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First Report of Powdery Mildew of Hypericum perforatum (St. John’s-wort) Caused by an Anamorphic Microsphaera Species in the Pacific Northwest

D. A. Glawe

July 2004


St. John’s-wort has been valued as a medicinal herb for centuries. During the 2002 growing season a specimen plant with powdery mildew symptoms was observed in a demonstration garden in Kenmore, King County, WA. This report provides information on symptoms of the disease, morphological features useful in characterizing the causal agent, and taxonomic aspects of the fungus.


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