Podosphaera prunicola

The fungus forms effuse or patchy, white to greyish mycelium on host leaves. Podosphaera prunicola, like most Erysiphaceae, is highly host-specific and infects only Prunus.^[1] There are a great many other species of powdery mildew on Prunus, so care should be taken with identification. In North America, P. prunicola is the most common widespread Prunus powdery mildew species, common on hosts such as Prunus virginiana.^[2] In Europe, it occurs on introduced Prunus from North America, most often Prunus serotina.

Podosphaera prunicola was originally described by Jaczewski in 1927 as Podosphaera oxycanthae f. pruni. The forma was elevated to a species by Uwe Braun in 2012.