leaf spot

nounPlant Pathology.

a limited, often circular, discolored, diseased area on a leaf, usually including a central region of necrosis.
any disease so characterized.

Origin of leaf spot

First recorded in 1900–05

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2024

How to use leaf spot in a sentence

Carnations are subject to several diseases, the worst being the “rust” (Uromyces Caryophilinus), “leaf-spot” and maggot.
Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 3 | Various
Some plants exhibit leaf-stalks of ruby red, with central leaf-spot and nerves like in hue, producing the most beautiful effect.
Tropic Days | E. J. Banfield
Thus we have "shot-hole fungus," "leaf-spot" and "leaf-blight" as effects of these diseases.
The Cherries of New York | U. P. Hedrick
Black walnuts suffer from leaf-spot, blight, or canker, especially in seasons when the trees have been weakened by drought.
Northern Nut Growers Association Thirty-Fourth Annual Report 1943 | Various
In some cases the foliage is attacked by rust fungi and some injury is also done by leaf spot.
Northern Nut Growers Report of the Proceedings at the Twenty-First Annual Meeting | Northern Nut Growers Association

British Dictionary definitions for leaf spot

leaf spot

noun

any of various plant diseases, usually caused by fungi: characterized by dark lesions on the leaves

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

Scientific definitions for leaf spot

leaf spot

Any of various plant diseases resulting in well-defined necrotic areas on the leaves.

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