Skip to Main Content
2006 pilot survey for Phytophthora ramorum in forest streams in the USAAuthor(s): S.W. Oak; J. Hwang; S.N. Jeffers; B.M. Tkacz
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. 59-64
Publication Series: General Technical Report (GTR)
Station: Pacific Southwest Research Station
PDF: Download Publication (297 KB)
DescriptionMethods for detecting Phytophthora ramorum and other Phytophthora species with rhododendron leaf baits were pilot tested in high-risk watersheds in 11 states for the purpose of recommending a national survey protocol. Ninety streams, including 14 draining P. ramorum.-endemic areas, yielded 587 baiting chances. Molecular diagnostic assays detected the pathogen in all known P. ramorum-endemic streams at least once in five baiting periods, and in nearly 50 percent of all bait leaf sets. Isolation using selective media detected the pathogen in all but one known positive stream in California and Oregon, and for the first time in one Washington stream draining a confirmed positive ornamental nursery. Overall, Phytophthora spp. were detected by isolation in all but one stream over the course of the pilot survey, and in over 80 percent of the leaf bait sets. The national P. ramorum early detection survey for U.S. forests will recommend rhododendron leaf baiting for five baiting periods in high-risk watersheds with redundant molecular and selective media isolation assays for 2007.
- You may send email to email@example.com to request a hard copy of this publication.
- (Please specify exactly which publication you are requesting and your mailing address.)
- We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
- This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.
CitationOak, S.W.; Hwang, J.; Jeffers, S.N.; Tkacz, B.M. 2008. 2006 pilot survey for Phytophthora ramorum in forest streams in the USA. 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. 59-64
KeywordsPhytophthora ramorum, survey, Phytophthora baiting
- Stream monitoring for detection of Phytophthora ramorum in Oregon
- Stream Monitoring for Detection of Phytophthora ramorum in Oregon Tanoak Forests
- In vitro testing of biological control agents on A1 and A2 isolates of Phytophthora ramorum
XML: View XML