Hansen, E., Reeser, P., Sutton, W., and Sims, L. 2012. Host and habitat index for Phytophthora species in Oregon. Forest Phytophthoras 2(1). doi: 10.5399/osu/fp.2.1.3026
A total of 29 Phytophthora species were identified from the various environments in forests. Fourteen species came from trees or forest shrubs growing in cultivated and urban environments. Only three species were unique to the latter, however, including P. ilicis, from cultivated holly (Ilex), and P. sansomeana and P. taxon ceanothus from forest nurseries. Three species, P. gonapodyides, P. taxon oaksoil, and P. taxon salixsoil were recovered from streams in all surveyed counties. The most widespread species causing root disease or bole cankers of trees was P. lateralis on Port-Orford-cedar in landscape plantings throughout the state as well as on forest trees in its limited native range. P. cambivora and P. cinnamomi were widespread but uncommon on a number of forest trees.