桃、杏、梨、苹果等果树,一般是在春天开花。但有的年份会在秋天又开一次花,成为二次开花,这是什么缘故呢?原来果树在正常生长情况下,随着春天开花出叶,同时还要形成次年的花芽和叶芽。如果当年由于管理不好,受红蜘蛛、蚜虫、食叶害虫等的为害,或者天气干旱,促使果树叶片过早脱落(8月以前),而当时气温仍高,果树的生命活动仍然旺盛,使休眠的花芽和叶芽在当年还要开放,因而有二次开花的现象。也有一些树木花芽形成早,枝条封顶早,当 Peach, apricot, pear, apple and other fruit trees, usually flowering in spring. However, in some years, flowers once again bloom in the autumn and become the second bloom. What is the reason? In the normal growth of the fruit tree, the flowers and leaves buds of the following year are formed along with the spring blossom. If the current year due to poor management, by the red spider, aphids, leafy insects and other damage, or the weather was dry, prompting premature leaf shedding (before August), when the temperature was still high, the life activity of fruit trees is still strong, so that Dormant flower buds and leaf buds in the current year but also open, and thus the phenomenon of secondary flowering. There are also some trees that flower buds form early, with branches capped early when