Skip to Main Content
-
Phytophthora species in tanoak trees, canopy-drip, soil, and streams in the sudden oak death epidemic area of south-western Oregon, USA
Author(s): Paul Reeser; Wendy Sutton; Everett Hansen.
Date: 2011
Source: New Zealand Journal of Forestry Science 41S:S65-S73
Publication Series: Scientific Journal (JRNL)
PDF: View PDF (1.27 MB)Description
Various Phytophthora species were recovered from tanoak trees, tanoak canopy drip, soils, and streams, which were sampled as part of a larger survey and management effort aimed at limiting the spread of Phytophthora ramorum Werres, De Cock & Man in't Veld (the causal agent of sudden oak death) in an epidemic area encompassing native forest and urbanised forest areas in south-western Oregon. Environmental samples were analysed by baiting with either green pear fruits or rhododendron and tanoak leaves. Tanoak bark samples and baits from environmental samples were plated on media semi-selective for the isolation of Phytophthora spp. After incidence of P. ramorum growing on isolation plates was recorded, other Phytophthora species growing on the isolation plates were sub-cultured for identification. DNA sequencing was used to identify the unknown Phytophthora species. A total of seventeen Phytophthora species and one HaloPhytophthora species were identified across all substrates. Over an 8-year period, P. ramorum was detected in cultures from 41% of samples from over 1600 diseased tanoak trees, while other Phytophthora species were detected in 14% of these samples. Of 5189 tanoak canopy drip samples collected over a 4-year period, Phytophthora species other than P. ramorum were detected in 106 samples (2.0%). Of 5967 soil samples baited over an 8-year period, Phytophthora species other than P. ramorum were detected in 71 samples (1.2%). Phytophthora ramorum was detected in ca. 10% of 642 stream samples over a 3-year period, and other Phytophthora species were detected in ca. 86% of these stream samples.Publication Notes
- You may send email to psw_communications@fs.fed.us 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.
Citation
Reeser, Paul; Wendy Sutton; Everett Hansen. 2011. Phytophthora species in tanoak trees, canopy-drip, soil, and streams in the sudden oak death epidemic area of south-western Oregon, USA. New Zealand Journal of Forestry Science 41S:S65-S73.Keywords
Forest Phytophthora, P. cactorum, P. cambivora, P. cinnamomi, P. gonapodyides, P. nemorosa, P. pseudosyringae, P. siskiyouensis, P. taxon Pgchlamydo, P. taxon SalixsoilRelated Search
- Regeneration and tanoak mortality in coast redwood stands affected by sudden oak death
- Assessing Methods to Protect Susceptible Oak and Tanoak Stands from Sudden Oak Death
- Effects of Sudden Oak Death on the crown fire ignition potential of tanoak (Lithocarpus densiflorus)
XML: View XML
Show More
Show Fewer
https://www.fs.usda.gov/treesearch/pubs/39061