Host: burley tobacco (Nicotiana tabacum (burley type)
Description: Exposure to high levels of atmospheric pollutants such as ozone may cause tobacco leaves to develop small dark green water-soaked spots. Within 48 hours, the lesions change to a brown color then to grey or white and appear as sunken necrotic areas bordered by chlorotic tissue. Lower leaf surfaces may show no evidence of damage in the early stages. Symptoms may occur at any stage of growth, but most commonly occur during periods of rapid growth. Older leaves are more susceptible. Lesions may coalesce causing the lamina to become necrotic and fall out.
Image type: Field
Image location: United States
Specimen in collection: No
Name: R.J. Reynolds Tobacco Company Slide Set
Organization: R.J. Reynolds Tobacco Company
Country: United States