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

Examples of powdery mildew in a Sentence

Recent Examples on the Web

Newer crape myrtles are normally powdery mildew-free with full sun exposures and in unprotected areas. — Tom Maccubbin, OrlandoSentinel.com, "Summer heat, rain not kind to geraniums," 30 June 2018 The variety is supposed to be resistant to powdery mildew, so what could this be? — Tom Maccubbin, OrlandoSentinel.com, "Summer heat, rain not kind to geraniums," 30 June 2018 Also, plants watered by drip irrigation don’t end up with wet foliage from sprinkler spray, and that can help prevent some foliage diseases such as powdery mildew. — The Editors Of Organic Life, Good Housekeeping, "How To Use Soaker Hoses To Install A Drip Irrigation System In Your Garden," 7 Mar. 2017 MacDonald described a crop that was infected with powdery mildew from the beginning and later was infested with spider mites and other pests. — Michael Dresser, Washington Post, "Regulators investigate Maryland medical marijuana grower for alleged pesticide use," 10 July 2018 Answer: What sort of looks like snow is called powdery mildew, a fungal disease. — Tom Maccubbin, OrlandoSentinel.com, "White coating on crape myrtle is fungus," 26 May 2018 McDonald described a crop that was infected with powdery mildew from the beginning and later was infested with spider mites and other pests. — Michael Dresser, baltimoresun.com, "Regulators investigating Maryland medical marijuana grower for alleged pesticide use," 9 July 2018 Please don’t blame me when I get covered in powdery mildew and catch other fungal diseases. — Rita Perwich, sandiegouniontribune.com, "Send the right blooming messages to your roses," 5 July 2018 Your local garden center horticulturist can help select one of the newer systemic fungicides labeled for powdery mildew control on crape myrtles. — Tom Maccubbin, OrlandoSentinel.com, "White coating on crape myrtle is fungus," 26 May 2018

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'powdery mildew.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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Last Updated

6 Sep 2018

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The first known use of powdery mildew was in 1889

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