Life cycle and damage caused by A) the Douglas-fir twig weevil, Cylindrocopturus furnissi. B) Adults are approximately 3 mm in size and create small holes (black arrow) to feed in the inner bark of the twig. Females lay eggs (white arrow) under bark cuticles, often behind needle scars. C) Larvae feed within nodes and internodal twig vasculature and pith. D) After pupation, adults emerge, completing the 1-year life cycle. Girdling of twigs causes tip dieback of several Christmas tree species, including noble fir (Abies procera), E) Nordmann fir (A. nordmanniana) and F) Douglas-fir (Psuedotsuga menziesii). Dieback can often be attributed to C. furnissi infestation by locating the exit hole left behind at the node G). Photo credits: Thomas Shahan, Oregon Department of Agriculture (A), Thomas D. Whitney (B–G).