Farmers grow grapes, grape freezing injury is difficult to manage, resulting in heavy losses to farmers, three ways to reduce the loss

In the northern region, grape frost injury is one of the common natural disasters, which occurs almost every year. In special years, if the winter low temperature comes early, the extreme temperature is too low, the low temperature lasts for a long time or late frost damage, the grape will suffer very serious damage, resulting in great losses.

The freezing injury of grape can be divided into two types: dormant period and growing period.

During the dormant period, the freezing injury of grape mainly occurred in the root and the trunk near the ground, and its obvious symptoms were that the grape branches germinated late or not, sometimes they germinated late or did not germinate, and sometimes the new shoots gradually withered and died soon after sprouting and growing new shoots, while others showed that the upper branches withered and many new branches sprouted near the ground. Cut open the tree trunk near the ground, the phloem turns brown to dark brown, and the cambium is damaged or necrotic.

Grape frost injury

During the growing period, the freezing injury of grape mainly occurred in the growing period of tender shoots, and if a strong low temperature occurred after germination, the tender shoots became dark brown and withered.

The late buried soil or thin buried soil layer after grape off the shelf is the main reason to induce the freezing injury of grape during dormancy period. Too much grape fruit, early defoliation and less nutrient accumulation can aggravate the occurrence of frost injury in dormant period. For young grape trees, too much fertilizer and water, overgrowth of branches and insufficient degree of aging are easy to suffer from grape freezing injury.

Grape frost injury

Solution: 1. The grape adopts the technology of promoting front and back control to promote the ripening of branches and vines: supply nitrogen fertilizer and water before the middle of July, promote the length of branches and leaves, apply more phosphorus and potassium fertilizer after the middle of July, control moisture, pick the heart as early as possible, and promote the ripening of branches.

two。 Increase the accumulation of nutrients in tree storage: such as properly controlling the amount of fruit; timely harvesting to reduce nutrition consumption; strengthening fertilizer and water management after harvest, timely prevention and control of diseases and insect pests, prolonging the functional period of leaf photosynthesis and increasing nutrient accumulation.

High yield of grape

3. Strengthen the preventive measures against low temperature and cold damage: irrigation and foliar spraying are carried out before the arrival of the cold current to prevent and reduce the cold injury through humidification; heating and humidification measures are taken when the cold current comes. After the grape is off the shelf, bury the soil in time to prevent the cold, and appropriately increase the thickness and width of the buried soil to improve the cold protection effect.

The above is the solution to grape frost injury, for reference only, if there is a better solution, you can leave a message in the comments area below.