Definition of ring rot
1 : decay in a log following closely the annual rings
2a : a disease of sweet potatoes caused by a fungus (Rhizopus stolonifer) in which the roots are girdled by bands of dry rot b : a disease of potatoes caused by a bacterium (Clavibacter michiganensis sepedonicus synonym Corynebacterium michiganensis sepedonicus) and characterized by browning of the ring of vascular bundles —called also ring disease c : brown rot 1c
Join MWU now and get access to America’s largest dictionary, with:
- 300,000 words that aren't in our free dictionary
- Expanded definitions, etymologies, and usage notes
- Advanced search features
- Ad free!
Seen and Heard
What made you want to look up ring rot? Please tell us where you read or heard it (including the quote, if possible).