本地果农为了促进新红星苹果幼树提早成花与结果,常进行主干环割,结果发生环割处腐烂而导致死树现象。经笔者对1800株树调查看出,凡是5月下旬主干环割的新红星幼树,遇1次大雨或1次喷药后,环割处容易发生腐烂现象,一般成龄树重于幼龄树,皮部厚的树重于皮部薄的树,3圈环割树重于2圈环割树,2圈环割树重于1圈环割树等。其原因是新红星主干环割刀口愈合能力弱、且皮部易翘起,遇大雨或喷农药后,雨水或药水顺树干下流侵入伤口,使之更难愈合,以致腐烂病病菌侵入伤口死亡组织蔓延腐烂,如不及时采取措施,就会造成死树。其防治对策是: In order to promote the early flowering and fruiting of the apple tree of New Star apple, the local fruit growers often carry out the trunk circumcision, resulting in the decay of the circumcision and the dead tree phenomenon. 1800 by the author of the survey found that all trees in late May, the main ring cut the new red star saplings, a rain or a spray, the ring cutting Department prone to decay phenomenon, the general aging tree heavier than young Trees, leather thick trees heavier than the skin of the tree thin, 3 rings cut the tree heavier than 2 rings ring cut trees, 2 rings cut the tree heavier than 1 ring ring cut trees. The reason is that the new Red Star trunk ring cutting edge healing ability is weak, and easy to tilt the skin, in case of heavy rain or spray pesticides, rain or syrup trunk downflow into the wound, making it more difficult to heal, so that the pathogen invade the wound dead tissue Rotten decay, if not promptly taken measures, it will result in dead trees. The prevention and treatment measures are: