New shoots, annual branches, perennial branches and annual branches with leaves are called new shoots. Due to the different seasons of new shoots, they can be divided into spring shoots and autumn shoots. Spring buds are spring buds and autumn buds are autumn buds. The spring shoot tissue is rich and robust, which is beneficial to flower bearing and flower bud differentiation in the next year. Autumn shoots have poor tissue, poor cold resistance and weak flower-forming ability, but in some years and varieties, autumn shoots may also form flower buds. Therefore, technical measures are taken to promote spring shoots and control autumn shoots in production. In plastic pruning, in order to inhibit the vigorous growth of trees and promote them to grow short branches, pruning is often carried out at the bud at the junction of spring shoots and autumn shoots, that is, "capping" pruning.