The Family Erysiphaceae, commonly known as powdery mildews, is a group of fungi that affects a wide range of plants. This family is known for its powdery white appearance on the leaves, stems, and flowers of plants, which can lead to damage and reduced crop yields. Several synonyms are commonly used to describe the Family Erysiphaceae including the Order Erysiphales, the Ascomycetes, and the fungus genus Uncinula. While these synonyms are different names for the same family of fungi, they are used interchangeably by scientists and plant pathologists to describe this important group of plant pathogens.