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Abstract
Phytophthora ramorum is well established over approximately 450 km of forests along the California coast. In the course of research on this emerging pathogen, two other aerial species of
Phytophthora,
P. nemorosa and
P. pseudosyringae, were discovered. Little is known about the ecology and biology of these other species and how they interact with
P. ramorum. Preliminary research has found that
P. nemorosa and
P. pseudosyringae have similar host and geographic ranges and cause similar disease symptoms as
P. ramorum. However,
P. nemorosa and
P. pseudosyringae do not appear to cause landscape level mortality of oaks (
Quercus spp.) or tanoak (
Lithocarpus densiflorus), as does
P. ramorum. These three species are virtually indistinguishable in the field and can only be identified microscopically.
Parent Publication
Citation
Murphy, Shannon K.; Rizzo, David M. 2006. Incidence of
Phytophthora ramorum,
P. nemorosa and
P. pseudosyringae in three coastal California forest communities. In: Frankel, Susan J.; Shea, Patrick J.; and Haverty, Michael I., tech. coords. Proceedings of the sudden oak death second science symposium: the state of our knowledge. Gen. Tech. Rep. PSW-GTR-196. Albany, CA: Pacific Southwest Research Station, Forest Service, U.S. Department of Agriculture: 69-71
