onion smut


Definition of onion smut

1 : a fungus disease of the onion that is especially destructive to seedlings and is characterized by elongate blackish blisters on the scales and leaves
2 : the fungus (Urocystis cepulae) that causes onion smut

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Cite this Entry

“Onion smut.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/onion%20smut. Accessed 6 Aug. 2020.

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