varieties prone to cracking

Global warming and the work of breeders have made it possible to grow grapes in regions where such a thing had never been dreamed of before. At the same time, gardeners faced a problem - an abundance of rain and some other reasons lead to cracking of the berries.That is why a novice winegrower needs to carefully choose the varieties that are supposed to be planted on their site. Some of them are prone to cracking berries, even with proper care and adherence to all agrotechnical conditions.

The following problem was noticed in:

  • Laura;
  • Raisins;
  • Beauties;
  • Viking;
  • Rhizomata;
  • Bullfinch and some other varieties.

It has been noticed that grape varieties with a high sugar content and thin skin are more likely to crack.

Why do berries crack during ripening

They can crack not only from excess moisture, such a problem can arise when grapes are damaged by diseases (powdery mildew), with an excess of nitrogen fertilizers in the soil.

There is no unequivocal opinion today about what grapes burst, so the most common of the possible reasons should be considered.

Excess moisture

Grapes need a lot of moisture before flowering. A flowering vine needs much less water, and during the formation of the ovary and the development of the grape bunch, the need for watering again increases.

If the bushes suffer from a lack of moisture, and this period coincides with the onset of rainy weather, the berries begin to intensively absorb water.

In this case, their skin does not have time to stretch and bursts.

Inadequate nutrient content

Lack of nutrients is the second reason for cracking grapes. The more fertile the soil, the less the grapes burst when ripe. The plant needs fertilizing with nitrogen, phosphate and potassium fertilizers.

Disease affection

Berries burst when the bush is affected by powdery mildew. Timely spraying prevents the spread of downy mildew and protects bushes from diseases, and berries from cracking. There are varieties that are most susceptible to powdery mildew (for example, Kishmish); in this case, the processing of the vines is carried out every 3 weeks, before the grape bunches are filled.

Varietal features

Grape growers have long noticed that varieties with large green berries in a bunch crack more often. Small berries and dark grapes, with slightly less sugar and denser skins, are much less prone to cracking.

Prevention and elimination of the disease

Bursting berries is a loss of yield, and the flowing juice attracts pests and provokes the onset of the development of various diseases. That is why the problem must be dealt with.

How to irrigate

Grapes do not like cold water, so the plants are watered from a barrel, where the water has settled and warmed up by the sun. Watered depending on weather conditions. On average, it is enough to water the grape bushes once a month. Abundant watering is carried out after flowering, when pea-sized berries appear.

Important: the amount of watering depends on the region in which it grows; when watering, it is more correct to be guided by weather conditions.

The next time the grapes are watered at the end of July. In August, only late varieties are watered, the collection of which occurs at the end of September or the beginning of October. Earlier varieties do not need to be watered.

Correct fertilization

Nitrogen is very important for grapes, the condition of the vine, the size of bunches and berries, and the amount of harvest depend on it. However, an excess of this element in the soil leads to cracking. Grapes need mineral and organic fertilizing. The best organic fertilizer is rotted manure or compost. For fertilizing with mineral fertilizers, Kemira, Novofort, superphosphate are used.

The first feeding of adult bushes is carried out in the spring, soon after the opening of the vine. The bushes are fertilized with a mixture of superphosphate, ammonium nitrate and potassium salt. 20x10x5 grams are dissolved in 10 liters of water. Such a solution is prepared for each bush. The second such top dressing is applied a week before flowering.

There are no nitrogen fertilizers in the third top dressing. It is introduced during the ripening period of berries, because excess nitrogen is harmful to the ripening crop. In addition, during the period of flower emergence, after flowering and during the ripening of grapes, foliar dressing with complex preparations is used, which are easy to purchase in specialized stores. They must be used in accordance with the manufacturer's recommendations.

Reducing the negative impact of nitrogen fertilizers

Bird droppings are considered an excellent fertilizer for grapes, but it should be borne in mind that it contains a large amount of nitrogen, therefore it is not used during the ripening period of berries.

Increase the positive effects of potassium and phosphorus

It is potassium and phosphorus that are additionally introduced when the berries begin to ripen. Phosphorus and potash fertilizers are used once every 3-4 years, in cases where the vineyard is located on fertile soils. When growing on sandstones, they must be applied every 2 years.

Processing bushes with burst berries

If there are a lot of burst berries in the bunch, you should get rid of it. Such clusters are carefully trimmed. With an insignificant amount, cracked berries are cut from the bunch with blunt-ended scissors.

It is imperative to remove damaged fruits - they attract wasps, birds, insect pests, and contribute to the development of fungal diseases. Of course, completely eliminating the cracking of grape berries will not work, but these simple tips will significantly reduce the associated yield losses.


Watch the video: Оидиум на винограднике. Oidium in the vineyard


Comments:

  1. Dosho

    They are wrong.

  2. Sham

    the graceful phrase

  3. Kaarlo

    And that we would do without your remarkable idea

  4. Ashvik

    In it something is. Thank you for the help in this question, can I can I help that too?



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