onion mildew

noun

Definition of onion mildew

1 : a downy mildew of the onion
2 : a fungus (Peronospora destructor) that causes onion mildew

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Cite this Entry

“Onion mildew.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/onion%20mildew. Accessed 15 Aug. 2020.

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