You know what it looks like… but what is it called?
TAKE THE QUIZ“red-brown”
The following 2 entries include the term red-brown.
red-brown butt rot
noun: a destructive butt and root rot of various conifers caused by a pore fungus (Polyporus schweinitzii)
red-brown rot
noun: a fungal decay of conifers and various deciduous plants caused by a pore fungus (Fomes pinicola)
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Merriam-Webster unabridged