Dispersal of the Spruce Beetle, 'Dendroctonus rufipennis', and the EngraverBeetle, 'Ips perturbatus', in Alaska

摘要

Mark-release-recapture experiments were performed with spruce beetles(Dendroctonus rufipennis (Kirby)) and Ips engraver beetles (Ips perturbatus (Eichhoff)) to determine distance and direction of dispersal. The recapture rate of beetles marked with fluorescent powder was extremely low. Most I. perturbatus beetles dispersed up to 30 m from their overwintering sites compared to most D. rufipennis, which dispersed from 90 to 300 m. Ips perturbatus beetles were caught up to 90 m and D. rufipennis up to 600 m from the point of release.