Abstract
In a Japanese red pine stand which was heavily damaged by the pine wilt disease, the biology of subcortical insects in pine bait logs was examined by restricting their attacks to certain periods using artificial treatments. Three species of Curculionidae, Shirahoshizo spp. (including S. poni, S. insidiosus and S. rufescens), Pissodes nitidus and P. obscurus, two species of Cerambycidae, Monochamus alternatus and Acanthosinus griseus and a number of Scolytidae, Taenioglyptes fulvus and Tomicus piniperda etc. emerged from the logs. The seasonal changes in emergence were observed, and the differences in emergence density among the treatments were discussed for each species in relation to the oviposition periods.
