black ring

noun
variants: less commonly

black ring spot

Definition of black ring

  1. 1 :  a virus disease of cabbage and other members of the cabbage family (Cruciferae) that is characterized by necrotic, dark, and often sunken rings on the leaf surface

  2. 2 :  a virus disease of the tomato that is characterized in its initial stage by numerous small black rings on young leaves

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