Which symptom is commonly seen in plants affected by Grape fanleaf nepovirus?

The symptom commonly associated with Grape fanleaf nepovirus is reduced yield. This virus significantly affects the productivity of grapevines by causing various physiological disruptions, leading to stunted growth and lower fruit production. Infected plants often exhibit overall vigor loss, which directly impacts their ability to produce fruit.

While other symptoms like leaf curling can occur with different plant pathogens or environmental factors, reduced yield is the hallmark of Grape fanleaf nepovirus infections. This issue is particularly critical for grape growers, as the primary economic concern with the virus is the diminished harvest, making it the most significant and recognizable symptom of this infection.