What should I do if the temperature drops suddenly and the grapes suffer from freezing damage?

The sudden drop of temperature in grape planting sometimes surprises growers, but the weather forecast is also an important reference. As a grape grower, we must grasp the real-time changes of the weather and take precautions before the arrival of cold air. People often say, "Believe it or not", so we must believe the weather forecast.

If it is too late to take preventive measures, so that the vines suffer from freezing damage, we should take corresponding remedial measures according to their specific conditions, and strive to minimize the losses.

Symptoms and causes of freezing injury of grapevines: In winter, grapevines are dormant and encounter extremely cold weather, resulting in freezing injury of grapevines. Symptoms are not obvious at first, but in spring, vines generally do not germinate when they germinate, or new branches have yellow leaves and die after germination. At this time, the bark of the vine root is cut open, and brown or even black-brown necrosis can be seen. Freezing injury of grapevines in growing period: Freezing injury occurs in the growing period of grapevines, usually after the grapevines germinate in spring, when the new buds just grow. Weather like "late spring cold" will cause freezing injury to the buds and twigs of grapevines, making them turn brown and die. Preventive measures of grape freezing injury

Enhance the cold resistance of grapevines: The freezing injury of grapevines in winter is often related to the large number of fruits, the late harvest time and the insufficient nutritional reserves of grapevines after loading. Therefore, the vines should be loaded reasonably, harvested on time or in advance as far as possible, and then fertilized in time to supplement nutrients for the vines and improve their cold resistance.

Sealing soil or digging ditches for burial: The deeper the soil layer at the roots of lianas, the better their cold resistance. Therefore, before winter comes, soil can be taken from the ground to seal the roots of vines, so as to increase the thickness and width of the soil layer and enhance the cold resistance. Secondly, vines can be buried under the soil by digging ditches to improve their cold resistance.

Strengthen the defense against cold air: pay attention to weather forecast and weather changes. Before the cold current comes, the vines can be watered once in time to increase the humidity of the vineyard, and the method of humidification and cold protection can be used to reduce the occurrence of freezing injury. Secondly, the traditional way of ignition and smoking was adopted to smoke after the arrival of cold air, so as to quickly raise the temperature in the vineyard.

Remedial methods of grape after freezing injury

Pruning: When the grapevine is frozen, some main buds of the grapevine will be frozen, and usually the remaining secondary branches will develop into branches. At this time, it is necessary to take coring treatment in time to promote the early results of secondary branches. Cut off the branches that have been frozen, and re-cultivate the nearby branches into fruiting mother branches to reduce the bare zone.

Cluster to promote germination: if the freezing injury is serious, you can also cut off some branches to promote the germination of new buds and sprout branches for grafting.

Pressing branches and urging roots to promote the growth of new roots: If the root system of the vine is frozen, if it is not too serious, pressing branches and urging roots can be used to promote the germination of new roots. After the vines germinate, measures such as supplementing organic fertilizer and spraying amino acids should be taken to enhance the nutrition of the trees and promote their effective recovery.

Cutting off roots to promote germination: If vines are severely damaged by freezing and other remedial measures have little effect, roots can be cut off to improve their germination. If it is serious enough to cause the whole vine to die, there is no point in remedy.