Mycologia (2015) 107, 889-902

Laura Lee Sims, Wendy Sutton, Paul Reeser and Everett M. Hansen (2015)
The Phytophthora species assemblage and diversity in riparian alder ecosystems of western Oregon, USA
Mycologia 107 (5), 889-902
Abstract: Phytophthora species were systematically sampled, isolated, identified and compared for presence in streams, soil and roots of alder (Alnus species) dominated riparian ecosystems in western Oregon. We describe the species assemblage and evaluate Phytophthora diversity associated with alder. We recovered 1250 isolates of 20 Phytophthora species. Only three species were recovered from all substrates (streams, soil, alder roots): P. gonapodyides, the informally described "P. taxon Pgchlamydo", and P. siskiyouensis. P. alni ssp. uniformis along with five other species not previously recovered in Oregon forests are included in the assemblage: P.citricola s.l., P. gregata, P. gallica, P. nicotianae and P. parsiana. Phytophthora species diversity was greatest in downstream riparian locations. There was no significant difference in species diversity comparing soil and unwashed roots (the rhizosphere) to stream water. There was a difference between the predominating species from the rhizosphere compared to stream water. The most numerous species was the informally described "P. taxon Oaksoil", which was mainly recovered from, and most predominant in, stream water. The most common species from riparian forest soils and alder root systems was P. gonapodyides.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
(original language: English)
Link to article at publishers website
Database assignments for author(s): Everett M. Hansen

Research topic(s) for pests/diseases/weeds:
surveys/sampling/distribution

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Phytophthora citricola		U.S.A. (NW)
	Phytophthora gallica		U.S.A. (NW)
	Phytophthora gonapodyides	Alder (Alnus)	U.S.A. (NW)
	Phytophthora uniformis	Alder (Alnus)	U.S.A. (NW)
	Phytophthora nicotianae		U.S.A. (NW)
	Phytophthora siskiyouensis		U.S.A. (NW)
	Phytophthora parsiana		U.S.A. (NW)
	Phytophthora gregata		U.S.A. (NW)