Journal
MYCOLOGIA
Volume 103, Issue 1, Pages 22-35Publisher
TAYLOR & FRANCIS INC
DOI: 10.3852/10-013
Keywords
P. cactorum; P. cambivora; P. europaea; P. megasperma; P. pini; P. plurivora; P. ramorum; P. syringae
Categories
Funding
- USDA Forest Service
- Pacific Southwest Research Station
- Forest Health Protection groups in Oregon
- Forest Health Protection groups in California
- Forest Health Protection groups in Alaska
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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.
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