ring rot

WordReference Random House Unabridged Dictionary of American English © 2026

ring′ rot′, [Plant Pathol.]

1. Plant Diseases a disease of potatoes, characterized by wilted foliage and rotting of the ring of vascular bundles in the tubers, caused by a bacterium,
   Corynebacterium sepedonicum.

• 1900–05, American.

Collins Concise English Dictionary © HarperCollins Publishers::

ring rot noun

1. a virulent bacterial disease of potatoes occurring in the vascular ring of the potato tuber
   Also called: potato ring rot