果树的老皮是病菌虫卵的主要越冬场所之一。常有大量的病菌及虫体在此越冬繁殖,成为第二年害虫的主要来源,对果树的产量和质量形成很大的威胁,使产量和质量的提高受到制约。同时在果树的不断生长发育过程中,其外表粗皮在不断地增厚,由于粗皮缺乏延展性而束缚树体的加粗生长,所 The old skin of a fruit tree is one of the major wintering places for bug germs. There are often a large number of germs and parasites in this winter breeding, becoming the main source of pests in the second year, the production of fruit trees and the formation of a great threat to the quality and yield to be restricted. At the same time in the continuous growth and development of fruit trees, the appearance of the bark is constantly thickening, due to the lack of ductility of the bark and constraining the thick growth of the tree,