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black knot

noun, Plant Pathology.
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.
Origin of black knot
An Americanism dating back to 1835-45 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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Examples from the Web for black knot
Historical Examples
  • black knot is a serious disease of the plum and of the cherry tree.

    Agriculture for Beginners Charles William Burkett
  • The diseases known as black knot and peach curl are thus caused.

    A Civic Biology George William Hunter
  • Give me a knife, Nora, the string's perished with the salt water, and there's a black knot on it you wouldn't loosen in a week.

    Riders to the Sea J. M. Synge
  • The black knot is best kept in check by cutting out the knots whenever they can be seen, and burning them.

  • There are four leading difficulties in the growing of Plums—leaf blight, fruit rot, black knot, and curculio.

  • Well, I 'm sure I wish you would, if you 're any good at a black knot; my heart and my nails are both broke with one here.

  • All black knot should be cut out and burned some time before February of each year.

    Agriculture for Beginners Charles William Burkett
  • Now he was spurring the horses to a fine lather, for he could see the grooms in a black knot by the White Horse cellars.

    The Passionate Elopement Compton Mackenzie
  • The tree is sick; sick with a patching disease of trees called the black knot.

    Natural Wonders Edwin Tenney Brewster
  • Suddenly the black knot of warriors dashed into the obstruction, brandishing spears and clubs, and screaming like maniacs.

    Brothers of Peril Theodore Goodridge Roberts
British Dictionary definitions for black knot

black knot

a fungal disease of plums and cherries caused by Dibotryon morbosum, characterized by rough black knotlike swellings on the twigs and branches
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
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