powdery mildew

noun

1
: an ascomycetous fungus (family Erysiphaceae) producing abundant powdery conidia on the host
2
: a plant disease caused by a powdery mildew

Examples of powdery mildew in a Sentence

Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
Dahlias are susceptible to powdery mildew, so be sure to allow proper airflow around each plant to keep them healthy. Mary Marlowe Leverette, Southern Living, 9 July 2025 Wet plant parts are most prone to powdery mildew growth. Leanne Potts, Better Homes & Gardens, 8 July 2025 The only exceptions are: – When plants have powdery mildew, selectively remove branches (not just leaves) to improve air circulation. – When branches/leaves touch mulch or soil. Nan Sterman, San Diego Union-Tribune, 6 July 2025 Bee balm loves moisture but is susceptible to powdery mildew, so choose a variety that is resistant. Arricca Elin Sansone, Southern Living, 20 June 2025 See All Example Sentences for powdery mildew

Word History

First Known Use

1889, in the meaning defined at sense 1

Time Traveler
The first known use of powdery mildew was in 1889

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Cite this Entry

“Powdery mildew.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/powdery%20mildew. Accessed 16 Jul. 2025.

Kids Definition

powdery mildew

noun
: a fungus that is a parasite and produces a large number of powdery spores on the host
also : a plant disease caused by such a fungus

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