black knot

American  

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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black knot British  

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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Etymology

Origin of black knot

An Americanism dating back to 1835–45

Example Sentences

See Examples For:

black knot

Her hair had been woven then, as now, into a black knot against the nape of her neck.

From "Snow Falling on Cedars: A Novel" by David Guterson

He would remember how rigorously her hair had been woven into a black knot against the nape of her neck.

From "Snow Falling on Cedars: A Novel" by David Guterson

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

From Agriculture for Beginners Revised Edition by Burkett, Charles William

Fig. 46.—Branch of a plum-tree attacked by black knot.

From Elements of Structural and Systematic Botany For High Schools and Elementary College Courses by Campbell, Douglas Houghton

The last group of the Ascomycetes are the “black fungi,” Pyrenomycetes, represented by the black knot of cherry and plum trees, shown in Figure 46.

From Elements of Structural and Systematic Botany For High Schools and Elementary College Courses by Campbell, Douglas Houghton