Abstract
Supports (braces) are attached when roadside trees are planted, but leaving them attached for a long time may result in damage to tree trunks. This report is a survey of the types of supports used, and damage caused by the supports, for roadside trees planted around Shibuya station in Tokyo. This report reviews the purposes of the different types of supports and the best timing for the removal of supports, including observations on the use of supports overseas. This survey found that half of the roadside trees in the surveyed area had supports, but their quality and form varied considerably. We judged that supports had no effect in about 54% of the cases, and they harmed the trees in about 39% of the cases. Documentation of procedures did not clearly specify when supports should be removed. We recommend that further study be given to the use of tree supports.
