Vertical Distribution of Adult Emergence Holes of the Sugi Bark Borer, Semanotus japonicus (LACORDAIRE) (Coleoptera, Cerambycidae), on Japanese Cedar Trees

The vertical distribution of emergence holes of Semanotus japonicus adults on Japanese cedar trees was investigated, and the proportions of emergence holes existing within varying height range from the ground were estimated. Emergence holes decreased in number at the height levels of over 6 meters and were not found at the levels higher than 9 m. Emergence holes on the trees with heavier infestation tended to be distributed more evenly towards higher parts of the trunk. A method for estimating the total number of emergence holes on a tree using the proportion of holes existing below 2 m above the ground was presented.