frosty mildew

noun

Definition of frosty mildew

: a leaf spot of various plants caused by fungi of the genus Cercosporella and characterized by pale to white usually circumscribed lesions on affected foliage

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“Frosty mildew.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/frosty%20mildew. Accessed 30 Nov. 2020.

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