cedar-apple rust

noun

: a gall-producing disease especially of the apple caused by a rust fungus (Gymnosporangium juniperi-virginianae) that completes the first part of its life cycle on the common red cedar (Juniperus virginiana) and the second on the leaves and fruit of the apple

Examples of cedar-apple rust in a Sentence

Recent Examples on the Web
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Apples are susceptible to several serious diseases, including apple scab, cedar-apple rust, fire blight and powdery mildew. — Beth Botts, Chicago Tribune, 16 Feb. 2025 The fungus that causes cedar-apple rust — so titled because some kinds of junipers are often erroneously called cedars — reproduces more readily in wet spring weather. — Beth Botts, chicagotribune.com, 30 May 2018 Wheat rust needs barberry to survive, cedar-apple rust needs both juniper and an apple relative, and white pine blister rust needs a susceptible member of the currant family. — The Editors Of Organic Life, Good Housekeeping, 21 July 2015

Word History

First Known Use

1946, in the meaning defined above

Time Traveler
The first known use of cedar-apple rust was in 1946

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Cite this Entry

“Cedar-apple rust.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/cedar-apple%20rust. Accessed 5 Oct. 2026.

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