Erysiphaceae

Powdery mildews
Golovinomyces sordidus demonstrating typical white patches on a leaf of Plantago major
Scientific classification
Kingdom: Fungi
Division: Ascomycota
Class: Leotiomycetes
Order: Helotiales
Family: Erysiphaceae
Tul. & C.Tul., 1861

Erysiphaceae (commonly known as powdery mildews) is a family of ascomycete fungi in the order Helotiales. The members of this family are obligate parasites with a superficial mycelium that forms a characteristic white, powdery coating on their host plants.

The family contains seventeen genera and around a thousand species. Combined they infect over 10,000 species of plants, many of which are commercially valuable.