The present invention without the need for special tasks such as winding of the coating or rice straw, trees to provide irrigation prevention material that can be widely applied. The invention relates to wound around the trees 101 mounted a cold damage prevention material 11 to prevent irrigation of trees, includes a bag body, and plant biomass 41 that is filled in the internal space of the bag body irrigation is the prevention material. A first sheet of strip facing the surface of the tree, the second sheet and the inner surface and the inner surface of both belt-like continuous direction of the second sheet of the first sheet of the strip that forms the inner space between the first sheet The result comprises a top joint portion to be joined, and a lower bonding portion which the inner surface of the first sheet and an inner surface of the second sheet is joined apart the upper joint along the continuous direction of both band and along, the internal space defined by the first sheet inner surface and the second sheet inner face between the upper joint and lower joint.BACKGROUND 6【課題】塗布や稲わらの巻付けなどの特殊な作業を要することなく、樹木に幅広く適用することができる寒害防止材を提供する。【解決手段】樹木101に巻き付けて装着し樹木の寒害を防止する寒害防止材11であって、袋体と、袋体の内部空間に充填された植物バイオマス41と、を備える寒害防止材である。樹木の表面に面する帯状の第1シートと、第1シートとの間に内部空間を形成する帯状の第2シートと、第1シートの内面と第2シートの内面とを両帯状の連続方向に沿って接合する上接合部と、第1シートの内面と第2シートの内面とを両帯状の連続方向に沿って上接合部と離れて接合する下接合部と、を有してなり、上接合部と下接合部との間の第1シート内面及び第2シート内面によって内部空間が規定される。【選択図】図6
