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Meaning of southern blight

south'ern blight'

Pronunciation: [key]
— Plant Pathol. Plant Pathol.
  1. a disease of peanuts, tomatoes, and other plants, caused by a fungus, Sclerotium rolfsii, affecting the roots and resulting in rapid wilting.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.