noun
1. : a perfect fungus of the family Erysiphaceae or an imperfect fungus of the genus Oidium distinguished by the abundant powdery conidia produced on the host
2. : a plant disease caused by a powdery mildew — compare downy mildew
noun
1. : a perfect fungus of the family Erysiphaceae or an imperfect fungus of the genus Oidium distinguished by the abundant powdery conidia produced on the host
2. : a plant disease caused by a powdery mildew — compare downy mildew
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012