black' root' rot"

Plant Pathol.
1. any of several diseases of plants characterized by black or brown lesions on the root.
2. a common disease of the apple caused by the fungus Xylaria mali.
3. a disease of tobacco caused by the fungus Thielaviopsis basicola and characterized by retarded growth and wilting.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

Black Rodblack rot

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