Second, control the canopy. The main branches that are too low within 50 to 80 meters from the ground should be pulled out year by year. For weak trees and aging fruit trees, the big lateral branches should be thinned first to make the big trees smaller and gradually improved according to the situation. If the crown is too high, you must bow your head and open the light path. It is necessary to select good branchlets, control the crown at the weak branches, increase the upper load, and press the crown with fruit. There are four changes in the re-election of crowns: large to small, round to flat, high to low, dense to fine. Remember the principles of removing the weak and retaining the strong, removing the big and retaining the small, removing the dense and retaining the thin, removing the coarse and retaining the fine, and removing the low and retaining the high. At the same time, it is necessary to slowly pull branches and change directions, and cultivate oblique, uniaxial and drooping. Cultivate loose fruiting branches and don't prune them at will.
Third, the wound can be closed by sticking the calluses antiseptic film in time, which can heal quickly. Anti-freezing, anti-virus invasion, anti-rot disease spread, anti-wintering pest habitat and reproduction, anti-rain and water pollution, anti-large area wound cracking. Shape change will cause many big wounds. If it is not protected in time, it will weaken the advantages of trees and cause branch diseases such as rot.