ozone (  ) on burley tobacco (Nicotiana tabacum (burley type)) - 5424468

ozone

Host: burley tobacco (Nicotiana tabacum (burley type) L.)
Descriptor: Damage
Description: The spots usually start as small dark green water-soaked areas. Within 48 hours, the lesions change to a brown color then to a gray or white and appear as sunken necrotic areas bordered by chlorotic tissue (on dark  tobacco you usually do not see any yellow halo). The spots are often concentrated along the side of the midrib and  large secondary veins but can be found anywhere on the leaf. On expanding leaves the spots appear near the tip. Lower leaf surfaces may show no evidence of damage in the early stages. Lesions may run together causing the leaf surface to become necrotic and fall out. Symptoms may occur at any growth stage, but most commonly occur during periods of rapid growth. Older leaves are more susceptible.Dark tobacco types usually show less injury than burley types when at the same growth stage and exposed to the same level of ozone.
Image type: Field
Image location: United States

Photographer Information

Name: William C. Nesmith
Organization: University of Kentucky Research and Education Center
Country: United States

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Image Number: 5424468

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Image Citation:(?) William C. Nesmith, University of Kentucky Research and Education Center, Bugwood.org

Node Affiliation: University of Georgia

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Image uploaded on Friday, July 23, 2010
Image Information last updated on Friday, April 08, 2011