我省栽培的果树种类品种较多,但其抗寒性能各不相同。因此,冬季常有不同程度的冻害发生,以致于形成周期性或区域性冻害。果树受冻后,轻者树势衰弱,产量下降,不仅加大了小年产量幅度,而且易招致病虫危害,造成病害(腐烂病)、冻害恶性循环。果树是多年生作物,受冻后不仅影响当年的产量,也影响以后几年的生长和结果;受冻严重全株死亡。果树发生冻害的原因是极其复杂的。这种复杂性首先在于种类、品种、甚至在同一植株上由于部位不同,时期不同对寒冷和不利越冬条件的忍耐力都是不同的。因此,探索 There are more varieties of fruit trees cultivated in our province, but their cold-resistant properties are different. Therefore, different degrees of frost damage often occur in winter, resulting in the formation of periodic or regional frost damage. After the fruit trees are frozen, the light tree shrunken and the yield dropped, which not only increased the rate of small annual output, but also easily led to pests and diseases, resulting in a vicious cycle of disease (rot disease) and frost damage. Fruit trees are perennial crops, not only affect the current year’s output after the freeze, but also affect the growth and results of the next few years; severely frozen whole plant died. The cause of freezing injury in fruit trees is extremely complicated. This complexity lies, first of all, in species, variety, even in the same plant due to different parts, different periods of endurance for cold and unfavorable winter conditions are different. So explore