leaf spot

American  

noun

Plant Pathology.

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

2. any disease so characterized.

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leaf spot British  

noun

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

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leaf spot Scientific  

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

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Etymology

Origin of leaf spot

First recorded in 1900–05

Example Sentences

A: This is viburnum leaf spot and it is quite common.

From Seattle Times

Discuss diseases and insect pests common to roses grown in the maritime Pacific Northwest, including black spot, rust, cercospora leaf spot, powdery mildew, crown gall, cankers, rose mosaic virus and more via Zoom 6:30-8:15 p.m.

From Seattle Times

Other common ailments are Alternaria leaf spot, white mold, bean rust, and mosaic virus, which can be avoided by keeping leaves dry and trellising or pruning to allow maximum airflow between vines.

From Salon

Bacterial leaf spot, or basil shoot blight, is a major uh-oh when it comes to pathogens.

From Salon

I am seeing fungal leaf spot diseases on dogwood trees, for example, and I’m hearing reports of the blackening and death of tomato plants, perennials and annuals.

From Washington Post