leaf spot

noun

1. : a discolored area on a leaf caused by parasitic organisms or environmental factors; especially : one having a more or less sharp line of demarcation between it and healthy tissue — compare blotch, mosaic

2. : a disease characterized by discolored often circular spots on the leaves — compare angular leaf spot, leaf blotch

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Plant Pathol.

1. a limited, often circular, discolored, diseased area on a leaf, usually including a central region of necrosis.

2. any disease so characterized.

[1900-05]

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leaf spot noun

Any of several plant diseases characterized by the appearance of dark spots on the leaves

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Main Entry: ↑leaf

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leaf spot,

1. any one of various plant diseases caused by fungi or bacteria which create discolorations on leaves.

2. the blemish on leaf surfaces caused by leaf spot.

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n. [usu. with adj.] any of a large number of fungal, bacterial, or viral plant diseases that cause leaves to develop discolored spots