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.

Closest relatives