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.

leaf spot

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

leaf spot

Any of various plant diseases resulting in well-defined necrotic areas on the leaves.

First recorded in 1900–05

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

Some plants exhibit leaf-stalks of ruby red, with central leaf-spot and nerves like in hue, producing the most beautiful effect.

Thus we have "shot-hole fungus," "leaf-spot" and "leaf-blight" as effects of these diseases.

Black walnuts suffer from leaf-spot, blight, or canker, especially in seasons when the trees have been weakened by drought.

In some cases the foliage is attacked by rust fungi and some injury is also done by leaf spot.

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