开角缓势是苹果提早结果的主要途径之一。近几年来,我们发现许多果园为了开张骨干枝角度,常常于冬季修剪时在直立旺长的骨干枝背后进行多道锯伤。由于冬季树体处于休眠状态,生命活力极其缓慢,锯口难以愈合,从而导致锯口间树皮坏死,引起腐烂。我们于1995年4月10 Open-angle easing is one of the main ways Apple early results. In recent years, many orchards have found that many orchards often underwent multiple chains of saws in the back of branches with long branches in winter pruning in order to open the backbone. As the tree is dormant in winter, the vitality of life is extremely slow, the kerf is difficult to heal, resulting in necrosis of the bark between the kerf and causing decay. We were on April 10, 1995