First Report of Powdery Mildew of Mahonia aquifolium Caused by Microsphaera berberidis (Erysiphe berberidis) in North America

D. A. Glawe

February 2003

Brief

Mahonia aquifolium is a widely-grown plant in the coastal Pacific Northwest. This report documents for the first time a powdery mildew on M. aquifolium in North America caused by a fungus fitting the description of Microsphaera berberidis.

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