Skip to Main Content
Stream Monitoring for Detection of Phytophthora ramorum in Oregon Tanoak ForestsAuthor(s): W. Sutton; E. M. Hansen; P. W. Reeser; A. Kanaskie
Source: Plant Disease 93(11): 1182-1186
Publication Series: Scientific Journal (JRNL)
Station: Pacific Southwest Research Station
View PDF (534.78 KB)
DescriptionStream monitoring using leaf baits for early detection of Phytophthora ramorum has been an important part of the Oregon Sudden Oak Death (SOD) program since 2002. Sixty-four streams in and near the Oregon quarantine area in the southwest corner of the state were monitored in 2008. Leaves of rhododendron (Rhododendron macrophyllum) and tanoak (Lithocarpus densiflorus) were placed in mesh bags, and bags were floated in streams. Leaf baits were exchanged every 2 weeks throughout the year. Leaves were assayed by isolation on selective medium and by multiplex rDNA internal transcribed spacer polymerase chain reaction (ITS PCR). The two methods gave comparable results, but multiplex PCR was more sensitive. P. ramorum was regularly recovered at all seasons of the year from streams draining infested sites 5 years after eradication treatment. In streams with lower inoculum densities, recovery was much higher in summer than in winter. P. ramorum was isolated from streams in 23 watersheds. When P. ramorum was detected, intensive ground surveys located infected tanoaks or other host plants an average of 306 m upstream from the bait station. P. ramorum was isolated from stream baits up to 1,091 m from the probable inoculum source.
- You may send email to firstname.lastname@example.org 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.
CitationSutton, W.; Hansen, E. M.; Reeser, P. W. ; Kanaskie, A. 2009. Stream Monitoring for Detection of Phytophthora ramorum in Oregon Tanoak Forests. Plant Disease. Volume 93, Number 11. Pages 1182-1186
- Phytophthora species in tanoak trees, canopy-drip, soil, and streams in the sudden oak death epidemic area of south-western Oregon, USA
- Survival, dispersal, and potential soil-mediated suppression of Phytophthora ramorum in a California redwood-tanoak forest
- Stream monitoring for detection of Phytophthora ramorum in Oregon
XML: View XML