Host: burley tobacco (Nicotiana tabacum (burley type)
Description: Blue mold can be very devastating to tobacco plants in the bed. Usually, the first symptom of blue mold in the bed is yellowed areas of diseased plants. The leaves of affected plants in these yellowed areas will have a cupped appearance, and the undersides of the leaves will show tell-tale, blue-gray downy fungal growth. Older plants can be deformed and twisted, and the main growing point eventually is killed. Veins in affected areas of twisted leaves are reddish-brown and can become necrotic. On older plants, definite yellow spots with bluish fungal growth on the underside of leaves can occur.
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