Genus Erysiphe is a plant pathogenic fungus that belongs to the family Erysiphaceae. It commonly affects the leaves and stems of various plant species. Some synonyms for Genus Erysiphe include powdery mildew, white mold, and Oidium. These terms are used interchangeably to describe the fungal disease caused by Genus Erysiphe. Powdery mildew is characterized by a white or grayish powdery coating on the surface of leaves and stems of infected plants. White mold, on the other hand, is a fungal disease that causes a white, fluffy growth on the infected plant tissue. Oidium, meanwhile, refers to the fungal spores or mycelium of Genus Erysiphe, which are visible on the infected plant surface.