由于北方地区冬季寒冷,因此每年冬季不少果树受到不同程度的冻害。经调查,在梨树各品种中都有花芽受冻,但对产量无大影响;在桃树中以久保为主的品种受冻较轻,苹果桃受冻较重;在苹果树中各个品种受冻都较重,对产量影响很大。冻害来得早会引起果树树体衰弱, Due to the cold winter in the northern part of the country, many winter trees are subject to varying degrees of frost damage each winter. After investigation, in the pear varieties have flower buds in the cold, but no significant impact on yield; in the peach tree to Kubo-based varieties of cold less severe peach frozen heavier; in apple trees in all varieties Frozen are heavier, a great impact on the yield. Early frost damage will cause fruit tree body weakness,