leaf spot

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


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World English Dictionary
leaf spot
any of various plant diseases, usually caused by fungi: characterized by dark lesions on the leaves

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
leaf spot  
Any of various plant diseases resulting in well-defined necrotic areas on the leaves.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Zonate leaf spot is primarily a foliar disease of tomato but has been observed
  infecting stems and fruit.
Bacterial angular leaf spot of strawberry is an important disease in strawberry
  nursery production.
Resistance to bacterial leaf spot and powdery mildew round out the checklist of
  outstanding qualities.
Handsome, dark green, semi-evergreen foliage is resistant to bacterial leaf
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