Tobacco ringspot virus results in chlorotic (yellow) and necrotic (brown) rings on foliage. Symptoms may occur predominantly on one side of a plant. (Photo: William Nesmith, UK)

The typical chlorotic and necrotic ring symptom, as shown here, gives tobacco ringspot its name. (Photo: Kenneth Seebold, UK)

An "oak-leaf" pattern is also commonly observed on plants infected with tobacco ringspot virus. (Photo: Cheryl Kaiser, UK)