放任生长的成龄山楂大树,一般表现为骨干枝多轮生互相重叠,枝头转弱,树势下降,树冠内秃外密,顶部容易焦梢,生长和结果失调,花开满树而座果不多。因此,对这类型的树体必须进行改造,做到大枝稀留,小枝密留,骨干枝上的枝条宜安排两侧,枝不压枝,叶不压叶,引光入膛,使之立体结果。具体修剪措施,宜采用疏间、回缩、短截、培养相结合的方法。 Larvae of mature age-old hawthorn are generally allowed to grow, and their branches are often overlapped with many turns of rotation. The branches are weakened and the shrubs fall. The branches of the canopy are densely covered with branches and branches. Not many fruits. Therefore, this type of tree must be reformed, so that large branches, branchlets stay, the branches of the branches should be arranged on both sides of the branches, the branches do not pressure branches, leaf leaves without pressure, lead into the breech, so that the three-dimensional result. Specific pruning measures should be used sparse, retraction, short cut, a combination of training methods.