downy mildew

noun

Definition of downy mildew

1 : any of various parasitic lower fungi (family Peronosporaceae) that produce whitish masses of sporangiophores or conidiophores on the undersurface of the leaves of the host
2 : a plant disease caused by a downy mildew

Examples of downy mildew in a Sentence

Recent Examples on the Web Botrytis spores can start on the blooms, and black spot and downy mildew spores can start on the leaves and move on to invade the canes. Nan Sterman, San Diego Union-Tribune, 7 Aug. 2021 Basil downy mildew flourishes in warm, humid environments. Tim Johnson, chicagotribune.com, 26 Aug. 2019 Basil downy mildew affects homeowners with a few basil plants, as well as large-scale commercial growers. Tim Johnson, chicagotribune.com, 26 Aug. 2019 The problem with your basil plants is most likely a disease called downy mildew. Tim Johnson, chicagotribune.com, 26 Aug. 2019 Hops are unhappy in Washington, suffering from the heat, downy mildew and Japanese beetles, to name a few issues. Washington Post, 9 July 2019 Repeat applications of natural horticultural oils or soaps can normally control the mites and thrips but preventing downy mildew is going to take a fungicide. Tom Maccubbin, OrlandoSentinel.com, 23 Dec. 2017 But the problem of downy mildew, which damaged the leaves and vines of the plant, wasn’t such a simple solve. Kat Eschner, Smithsonian, 13 Dec. 2017

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'downy 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 downy mildew

1886, in the meaning defined at sense 1

Learn More About downy mildew

Time Traveler for downy mildew

Time Traveler

The first known use of downy mildew was in 1886

See more words from the same year

Dictionary Entries Near downy mildew

downy haw

downy mildew

downy myrtle

See More Nearby Entries 

Statistics for downy mildew

Cite this Entry

“Downy mildew.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/downy%20mildew. Accessed 30 Nov. 2021.

Style: MLA
MLACheck Mark Icon ChicagoCheck Mark Icon APACheck Mark Icon Merriam-WebsterCheck Mark Icon

More from Merriam-Webster on downy mildew

Britannica.com: Encyclopedia article about downy mildew

WORD OF THE DAY

Test Your Vocabulary

Farm Idioms Quiz

  • cow coming home
  • What does 'poke' refer to in the expression 'pig in a poke'?
Name That Thing

Test your visual vocabulary with our 10-question challenge!

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!