PROBLEM TO BE SOLVED: To provide an insect pest repellent film to be wound around a tree, capable of protecting a tree before withering, excellent in the workability at the time of use, to be hardly torn with a projecting object, and capable of omitting human-made recovery after use and a method for using the same.SOLUTION: The biodegradable film is configured so that polybutylene adipate terephthalate is contained as a composing resin, that the peel strength in self-bonding is at least 0.04 N/2.5 cm, that the ratio of the tensile elongation in the longitudinal direction to the tensile elongation in the lateral direction (the tensile elongation in the longitudinal direction (%)/the tensile elongation in the lateral direction (%)) is not more than 0.3, and that the tensile elongation in the lateral direction is at least 500%. In the method for using the film, the insect pest repellent biodegradable film to be wound around a tree is wound around a trunk of the tree and/or from a root exposed to the ground surface to the trunk till at least a double overlapping part is formed with the longitudinal direction as the winding direction.COPYRIGHT: (C)2012,JPO&INPIT【課題】枯死する前の樹木の保護を可能とし、使用時の作業性に優れ、且つ、突起物に対する破れが生じ難く、さらに使用後の人為的回収が省略可能な、樹木巻きつけ用害虫防止フィルム及びその使用方法を提供する。【解決手段】構成樹脂としてポリブチレンアジペートテレフタレートを含み、自己貼り合わせにおける剥離強度が0.04N/2.5cm以上であり、幅方向の引張伸びに対する長手方向の引張伸びの比率(長手方向の引張伸び(%)/幅方向の引張伸び(%))が0.3以下であり、且つ、幅方向の引張伸びが、500%以上となるよう生分解性フィルムを構成し、また、上記フィルムの使用方法においては、樹木巻きつけ用害虫防止生分解性フィルムを、長手方向を巻きつけ方向として、二重以上の重なり部分が形成されるまで樹木の幹および/または地表に露出する根から幹にかけて巻きつける。【選択図】図1
