After all the fruits are picked, the long branches with pencil thickness are generally pruned. The pruning time is determined in early and middle September. Because this period happens to be the dormant period of peach trees, their physiological activities are also at a low ebb, and pruning long branches will not affect the normal growth of main branches. Moreover, the flower buds of stone fruit trees are still growing during dormancy. In order to reduce the loss of nutrition and the influence on the growth of flower buds, according to the test results of Japanese Yamanashi Nagazawa Baifeng variety, September is the most suitable time to prune long branches.

2. Prune tree types

Generally, fruit tree types are classified and pruned according to "apple tree type", "grape tree type" and "peach tree type". Take the peach tree as an example, it has the characteristics of flowering first and then growing leaves. The cultivation cycle in the same place is one week earlier than other fruit trees, and it is also a tree species with strong nutritional storage capacity. The growth cycle of flowering, fruiting and harvesting is short, only 60 ~ 70 days. The advantage of pruning in autumn is to prune the overgrown branches and make them into fruiting branches, thus promoting the nutrient circulation of the whole tree, reducing fruit cracking and physiological fruit drop, and improving the quality and yield of fruits.

3, the key to pruning

At present, lateral branches are often shaped into Y-shaped fruit branches, but in recent years, a pruning technique has been developed which is beneficial to stabilize the young trees and is also suitable for the traditional happy tree form.

What needs to be emphasized here is that the pruning technology introduced in this paper is generally suitable for trees with strong growth potential and strong long branches. On the contrary, it is not suitable for trees that are weak and endangered by pests (such as spider mites and leaf miners). The above pruning methods of long branches in autumn can not only improve the fruit setting rate of peach trees, but also be suitable for fruit tree varieties such as plums, cherries and apricots.