Celery mosaic virus

Celery mosaic virus (CeMV) is a plant pathogenic virus in the genus Potyvirus and the family Potyviridae. In California, mosaic diseases of celery (Apium graveolens) were reported as early as 1922. After some time, it became clear that there were at least two different viruses causing mosaic diseases with similar symptoms in celery. These two viruses were first differentiated by host range. One of the viruses had a wide host range and was named Southern celery mosaic. The second had a host range restricted to the family Umbelliferae (Apiaceae) and was called Western celery mosaic. Continued research showed that the Southern mosaic virus was actually an isolate of Cucumber mosaic virus and Western celery mosaic eventually became known simply as Celery mosaic virus.

from Wikipedia