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hawthorn rust

noun
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Definition of hawthorn rust

: a rust fungus (Gymnosporangium globosum) in its aecial and pycnial stage

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“Hawthorn rust.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/hawthorn%20rust. Accessed 5 Mar. 2021.

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