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sooty mold

noun
  1. Plant Pathology. a disease of plants, characterized by a black, sooty growth covering the affected parts, caused by any of several fungi.
  2. any fungus causing this disease, as molds of the genera Capnodium, Phragmocapnias, and Scorias.
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Origin of sooty mold

First recorded in 1900–05
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018