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charcoal rot

noun
  1. a disease of plants, especially sorghum, corn, etc., characterized by basal stem lesions and a black discoloration and dry rot of the internal tissues at the base of the stem and upper roots, caused by a fungus, Macrophomina phaseoli.
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018