PROBLEM TO BE SOLVED: To provide a biodegradable protective material for trees that has excellent workability in winding and re-winding and also has excellent visibility and strength.SOLUTION: A protective material for trees is wound around a tree to protect it from peeling damage. The protective material contains a resin composition mainly composed of a polylactic acid resin (A) and has a light transmittance of 40% or less in wavelengths of 240 nm or more and 800 nm or less.SELECTED DRAWING: NoneCOPYRIGHT: (C)2018,JPO&INPIT【課題】巻付け及び巻直し時の作業性に優れると共に、視認性及び強度に優れた生分解性の樹木用保護材を提供する。【解決手段】樹木用保護材は、樹木に巻付けることによって樹木の剥皮被害を防止する樹木用保護材であって、ポリ乳酸系樹脂(A)を主成分とする樹脂組成物を含有し、波長240nm以上800nm以下の範囲における光線透過率が40%以下である。【選択図】なし