Cystotheca lanestris
FungiFamily: Erysiphaceae · Genus: Cystotheca

Franco Folini from San Francisco, USA · cc_by_sa
About
Cystotheca lanestris is a species of powdery mildew in the family Erysiphaceae. It is found in North America on plants in the genus Quercus. Its primary range is south-western United States and north-western Mexico, mostly along the coast where its preferred host plants are found.
Summary from Wikipedia
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Growing details and traits for Cystotheca lanestris in the Library.
No cultivars in the Library yet — the full profile above covers the species itself.