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grease spot

noun
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Definition of grease spot

: a disease of turf grasses caused by a fungus (Pythium aphanidermatum) and characterized by spots usually under two inches in diameter but often coalesced into patches or streaks having a distinctive greasy border of blackened leaves and intermingled cottony mycelium

— called also spot blight

— compare dollar spot

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“Grease spot.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/grease%20spot. Accessed 2 Jul. 2022.

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