patches of disease or other damage on plant foliage.
Merriam-Webster Online Dictionaryleaf spot (noun)
any of various plant diseases characterized by discolored often circular spots on the leaves
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leaf spot (Wikipedia)
Leaf spot caused by Cercospora capsici
|Causal agents||fungi or bacteria|
Leaf spots are round blemishes found on the leaves of many species of plants, mostly caused by parasitic fungi or bacteria.
A typical spot is "zonal", meaning it has a definite edge and often has a darker border. When lots of spots are present, they can grow together and become a blight or a blotch. Fungal spots are usually round or free-form in shape.
In most cases, leaf spots are considered to be only a cosmetic problem, but they can have economic effects on nurseries or in floriculture.