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black knot

noun Plant Pathology.
  1. a disease of plants, especially of plums and cherries, characterized by black knotlike overgrowths on the branches, twigs, etc., caused by a fungus, Dibotryon morbosa.
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Origin of black knot

An Americanism dating back to 1835–45
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for black knot

Historical Examples of black knot

  • Happily, black-knot may be controlled by cutting out the diseased wood.

    The Cherries of New York

    U. P. Hedrick

  • The branches are very liable to disfigurement by the black-knot and the foliage by the tent-caterpillar.

  • The fungus is also related to the black-knot fungus on the plum, but its life-history is not yet known.

British Dictionary definitions for black knot

black knot

noun
  1. a fungal disease of plums and cherries caused by Dibotryon morbosum, characterized by rough black knotlike swellings on the twigs and branches
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012