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ARS Home » Pacific West Area » Pullman, Washington » Plant Germplasm Introduction and Testing Research » Research » Publications at this Location » Publication #217347

Title: New records for powdery mildews and Taphrina spp. in Idaho and Washington

item Dugan, Frank

Submitted to: Pacific Northwest Fungi
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 12/7/2007
Publication Date: 12/15/2007
Citation: Dugan, F.M., Newcombe, G. 2007. New records for powdery mildews and Taphrina spp. in Idaho and Washington. Pacific Northwest Fungi 2(8): 1-5, doi: 10.2509/pnwf.2007.002.008..

Interpretive Summary: New fungus-host records for a particular locale, be it North America or a state or province, are helpful to regulatory officials, agricultural extension agents, extension plant pathologists, plant disease diagnosticians and others working in the field of plant health. This article documents one such record new for North America, and five others new to Idaho. The fungi are powdery mildews, plant pathogenic fungi which occur only on their hosts and which cannot be propagated on artificial media, and species of Taphrina, which assume their characteristic (diagnostic) morphology only on their host.

Technical Abstract: Podosphaera euphorbiae (= Sphaerotheca euphorbiae) on Euphorbia epithymoides (= E. polychroma, cushion spurge) is reported for the first time in North America. Neoerysiphe galeopsidis (= Erysiphe galeopsidis) on Lamium amplexicaule (henbit), Blumeria graminis (= Erysiphe graminis) on Festuca idahoenis (Idaho fescue), Taphrina johansonii on Populus tremuloides (trembling aspen), and Taphrina occidentalis on Alnus rubra (red alder) are reported for the first time from Idaho. Reports of Erysiphe cichoracearum on henbit may reflect misidentified Neoerysiphe galeopsidis.