patches of disease or other damage on plant foliage.
leafspot (Wikipedia)
| Leaf spot | |
|---|---|
 Leaf spot caused by Cercospora capsici | |
| Causal agents | fungi or bacteria |
| Hosts | plants |
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.