Phytophthora siskiyouensis

Species profile prepared by E. M. Hansen, P. Reeser, and S. Rooney-Latham

To cite, see Forest Phytophthoras (2011) doi: 10.5399/osu/fp.1.1.1826


Chen W, Djama ZR, Coffey MD, Martin FN, Bilodeau GJ, Radmer L, Denton G, Lévesque AC. Membrane-based oligonucleotide array developed from multiple markers for the detection of many Phytophthora species. Phytopathology. 2013 ;103(1):43 - 54.
Coffey MD, Mathews DM. Phytophthora siskiyouensis on alders in southern California: an update. 58th Annual Meeting of the California Forest Pest Council, What’s Ailing California’s Forests? 2009 :pg 46-47.
Grünwald NJ, Martin FN, Larsen MM, Sullivan CM, Press CM, Coffey MD, Hansen EM, Parke JL. a sequence-based Phytophthora identification tool. Plant Disease [Internet]. 2011 ;95:337-342. Available from:
Hansen EM, Reeser PW, Sutton W. Phytophthora beyond agriculture. Annual Review of Phytopathology [Internet]. 2012 ;50(1):359 - 378. Available from:
Kroon LPNM, Brouwer H, de Cock AWAM, Govers F. The genus Phytophthora anno 2012. Phytopathology [Internet]. 2012 ;102(4):348 - 364. Available from:
Martin FN, Abad GZ, Balci Y, Ivors K. Identification and detection of Phytophthora: reviewing our progress, identifying our needs. Plant Disease [Internet]. 2012 ;96:1080-1103. Available from:
Navarro S, Sims L, Hansen E, Vannini Á. Pathogenicity to alder of Phytophthora species from riparian ecosystems in western Oregon. Forest Pathology [Internet]. 2015 ;45(5):358 - 366. Available from:
Pérez-Sierra A, Kalantarzadeh M, Sancisi-Frey S, Brasier CM. Phytophthora siskiyouensis causing stem lesions and cankers on Alnus incana. New Disease Reports [Internet]. 2015 ;31:17. Available from:
Reeser PW, Hansen EM, Sutton W. Phytophthora siskiyouensis, a new species from soil, water, myrtlewood (Umbellularia californica) and tanoak (Lithocarpus densiflorus) in southwestern Oregon. Mycologia [Internet]. 2007 ;99:639-643. Available from:
Reeser P, Hansen E, Sutton W. Phytophthora siskiyouensis, a new species from soil and water in southwest Oregon Frankel SJ, Kliejunas JT, Palmieri KM. The Sudden Oak Death Third Science Symposium [Internet]. 2010 ;General Technical Report PSW-GTR-214:439–441. Available from:
Reeser PW, Sutton W, Hansen EM. Phytophthora species causing tanoak stem cankers in southwestern Oregon. Plant Disease [Internet]. 2008 ;92:1252. Available from:
Reeser P, Sutton W, Hansen E. Phytophthora species in tanoak trees, canopy drip, soil, and streams in the sudden oak death epidemic area in southwestern Oregon. The Fifth Meeting of the International Union of Forest Research Organizations (IUFRO), Working Party 7.02.09. 2010 .
Reeser PW, Sutton W, Hansen EM, Remigi P, Adams GC. Phytophthora species in forest streams in Oregon and Alaska. Mycologia [Internet]. 2011 ;103:22-35. Available from:
Robideau GP, a. De Cock AWM, Coffey MD, Voglmayr H, Brouwer H, Bala K, Chitty DW, Désaulniers N, Eggertson QA, Gachon CMM, et al. DNA barcoding of oomycetes with cytochrome c oxidase subunit I and internal transcribed spacer. Molecular Ecology Resources [Internet]. 2011 ;11(6):1002–1011. Available from:
Rooney-Latham S, Blomquist CL, Pastalka T, Costello LR. First report of Phytophthora siskiyouensis causing disease on Italian alder in Foster City, California. 2007 APS Annual Meeting [Internet]. 2007 ;Phytopathology 97: S101. Available from:
Rooney-Latham S, Blomquist CL, Pastalka T, Costello L. Collar rot on Italian alder trees in California caused by Phytophthora siskiyouensis. Plant Health Progress [Internet]. 2009 . Available from:
Smith, I. W., Cunnington J, Pascoe I. Another new? species of Phytophthora on alder ‘down under’ (Australia). Brasier C, Jung T, Osswald W. Third International Meeting on Phytophthoras in Forest and Wildland Ecosystems. 2006 ;7:Poster 30.
Sims L, Goheen E, Kanaskie A, Hansen E. Alder Canopy Dieback and Damage in Western Oregon Riparian Ecosystems. Northwest Science [Internet]. 2015 ;89(1):34 - 46. Available from:
Sims LL, Sutton W, Reeser P, Hansen EM. The Phytophthora species assemblage and diversity in riparian alder ecosystems of western Oregon, USA. Mycologia [Internet]. 2015 ;107(5):889 - 902. Available from: