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

See Examples For:

leaf spot

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 ● Jun. 9, 2022

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 ● May 30, 2022

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

From Salon ● May 18, 2022

Two of the most common fungal diseases may, at first glance, look similar — and you may even have them both: Alternaria, or early blight, and Septoria leaf spot.

From Seattle Times ● Jul. 26, 2021

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

From Northern Nut Growers Report of the Proceedings at the Twenty-First Annual Meeting Cedar Rapids, Iowa, September 17, 18, and 19, 1930 by Northern Nut Growers Association