放任生长的成龄山楂树,修剪时应调节好各级骨干枝的关系,使生长和结果达到平衡。据作者多年的经验,对这类山楂树具体的修剪措施,可概括为“七疏、五缩、两截、一培养”。1.七疏一是疏除干枯枝和病虫枝。结合修剪,首选要清除干枯的死亡枝和病虫枝,并集中烧毁。二是疏间骨干轮生 Allow the growth of mature hawthorn, trim should be good at all levels of the backbone of the relationship between the growth and the results to strike a balance. According to the author’s many years of experience, the concrete pruning measures for such hawthorn trees can be summarized as “seven sparse, five or two, one cultivation.” 1. Seven sparse one is to eliminate dry branches and pest branches. Combined with pruning, the preferred removal of dead dead branches and pest branches, and concentrated burned. The second is sparse backbone rotation