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leaf spot

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

Historical Examples

  • Mr. Durand: What is the best spray for leaf-spot and rust in strawberries?

    Trees, Fruits and Flowers of Minnesota, 1916

    Various

  • 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.

  • Carnations are subject to several diseases, the worst being the “rust” (Uromyces Caryophilinus), “leaf-spot” and maggot.


British Dictionary definitions for leaf spot

leaf spot

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

leaf spot in Science

leaf spot

  1. Any of various plant diseases resulting in well-defined necrotic areas on the leaves.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.