萌芽开花较早的核果类果树如桃、梅、李、杏以及仁果类果树苹果、梨等,花期易遭受春末发生的晚霜危害.严重年份可造成大幅度减产,甚至绝收.如1992年部分地区的晚霜危害,造成水果减产70%左右.因此,果树花期应注意预防霜冻的危害.预防措施有: Flowering is vulnerable to the late frost that occurs in the late spring, which can result in drastic reduction in production or even failure in the serious year, as in the early flowering of the stone fruit trees such as peach, plum, plum, apricot and pome fruit trees such as apple and pear. In some areas the night frost damage, resulting in about 70% reduction in fruit Therefore, fruit trees should pay attention to the risk of frost prevention precautionary measures are: