powdery mildew

Definition of powdery mildew

a fungal disease of plants caused by an ascomycete of the order Erysiphales, characterized by a powdery white film on the surface of the affected plants. It is damaging to, e.g., roses and lilacs. Also, a fungus that causes such a disease.

See also: Mildew

Related Words

Erysiphe, genus Erysiphe, mildew
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