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
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Roses are notoriously finicky and prone to diseases like black spot and powdery mildew, so this tougher version that could roll with the punches and didn’t require regular spraying with fungicide seemed like the champion of shrub roses.
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Libby Monteith Minor, Southern Living, 16 May 2026
Cucumber plants are vulnerable to powdery mildew and targeted by cucumber beetles.
—Barbara Gillette, The Spruce, 12 May 2026
This cultivar is also tolerant of powdery mildew, a common plant disease that can affect the quality of dahlia flowers.
—Sophia Beams, Better Homes & Gardens, 6 May 2026
Unlike most fungal diseases, powdery mildew does not require free water on leaf surfaces to germinate; in fact, moisture on leaves can inhibit spore development.
—Rita Perwich, San Diego Union-Tribune, 2 May 2026
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Libby Monteith Minor, Southern Living, 16 May 2026
Cucumber plants are vulnerable to powdery mildew and targeted by cucumber beetles.
—Barbara Gillette, The Spruce, 12 May 2026
This cultivar is also tolerant of powdery mildew, a common plant disease that can affect the quality of dahlia flowers.
—Sophia Beams, Better Homes & Gardens, 6 May 2026
Unlike most fungal diseases, powdery mildew does not require free water on leaf surfaces to germinate; in fact, moisture on leaves can inhibit spore development.
—Rita Perwich, San Diego Union-Tribune, 2 May 2026
See All Example Sentences for powdery mildew
Cite this Entry
“Powdery mildew.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/powdery%20mildew. Accessed 23 May. 2026.
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