The major part of summer pruning is the upper half of crowns of apple trees.
夏季修剪的主要部位是树冠的上半部。
Pruning should not be performed in late summer or early spring, however any other time of the year is fine.
修剪不能在早春或夏末进行，在一年中的其它时间都可以。
Measures for protection to frost are proposed, including selecting favorable topography and frost-resistant cultivars, smoking and summer pruning.
提出预防霜冻的措施，主要包括：选择有利地形、选择抗霜冻品种、采取熏烟和夏季修剪等措施。
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