powdery-mildew

powdery mildew

noun
1.
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 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:
1885–90, Americanism

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Collins
World English Dictionary
powdery mildew
 
n
1.  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
2.  any of the fungi causing this disease

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
powdery mildew   (pou'də-rē)  Pronunciation Key 
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.
The American Heritage® Science Dictionary
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