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Washington State University
WSU Puyallup Ornamental Plant Pathology

Results of BOB sampling at Clarks Creek

The most commonly isolated group of Oomycetes was Pythium belonging to Clade B2. There was little difference among hosts, except for reed canarygrass from which only one Pythium sp. was isolated. Saprolegnia was isolated from three hosts. Two Phytophthoras belonging to Clade 6 were isolated, and these, as well as Pythiums in Clade B2, were commonly found at the other freshwater sites sampled in this study. Phylogenetic trees from sequence data obtained in this study:

Phytophthora Pythium Saprolegnia

 

Host species isolated group or clade Riparian/forest # isolates
False lily of the valley Maianthemum dilatatum Fusarium spp. fungus
F
2
False lily of the valley Maianthemum dilatatum Phytophthora taxon ‘salixsoil’ 6
F
1
False lily of the valley Maianthemum dilatatum Pythium diclinum/lutarium B2
F
5
Grand fir Abies grandis Phytophthora taxon ‘pgchlamydo’ 6
F
1
Grand fir Abies grandis Pythium aquatile B2
F
1
Grand fir Abies grandis Pythium diclinum/lutarium B2
F
7
Licorice fern Polypodium glycorrhiza Mucor hiernalis zygomycete
F
1
Licorice fern Polypodium glycorrhiza Pythium aquatile B2
F
1
Licorice fern Polypodium glycorrhiza Pythium diclinum/lutarium B2
F
2
Licorice fern Polypodium glycorrhiza Pythium oopapillum B2
F
1
Rhododendron Rhododendron ‘Nova Zembla’ Pythium aquatile B2
F
1
Rhododendron Rhododendron ‘Nova Zembla’ Pythium diclinum/lutarium B2
F
5
Rhododendron Rhododendron ‘Nova Zembla’ Saprolegnia parasitica Saprolegnia
F
1
Red alder Alnus rubra Pythium diclinum/lutarium B2
R
5
Red alder Alnus rubra Pythium oopapillum B2
R
2
Red alder Alnus rubra Pythium undulatum H
R
1
Reed canary grass Phalaris arundinacea Pythium intermedium F
R
8
Salmonberry Rubus spectabilis Pythium diclinum/lutarium B2
R
8
Salmonberry Rubus spectabilis Pythium oopapillum B2
R
1
Salmonberry Rubus spectabilis Saprolegnia parasitica Saprolegnia
R
1
Skunk cabbage Lysichiton americanum Mortierella sp. zygomycete
R
1
Skunk cabbage Lysichiton americanum Pythium diclinum/lutarium B2
R
3
Skunk cabbage Lysichiton americanum Saprolegnia diclina Saprolegnia
R
1

Pierce College BOB 2011_allhosts

Contact: Gary Chastagner, 253-445-4528 | WSU Puyallup Research & Extension Center, 2606 West Pioneer, Puyallup, WA, 98371-4998 USA
Last updated January 2, 2013