Abstract
The thermal reaction of the adult sugi bark borer, Semanotus japonicus LACORDAIRE (Coleptera : Cerambycidae) was investigated in the laboratory. The temperature range was 7.9°C to 29.1°C for normal activity, and above 12.3°C for active movement. The rates of movement and distances traversed by adults in a cedar stand correlated with the percentages of time above 12.3°C within a day. This suggested that adults which emerged in the early season of the year were not able to move activity because of low temperatures.
