In winter, the management of apple trees cannot be slackened. According to Ma Zhifeng, a professor at Yangling Vocational and Technical College, these parts of apple trees are vulnerable to freezing damage in winter, and management and protection should be strengthened. branch. Twigs and shoots grow late, are immature, and are susceptible to freeze damage and wither and die. From the appearance, the branches have no... In winter, the management of apple trees cannot be slackened. According to Ma Zhifeng, a professor at Yangling Vocational and Technical College, these parts of apple trees are vulnerable to freezing damage in winter, and management and protection should be strengthened. branch. Twigs and shoots grow late, are immature, and are susceptible to freeze damage and wither and die. From the appearance, there is no big change in the branches, but the inside will become dark brown, causing black hearts in severe cases. In this way, the internal storage of frostbitten branches lacks nutrients and grows abnormally, forming branches that resemble leaflet disease, and they will slowly die. Flower buds. The temperature is unstable in the deep winter, and the short-term warming reduces the cold resistance of flower buds. Cold winter or hot and cold temperatures often cause flower buds to freeze damage. Flower bud freeze damage is manifested as internal scale browning, stigma blackening and withering, and the whole flower bud withering and death in severe cases. Root neck. Root neck refers to the junction between the base of the trunk and the root system. The root neck enters dormancy later, and the dormancy is released earlier. Near the surface, lower temperature and weak cold resistance are the main reasons for root neck frost damage. Root neck frost damage is manifested by the blackening of the cortex at the root neck and death, which may occur locally, or form a black ring, which surrounds the stem, and in severe cases, the entire tree will die. Root system. The main reasons for root freezing damage are that the roots below the surface are distributed and floating, the topsoil is too loose or sandy, and the winter is too cold or the cold winter lasts for a long time. Root frost damage is manifested as the outer cortex turns dark brown, the cortex separates from the xylem, and in severe cases, it will completely detach. When the root soil temperature reaches minus 12 degrees Celsius to minus 16 degrees Celsius, the apple root system begins to freeze. Disclaimer: Some articles on this website are transferred from the Internet. If the legal rights of a third party are involved, please inform this website for processing. phone Dome Cameras,Bus Hd Internal Camera,Car Hd Surveillance Camera,Vehicle Hd Internal Camera Vsstech Co.,Ltd. , https://www.vsstechcctvsystem.com