How to deal with Frost injury of Apple trees

Apple is a kind of fruit that everyone likes very much, and the market demand in our country is very great. Therefore, there are still a lot of people planting in our country, when planting geese of apple trees, we often encounter a lot of problems affecting the growth and yield of apple trees. Especially in winter, apple trees are very prone to frost damage. So what should we do about the freezing injury of apple trees? The following editor will give you a brief introduction, let's have a look!

1. Causes of frost injury

Different growth parts of apple trees have different growth habits, so the causes of freezing injury of apple trees are also different. When the branches of apple trees are frozen, the sudden drop in temperature and soil leads to rapid cooling and shrinkage of the bark of the branches, causing the trunk to crack from outside to inside, which usually leads to cracking at night. Usually when the temperature drops to minus 10 degrees, the branches are prone to frost damage, and then the whole tree will freeze to death. The reason for the frost injury of the root neck of the apple tree is that the root neck is the latest part of the whole tree to enter the dormancy period, and the time to release the dormancy is also the earliest, so if the temperature drops suddenly, the surface temperature will begin to change a lot, which is very easy to freeze.

The cold resistance of flower buds of apple trees is very weak, and the better the flower bud differentiation is, the worse the frost resistance will be. Especially in the deep winter season, the temperature is very unstable, if the temperature rises for a short time, it will cause the cold resistance of flowers and leaves to decline. If the temperature changes too frequently, it is easy to cause flower bud freezing injury. For example, in early spring, the time for flower buds to release dormancy is relatively early, if there is a cold phenomenon in late spring, it will be frozen.

2. prevention and control measures

In the apple tree growth period, but at any time, it is necessary to ensure the stable growth of the tree. In case of drought, water should be properly watered, and waterlogging should be drained in time. Remove the overgrown branches, improve the permeability, ensure the normal growth of leaves, and enhance the cold resistance of apple trees. Then in spring and summer, the trunk should be painted white, which can effectively play the role of anti-freezing. Then do a good job of fertilization to provide adequate nutrition for fruit trees. Phosphorus and potassium fertilizer is the main fertilizer in summer and autumn, and organic fertilizer is the main fertilizer in autumn.

After freezing, apple trees should pay attention to cutting off the frozen branches in time. For the saying that the trunk of the main branch is frozen, it is necessary to truncate the hidden bud sprouting branch in the place of full bud to promote the branch. Then cultivate all levels of backbone branches, fruit trees should be often cut short within three years, control the amount of fruit, and increase the number of branches. If the freezing injury is relatively mild, the main side branches and some permanent auxiliary branches should be cut short at the full buds to promote the tree to restore growth as soon as possible.

The above is a brief introduction to what to do about the freezing injury of apple trees. That's all for today's introduction. This article is for reference only. I hope it can help you all.