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Pathogenicity variation in two west coast forest Phytophthoras, Phytophthora nemorosa and P. pseudosyringae, to bay laurelAuthor(s): R.E. Linzer; M. Garbelotto
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. pp. 387-388
Publication Series: General Technical Report (GTR)
Station: Pacific Southwest Research Station
PDF: Download Publication (146 KB)
DescriptionTwo recently described pathogenic oomycetes, Phytophthora nemorosa and P. pseudosyringae, have overlapping host and geographic ranges in California and Oregon forests with P. ramorum, causal agent of ?sudden oak death? disease. Preliminary genetic evidence indicates P. nemorosa and P. pseudosyringae may be introduced in this region; their sympatric distribution with P. ramorum suggests they may be an interacting factor in P. ramorum disease.The ultimate goal of this project is to characterize the outcome of interaction during infection by P. ramorum, P. nemorosa and P. pseudosyringae in the epidemiologically important host, bay laurel (Umbellularia californica). Experiments will account for variability in host, pathogen and environment, and leaf lesion area in detached bay leaves will be used as the proxy for pathogenicity. Therefore, the proximal goals of this portion of the project are to describe pathogenicity variability and refine methods for leaf infection. Here, we describe four preliminary experiments conducted to select Phytophthora isolates for inoculation and to optimize leaf infection methods.
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CitationLinzer, R.E.; Garbelotto, M. 2008. Pathogenicity variation in two west coast forest Phytophthoras, Phytophthora nemorosa and P. pseudosyringae, to bay laurel. 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. pp. 387-388
KeywordsUmbellularia californica, detached leaf, zoospore, sporangia, inoculation
- Summer survival of Phytophthora ramorum in California bay laurel leaves
- Susceptibility to Phytophthora ramorum in California bay laurel, a key foliar host of sudden oak death
- The key host for an invasive forest pathogen also facilitates the pathogen’s survival of wildfire in California forests
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