Abstract
Monitoring and sampling of adult populations of the sugi bark borer, Semanotus japonicus LACORDAIRE, which attacks the trunks of Japanese cedar and cypress were described using the sticky trap banding method. High correlations were observed between the numbers of collected adults and emergence holes from caged logs and cedar stands. To determine sample size for the estimation of the mean density, the spatial distribution pattern of collected adults per tree was analyzed by the m-m regression method. The distribution of collected adults was contagious. Based on this result, the diagram which determines the sample size required to estimate the mean density with a desired precision and the density estimation method using a frequency index (proportion of bandages containing one or more individuals) were discussed.
