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Foliar symptoms on tobacco (Nicotiana tabacum)
produced by tomato spotted wilt tospovirus.
Initial symptoms are small necrotic lesions that coalesce with time.
Veinal necrosis is another characteristic symptom.
As the disease progresses, the entire leaf may become necrotic.

Photograph courtesy H. R. Pappu
Department of Plant Pathology, University of Georgia
Coastal Plain Experiment Station, Tifton, GA 31793

Background: Spotted wilt, caused by tomato spotted wilt tospovirus, is the most important pathological constraint to flue-cured tobacco production in Georgia. In 1997, more than 50% of the plants in individual fields in certain counties were diseased. Few management options are available. While transplant date has a profound effect on reducing the impact of the disease, the effect is not consistent from year to year. Because sources of natural host plant resistance are limited, genetically engineered resistance to the virus may offer an effective means of managing the disease.

APS publication number:  IW00004

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