01614nas a2200169 4500008004100000245006400041210006400105300001000169490000800179520109600187100002001283700001801303700002301321700002101344700002001365856005901385 2011 eng d00aPhytophthora species in forest streams in Oregon and Alaska0 aPhytophthora species in forest streams in Oregon and Alaska a22-350 v1033 a

Eighteen Phytophthora species and one species of Halophytophthora were identified in 113 forest streams in Alaska, western Oregon and southwestern Oregon that were sampled by baiting or filtration of stream water with isolation on selective media. Species were identified by morphology and DNA characterization with single strand conformational polymorphism, COX spacer sequence and ITS sequence. ITS Clade 6 species were most abundant overall, but only four species, P. gonapodyides (37% of all isolates), P. taxon Salixsoil, P. taxon Oaksoil and P. pseudosyringae, were found in all three regions. The species assemblages were similar in the two Oregon regions, but P. taxon Pgchlamydo was absent in Alaska and one new species present in Alaska was absent in Oregon streams. The number of Phytophthora propagules in Oregon streams varied by season and in SW Oregon, where sampling continued year round, P. taxon Salixsoil, P. nemorosa and P. siskiyouensis were recovered only in some seasons.

1 aReeser, Paul, W1 aSutton, Wendy1 aHansen, Everett, M1 aRemigi, Philippe1 aAdams, Gerry, C uhttp://www.mycologia.org/cgi/content/abstract/103/1/22