Sudden Oak Death Caused by Phytophthora ramorum in Oregon

Plant Disease
E M GoheenW Sutton

Abstract

Sudden oak death, caused by Phytophthora ramorum (1,2), has been found for the first time in Oregon, killing tanoak, Lithocarpus densiflorus, trees. To our knowledge, this is the first report of the disease outside of the San Francisco to Monterey area in California, (300 km to the south). Nine areas of infestation, all within a 24-km2 area, were discovered on forest lands near Brookings, in southwest Oregon. Mortality centers ranged in size from 0.2 to 4.5 ha and included 5 to approximately 40 diseased trees. P. ramorum was isolated from stem cankers using Phytophthora-selective medium. Isolates had distinctive morphological features characteristic of P. ramorum, including abundant production of chlamydospores and caducous, semipapillate sporangia on solid media. Internal transcribed spacer (ITS) sequences of isolates of P. ramorum from Oregon were identical to ITS sequences of isolates from California (1). The pathogen also was isolated from necrotic lesions on leaves and stems of native Rhododendron macrophyllum and Vaccinium ovatum growing beneath diseased tanoaks. In July 2001, the disease was located by an aerial survey conducted cooperatively by the USDA Forest Service and Oregon Department of Forestry. All lands within ...Continue Reading

Citations

Jun 1, 2011·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·Clive PotterIsobel Tomlinson
Dec 16, 2017·IMA Fungus·Xiao YangChuanxue Hong
Nov 5, 2005·Applied and Environmental Microbiology·J A TomlinsonI Barker
Apr 3, 2004·Letters in Applied Microbiology·P KongP A Richardson
Oct 17, 2007·FEMS Microbiology Letters·Didier ChavarriagaSteve Woodward
Apr 1, 2007·Plant Disease·Paul W Tooley, Kerrie L Kyde
Apr 15, 2015·Phytopathology·Ebba K PetersonAlan Kanaskie
Oct 24, 2008·Phytopathology·J M DavidsonD M Rizzo
Oct 24, 2008·Phytopathology·Jennifer M DavidsonDavid M Rizzo

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