A Detailed Explanation of the Causes of Grape Bleeding and Its Prevention and Control Methods

Grapes commonly exhibit bleeding in spring. It mainly involves sap flowing out from wounds, causing a large loss of nutrients. In mild cases, yields are reduced; in severe cases, the entire plant dies. So what causes bleeding? How should it be handled? Let's take a look at the detailed introduction.

I. Causes of Bleeding

Bleeding in grapes in spring is a common phenomenon. Generally, when the soil temperature reaches 6-10 degrees, the grape root system begins to become active, and the sap and nutrients of the tree are transported along the xylem to various parts of the tree. If a wound is encountered during transport, they will flow out along it, and in severe cases they will drip like raindrops, which is extremely detrimental to the growth and development of grapes and requires timely prevention and control.

II. Prevention and Control Measures

1. Proper pruning

Pruning of canes should not be too early or too late. If too early, the tree's nutrients will not have returned to place, causing waste; if too late, the bleeding period will arrive, and a large amount of nutrients will flow out with the wounds, leading to excessive consumption of nutrients. The best pruning time is generally 3-4 weeks after leaf fall, specifically between early December and the end of December, and after pruning, attention should also be paid to protecting the wounds so that they heal as quickly as possible.

2. Protect the wounds

To prevent bleeding, the best method is to protect the wounds. After pruning, white latex or pruning seal oil mixed with lime sulfur residue can be applied to the wounds. This is convenient and quick, and has low cost and good results.

3. Improve tree resistance

Water and fertilize in time in spring to improve the tree's cold resistance. Generally, irrigation is given to the plants in combination with fertilization, applying 0.25 kg of ternary compound fertilizer per plant, mainly potassium fertilizer, along with a small amount of biological bacterial fertilizer and trace elements, which can effectively improve the plant's resistance and prevent a large number of wounds caused by freezing damage.

4. Thoroughly clean the orchard

In winter, thorough orchard cleaning work should be carried out. First, clear away the weeds completely, then gather and burn the residual branches, fallen leaves and weeds in the orchard, and manually scrape off insect eggs on the canes to reduce sources of pests and diseases, so as to prevent wounds caused by pests and diseases that lead to bleeding.

The above is an introduction to the causes of grape bleeding and its prevention and control methods. We hope it can help you. If you want to learn more related knowledge, please stay tuned to us.