Dictionary  pow'dery mil'dew1. any of various parasitic fungi of the ascomycete order Erysiphales, which produce a powderlike film of mycelium on the surface of host plants. 2. Plant Pathol.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. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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