New records for powdery mildews and Taphrina species in Idaho and Washington

Frank M. Dugan, George Newcombe

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Abstract

Podosphaera (Sphaerothecaeuphorbiae on Euphorbia epithymoides (= E. polychroma, cushion spurge) is reported for the first time in North America. Neoerysiphe Erysiphe galeopsidis on Lamium amplexicaule (henbit), Blumeria (Erysiphegraminis onFestuca 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 misdetermined Neoerysiphe galeopsidis.

Keywords

Alnus rubra; Blumeria graminis; cushion spurge; Erysiphe cichoracearum; Erysiphe galeopsidis; Erysiphe graminis; Euphorbia epithymoides; Euphorbia polychroma; Festuca idahoenis; henbit; Idaho fescue; Lamium amplexicaule; Neoerysiphe galeopsidis; Podosphae



DOI: http://dx.doi.org/10.2509/pnwf.2007.002.008

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