powdery mildew

noun

any of various parasitic fungi of the ascomycete order Erysiphales, which produce a powderlike film of mycelium on the surface of host plants.
Plant Pathology. a disease caused by powdery mildew, characterized by yellowing and death of the foliage and a white mealy growth of fungus on the surface of above-ground parts.

Origin of powdery mildew

An Americanism dating back to 1885–90

Words nearby powdery mildew

powder-puff, powdered milk, powdered sugar, powderman, powdery, powdery mildew, powell, powell, colin, power, power amplifier, power assist

British Dictionary definitions for powdery mildew

powdery mildew

noun

a plant disease characterized by a superficial white powdery growth on stems and leaves, caused by parasitic ascomycetous fungi of the family Erysiphaceae: affects the rose, aster, apple, vine, oak, etc
any of the fungi causing this disease
Compare downy mildew

Scientific definitions for powdery mildew

powdery mildew
[ pou′də-rē ]

Any of various important plant diseases caused by fungi, especially those of the family Erysiphaceae, which produce powdery conidia on the surface of the hosts leaves and stems.