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weather fleck
Host: dark tobacco (Nicotiana tabacum (dark type)
L.)
Descriptor: Symptoms
Description: Dark tobacco. Note "ring spot" on the leaves. This “ring spot” (also known as "star and crescent spot") which has the form of a necrotic spot encircled by alternating rings of healthy and injured tissue, with the necrotic rings being partial rings or broken lines, is described in an Agronomy Journal of 1971 as physiological in cause (not being caused by a pathogen, air pollutant, nutrient, or chemical). The book "Diseases of Tobacco" 3rd edition, puts this "ring spot" and the reference that says it is not caused by an air pollutant, under the category of weather flecking.We have sent similar samples in the past to a private laboratory for a tobacco virus screen and they have always come back with negative results.
Image type: Laboratory
Image location: Kentucky, United States
Photographer Information
Name: Paul Bachi
Organization: University of Kentucky Research and Education Center
Country: United States
Series:Weather fleck (high levels of atmospheric pollutants such as ozone) on Tobacco (Nicotiana tabacum)
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Image Number: 5368861
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Image Citation:(?) Paul Bachi, University of Kentucky Research and Education Center, Bugwood.org
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Node Affiliation: Bugwood - UGA
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