What is a common symptom of Cucumber mosaic cucumovirus?

Cucumber mosaic cucumovirus (CMV) is well known for producing a specific set of symptoms in infected plants, particularly cucumbers and related crops. One of the hallmark symptoms is the mosaic pattern on the leaves. This mosaic pattern appears as a combination of light and dark green areas on the foliage, caused by the virus's interference with normal cell function and chlorophyll production.

This visual symptom is significant for identification because it provides a clear indicator of viral infection, helping growers and pest control advisers to diagnose the problem quickly. While leaf curling and stunted growth can occur due to various stress factors, they are not unique to CMV and can be attributed to other pests or environmental conditions. The black spot on fruit is also not associated with this virus; instead, it's often linked to different diseases or pests. Thus, recognizing the mosaic pattern on leaves is crucial for diagnosing CMV and implementing appropriate management strategies.