black knot

A disease of the plum, the cherry, and related plants caused by the fungus Apiosporina morbosa and resulting in black knotlike swellings on the branches.

American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

black knot

(Plant Pathology) 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 and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

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Noun

black knot - disease of plum and cherry trees characterized by black excrescences on the branches

plant disease - a disease that affects plants

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plant disease

References in classic literature

And then, within thirty yards of the pit, advancing from the direction of Horsell, I noted a little black knot of men, the foremost of whom was waving a white flag.

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Black knot is used to define discrete variable and quantum operations, variable significance represented by any black knot being discrete form of sum transformation of all variables, being in the knot, according to a certain rate.

Formation of Equivalent Models of Structured Multirate Systems in the Form of Signal Graph

The lawyers boycotted courts and tied black knot on their arms as a protest and hoisted black flags at bar associations.

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They are susceptible to black knot, a black bubble gum like fungus that wraps itself around branches and can kill a tree.

Grow America's best fruit: apples, peaches, pears and plums: Fruit experts name the best-tasting and easiest-to-grow varieties

This species is highly susceptible to the pathogenic fungus commonly known as black knot disease.

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* Pin knot--Small black knot (diameter < 3.2 mm).

Detection capabilities of automated hardwood lumber defect-detection systems

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They are susceptible to black knot, a black bubblegumlike fungus that wraps itself around branches and can kill a tree.

Grow America's best fruit: apples, peaches, pears and plums: fruit experts name the best-tasting and easiest-to-grow varieties. (garden & yard)

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