powdery mildew


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

Examples of powdery mildew in a Sentence

Recent Examples on the Web Protect –To control powdery mildew, spray off foliage early in the morning to remove fungus spores with a solution of 1 tablespoon baking soda, ½ teaspoon Castile soap, and 1 gallon of water. Kristin Guy, Sunset Magazine, 12 Mar. 2024 Fungicide levels were high For the first time, EWG analysts looked at reported levels of fungicides, one form of pesticide used to kill fungal diseases such as powdery mildew. Sandee Lamotte, CNN, 20 Mar. 2024 If so, that boost of humidity is just enough moisture to aid in the germination of powdery mildew spores that then infect the leaves. Miri Talabac, Baltimore Sun, 1 Feb. 2024 Cucumbers and other vining fruits and veggies, such as squash, small melons, and snap peas, grow on trellises, both for space efficiency and because air circulation discourages disease, including powdery mildew. Elizabeth Jardina, Better Homes & Gardens, 20 July 2023 Minor diseases like powdery mildew or nuisance pests like aphids are less of a concern, but more substantial diseases like downy mildew and pests like allium leaf miner are best managed with prevention. Miri Talabac, Baltimore Sun, 7 Sep. 2023 Neem oil can effectively ward off a variety of indoor and outdoor plant pests as well as fungal diseases including powdery mildew and leaf spot. Kate McGregor, House Beautiful, 10 July 2023 Leaves with a powdery white coating have been infected with powdery mildew. Southern Living Editors, Southern Living, 11 Sep. 2023 Many fungicides are labeled for powdery mildew suppression; follow their directions. Miri Talabac, Baltimore Sun, 24 Aug. 2023

These examples are programmatically compiled from various online sources to illustrate current usage of the word 'powdery mildew.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.

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

Dictionary Entries Near powdery mildew

Cite this Entry

“Powdery mildew.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/powdery%20mildew. Accessed 22 Apr. 2024.

Kids Definition

powdery mildew

: 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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