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Development of Phytophthora ramorum infection and disease symptoms on coast redwood seedlingsAuthor(s): Sunny Lucas; Jennifer L. Parke; Yana Valachovic
Source: In: Frankel, Susan J.; Kliejunas, John T.; Palmieri, Katharine M., tech. coords. 2008. Proceedings of the sudden oak death third science symposium. Gen. Tech. Rep. PSW-GTR-214. Albany, CA: U.S. Department of Agriculture, Forest Service, Pacific Southwest Research Station. p. 397
Publication Series: General Technical Report (GTR)
Station: Pacific Southwest Research Station
PDF: View PDF (136 KB)
DescriptionCoast redwood (Sequoia sempervirens) is a host for Phytophthora ramorum but it is not clear if the pathogen represents a significant disease risk to this tree species. In an on-going field experiment, we are examining the process of infection and the development of symptoms on coast edwood seedlings in naturally infested sites in southern Humboldt County, California. In November 2006, healthy, potted redwood seedlings were placed mid tanoak and bay trees naturally infected with P. ramorum. Symptoms and disease incidence are being observed periodically, and every two months, a subset of redwood seedlings is destructively sampled to investigate the location and extent of tissue colonization by P. ramorum. To assess inoculum levels to which seedlings are exposed, and to correlate this with disease development, rainwater is being collected for quantification of P. ramorum propagules. Results of this study will help evaluate the risk of P. ramorum to coast redwood seedlings and inform land managers of the potential for reforestation of infested sites with this species.
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CitationLucas, Sunny; Parke, Jennifer L.; Valachovic, Yana. 2008. Development of Phytophthora ramorum infection and disease symptoms on coast redwood seedlings. In: Frankel, Susan J.; Kliejunas, John T.; Palmieri, Katharine M., tech. coords. 2008. Proceedings of the sudden oak death third science symposium. Gen. Tech. Rep. PSW-GTR-214. Albany, CA: U.S. Department of Agriculture, Forest Service, Pacific Southwest Research Station. p. 397
KeywordsPhytophthora ramorum, Sequoia sempervirens
- Decomposition and N cycling changes in redwood forests caused by sudden oak death
- Regeneration and tanoak mortality in coast redwood stands affected by sudden oak death
- Prevalence and development of disease on coast redwood seedlings caused by Phytophthora ramorum
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