The cause of grape fruit cracking

Grape fruit cracking mainly occurs in the berry ripening stage, it is a physiological symptom of grape, turned into pericarp cracking. The pulp is bare, the reduction is the commodity value, and after cracking, the fruit juice overflows, water loss, easy to cause dried fruit or suffer from diseases and insect pests, increase the loss. So do you know what caused the cracking of grapes? The following editor brings several major reasons for grape fruit cracking, let's take a look.

1. Variety

There are a variety of grape varieties, and different varieties have different pulp softness and pericarp thickness, so they have greater anti-extrusion and anti-cracking ability. For example, Red Earth and other varieties have crisp and hard pulp, uniform and tight fruit distribution, and good pericarp toughness, so it is resistant to extrusion and is not easy to cause fruit cracking, while Jufeng, ruby and other varieties, their pulp is soft, unevenly distributed and loosely arranged, and the combination between pulp and pericarp is not close, so it is easy to crack fruit.

2. Improper regulation of water.

In the later stage of grape growth, if the fruit is enlarged in a dry climate, and when it is ripe, it will encounter overcast and rainy weather or improper watering, the plant will absorb a large amount of water and transport it to the fruit, speeding up the cell activity and division of the pulp, while the cell activity of the pericarp is slower. This strong contrast will lead to a sharp increase in fruit swelling and pressure, resulting in fruit cracking.

3. Improper fertilization

Grape needs different nutrients during its growth. If fertilization is too single or improper, it will lead to uncoordinated soil nutrients, seriously affect the growth of grapes, weaken the control of planting fertilizer and water, and easily crack when the fruit expands. The specific performance is the blind application of a large number of nitrogen, phosphorus and potassium fertilizer, while ignoring the trace elements of calcium, boron and zinc lamp, resulting in soil nutrient imbalance and affecting growth; there are some farmers excessive application of nitrogen fertilizer, the formation of fruit cracking during the fruit expansion period.

4. Improper pruning

In order to make the plant more branched, increase the number of blossoms and fruits, and excessively prune the branches and leaves, the ability of nutrient synthesis and water conditions of the plant is weakened, resulting in fruit cracking. Generally speaking, 1-2 leaves can be left above the accessory shoot of the ear when pruning. Each normally growing fruit branch should retain more than 25 leaves.

5. Diseases and insect pests

Diseases and insect pests are also one of the main causes of grape fruit cracking, such as thrips, green bug bugs, diseases such as powdery mildew and gray mold, which can cause grape fruit cracking.

6. Improper use of drugs

In the process of grape planting, whether it is pest control or growth regulation, chemicals will be used, these agents will more or less stimulate the grapes, so that the fruit surface injury, to the late growth is very easy to lead to fruit cracking.

The above is the whole cause of grape cracking. I hope it can help you. If you want to know more about grape planting, please follow us.