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brown spot
Alternaria
alternata
(Fr.) Keissl.
Host: burley tobacco (Nicotiana tabacum (burley type)
L.)
Descriptor: Symptoms
Description: Symptoms of the brown spot fungus first appear on the lower leaves. Spots are brown with sharply defined margins and may be surrounded by yellow halos. The primary distinguishing characteristics of brown spot are the dark concentric rings within spots that give it a target-like appearance. With magnification, reproductive structures of the casual agent are seen as tufts of black fungal spores (conidia). Under severe conditions, spots are numerous, may coalesce, and give the leaf a ragged appearance as the infected tissue falls out.
Image type: Field
Image location: United States
Photographer Information
Name: R.J. Reynolds Tobacco Company Slide Set
Organization: R.J. Reynolds Tobacco Company
Country: United States
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Image Number: 1440025
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Image Use:(?)
You must attribute the work in the manner specified (but not in any way that suggests endorsement).
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Image Citation:(?) R.J. Reynolds Tobacco Company Slide Set, R.J. Reynolds Tobacco Company, Bugwood.org
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Node Affiliation:
University of Georgia
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Available Images Resolutions:
(Download only - Use Light Box for Requests)
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