|CMV on chile pepper (Photo: NMSU-PDC)|
|CMV on tomato (Photo: NMSU-PDC)|
Unfortunately, CMV doesn’t produce unique symptoms and diagnosis based solely on visual observations is risky. Many other viruses produce similar symptoms. Likewise, some herbicides may cause look-a-like damage. Whether or not there has been an herbicide application on or near affected plants is an important consideration in distinguishing between a virus disease and herbicide damage. The number of plants affected may also be a clue to the cause. Typically, a virus will affect a relatively small number of plants whereas herbicide injury may be more wide-spread. A laboratory test can confirm infection by CMV and/or other plant viruses.