powdery mildew
noun
Definition of powdery mildew
1 : an ascomycetous fungus (family Erysiphaceae) producing abundant powdery conidia on the host
2 : a plant disease caused by a powdery mildew
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1889
First Known Use of powdery mildew
1889
Learn More about powdery mildew
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Britannica.com: Encyclopedia article about powdery mildew
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