Intertaxon relationships
species
Douglas-fir
Pseudotsuga menziesii (Mirb.) Franco
Heterobasidion annosum (Fr.) Bref. - Fomes Root Rot 
Arhopalus productus (LeConte, 1850) - New House Borer
Dicentrus bluthneri LeConte, 1880
Eburilla sericea (White, 1855)
Etorofus obliteratus (Haldeman, 1847)
Leptoglossus occidentalis Heidemann, 1910 - Western Conifer Seed Bug
Megasemum asperum (LeConte, 1854)
Opsimus quadrilineatus Mannerheim, 1843 - Spruce Limb Borer
Phymatodes aeneus LeConte, 1854
Phymatodes dimidiatus (Kirby, 1837)
Poliaenus oregonus (LeConte, 1861)
Prionoplus reticularis White, 1843 - Huhu Beetle
Prionus californicus Motschulsky, 1845 - California Root Borer
Semanotus litigiosus (Casey, 1891)
Stenepotes pallidus Pascoe, 1875
Tetropium velutinum LeConte, 1869
Ulochaetes leoninus LeConte, 1854
Xylotrechus lengi Schaeffer, 1908
Xylotrechus undulatus (Say, 1824) - Spruce Zebra Beetle
consumer (larval stage only)
Monochamus notatus (Drury, 1773) - Northeastern Pine Sawyer