果树冻害是北方果树生产中的主要灾害之一,果树受冻后轻者造成抽干、减产,严重时会导致大量死亡,特别是早春倒春寒常给果农造成严重的经济损失。因此,加强果树的科学管理,对预防果树的冻害具有十分重要的意义。一、冻害症状及发生原因 1.症状果树主干地表以上主枝分权部分以下,树皮大面积发黑或者环状发黑,变色部位深达形成层,部分主枝背上和背下树皮也有变色和组织坏死现 Fruit tree frost damage is one of the major disasters in the production of northern fruit trees. If the fruit trees are cold, they are drained, reduced and severely killed. In particular, early spring usually causes serious economic losses to farmers. Therefore, to strengthen the scientific management of fruit trees is very important to prevent frost damage of fruit trees. First, the cold damage symptoms and causes 1. Symptoms above the trunk of the main tree branches above the main branch decentralization, large bark black or ring-shaped black, discoloration part of the deep formation, part of the main branch of the back and bark There are discolorations and tissue necrosis now