What is one outcome of Grape fanleaf nepovirus infection in grapevines?

The outcome of Grape fanleaf nepovirus infection in grapevines is characterized by reduced growth. This viral infection negatively impacts the physiological functions of the plant, leading to stunted growth and diminished vigor. Infected grapevines often exhibit symptoms such as leaf curling, yellowing, and reduced leaf size, all of which contribute to the overall decline in plant health and productivity.

In contrast to the other options, which imply beneficial effects or improvements in the grapevines, the reality of Grape fanleaf nepovirus infection is a detrimental influence on the plant's growth. Such pathogens can compromise nutrient uptake and overall metabolic processes within the vine, resulting in lower biomass and fruit yield. Therefore, recognizing reduced growth as a consequence of this virus aligns with the known effects of plant viral infections on agricultural crops.