- 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. 2018
Examples from the Web for leaf spot
Mr. Durand: What is the best spray for leaf-spot and rust in strawberries?
Black walnuts suffer from leaf-spot, blight, or canker, especially in seasons when the trees have been weakened by drought.
Mosaic disease, Frog-eye or Leaf-spot are probably bacterial diseases.Tobacco Leaves
W. A. Brennan
Thus we have "shot-hole fungus," "leaf-spot" and "leaf-blight" as effects of these diseases.The Cherries of New York
U. P. Hedrick
Carnations are subject to several diseases, the worst being the “rust” (Uromyces Caryophilinus), “leaf-spot” and maggot.
- 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
- Any of various plant diseases resulting in well-defined necrotic areas on the leaves.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.