Wood discs cut from 23-year-old lodgepole pine (PinuscontortaDougl. var.lalifoliaEngelm.) stems were analyzed for vertical and radial resin duct densities adjacent to basal injuries caused by the weevil,HylobiuswarreniWood. The injury from single attacks continued for at least 2 years and was characterized by reduced radial growth and an abundance of vertical 'traumatic' resin ducts above the wounds. No increase in radial duct density was detected above the wounds.