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black root rot

noun, Plant Pathology
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.
Origin
1905-1910
1905-10
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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