The temperature has dropped rapidly over the past few days, and as the temperature gradually declines, there may be frost or rain and snow soon. For fruit trees, in this case of sudden temperature drop, in the case of freezing, it is vulnerable to freezing damage. Then, what are the causes of freezing damage in fruit trees and what are the symptoms of freezing in various parts? Is there a good preventive measure? Let’s explain it to Xiaobian. First, the cause of freezing damage to fruit trees The reason for the freezing damage of fruit trees is mainly due to the low temperature, cold wind, drought in the winter and the cold spring in the spring, which causes the fruit trees to freeze. Second, fruit trees freeze damage to various parts of the symptoms 1. Fruit branches are frozen: mainly some twigs that grow late and are immature. Because the tissues are not full, the protective tissues are underdeveloped, and they are most vulnerable to freezing damage and die. Some branches did not change from the outside, but the germination was late, the leaves were thin or deformed, and the color of the xylem was browned, and then the black heart was formed, which was also a frost damage. 2, the main stem of the fruit is frozen: mainly the cortex becomes black and dead, but the light occurs locally, but the black ring is surrounded by the black ring, causing the death of the whole tree. 3. The roots of the fruit trees are frozen: For the roots of the fruit trees, although they are grown underground, the freezing damage is not easy to be found, but the impact on the aboveground parts is very significant. It is characterized by late or irregular germination in spring, or dry shrinkage after leafing. After cutting out the root system, it can be found that the outer cortex becomes brown, and the cortex is separated from the xylem and even falls off. 4. The flower buds of the fruit trees are frozen: the flower buds are mostly frozen in the early spring. At this time, the flower buds are released from dormancy early. When the temperature rises and starts to germinate, and the frost occurs, the freezing damage occurs, which is characterized by browning of the flower buds and slow development of the flower buds. Or deformity, affecting pollination and results, in severe cases, flower buds die and shrink. Third, fruit tree freeze damage prevention measures 1. Wrap straw in the fruit tree: Before the cold weather comes, use straw or straw to wrap it around the trunk or main branch. 2. The trunk of the fruit tree is white: after the leaves of the fruit tree are smeared with whitening agent, the trunk and main branches of the fruit tree are evenly painted white, so that the temperature of the tree body changes stably, which is both antifreeze and insecticide. 3, orchard smoked: generally in the evening before the onset of low temperature cold wave, with broken firewood, broken weeds as fuel, the temperature drops to the critical temperature of the fruit tree when frozen, and control the smoke to cover the smoke in the orchard Space. 4, the drug is cold: according to the weather forecast, the fruit trees are sprayed before the low temperature comes.
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