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 Powdery mildew is nearly impossible to control Q: Several of my bushes have powdery mildew. oregonlive, "How does smoke, ash from wildfires affect chickens? Eggs? Ask an expert," 18 Oct. 2020 Keep water off the foliage to prevent powdery mildew and possible crown rot. Earl Nickel, SFChronicle.com, "Begonias add cheer to the Bay Area winter garden," 4 Dec. 2020 The reason: These little champs feed on powdery mildew. oregonlive, "Is this beetle good or bad for the garden? Ask an expert," 9 Oct. 2020 Common pests & diseases Black spot and powdery mildew are common fungal diseases, while crown gall disease may occur less commonly. Earl Nickel, SFChronicle.com, "How to grow a grapevine to add drama to any garden," 7 Aug. 2020 Especially with the old ones, proper pruning helps prevent powdery mildew. Margaret Roach, New York Times, "Is It Time to Prune Yet?," 5 May 2020 For diseases that have started to appear, such as powdery mildew on squash, zucchini and other crops, there are several effective organic choices. Howard Garrett, Dallas News, "How to manage mildew and other problems in your vegetable garden," 22 Apr. 2020 Water at the bases to keep foliage dry and avoid problems like powdery mildew. Johanna Silver, Better Homes & Gardens, "More Than 1,000 Peonies Fill This Colorful Midwestern Garden," 8 Apr. 2020 Reputable nurseries should be able to give advice on varieties that are resistant to scab or powdery mildew. oregonlive, "Now’s the time for pruning and spraying apple trees: Here are some tips," 11 Feb. 2020

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.

See More

First Known Use of powdery mildew

1889, in the meaning defined at sense 1

Keep scrolling for more

Learn More about powdery mildew

Time Traveler for powdery mildew

Time Traveler

The first known use of powdery mildew was in 1889

See more words from the same year

Statistics for powdery mildew

Last Updated

17 Jan 2021

Cite this Entry

“Powdery mildew.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/powdery%20mildew. Accessed 25 Jan. 2021.

More from Merriam-Webster on powdery mildew

Britannica.com: Encyclopedia article about powdery mildew

Comments on powdery mildew

What made you want to look up powdery mildew? Please tell us where you read or heard it (including the quote, if possible).

WORD OF THE DAY

Test Your Vocabulary

Slippery Words Quiz—Changing with the Times

  • ducreux self portrait yawning
  • What is an earlier meaning of nice?
True or False

Test your knowledge - and maybe learn something along the way.

TAKE THE QUIZ
Universal Daily Crossword

A daily challenge for crossword fanatics.

TAKE THE QUIZ
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!