The present invention provides a method for protecting living plants from harmful insects by using a sheetlike structure impregnated with an insecticide to cover the surface of the trunk, pseudotrunk, branch, root ball and/or root region of the plant. Additionally provided are living plants whose trunk, pseudotrunk, branch, root ball and/or root region surface is covered with a sheetlike structure impregnated with an insecticide. The invention also relates to a rectangular sheetlike structure impregnated with an insecticide and comprising a fastening means which, following tubular coverage of the surface of trunk, pseudotrunk or branch of a plant, allows a permanent hold thereto. It further relates to a sheetlike structure impregnated with an insecticide, in the form of a perforated sheet which has a continuous interruption between the outer and inner edges. Lastly, it also relates to the use of the sheetlike structure for protecting living plants from harmful insects.本發明提供一種藉由利用經殺蟲劑浸漬之片狀結構以覆蓋植物主幹、假幹、枝、根團及/或根域之表面以保護活體植物免受害蟲危害的方法。另提供主幹、假幹、枝、根團及/或根域表面覆蓋有經殺蟲劑浸漬之片狀結構之活體植物。本發明亦係關於經殺蟲劑浸漬並包括在呈管狀覆蓋植物主幹、假幹或枝表面後可以永久固持之固定構件之矩形片狀結構。其進一步係關於經殺蟲劑浸漬的片狀結構,其呈外邊緣與內邊緣間具有持續中斷之帶孔片形式。最後,其亦係關於該片狀結構於保護活體植物免受害蟲危害的用途。