Phyllactinia oemleriae is a species of powdery mildew in the family Erysiphaceae. It is found in North America, where it affects the genus Oemleria.
Description The fungus forms a weak, very thin, often smooth coating on the undersides of leaves. P. oemleriae, like most Erysiphaceae, is highly host-specific and infects only the genus Oemleria. It is the only powdery mildew species found on this host.
Taxonomy The fungus was formally described in 2025 by Michael Bradshaw and James Kameron Mitchell.
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