Abstract
Triadica sebifera has already invaded the Forest of Takaragaike Park and logging activities have started, but it is necessary to promote the control activities systematically. We investigated the distribution of T. sebifera in the forest and surrounding area. We suggested areas with high priority to control based on the density of individuals with high possibility of seed production. The distance from fruiting individuals maximizes the distribution probability of T. sebifera, and the tree gaps in the valley were considered suitable for invasion. Using scenario analysis, we identified trees that can be cut down to lower the distribution probability in the forest.