Which leaf symptom is typical of Fanleaf Degeneration?

Which leaf symptom is typical of Fanleaf Degeneration?

• A. Spots on leaves
• B. Leaves malformed resembling fans with yellow bands around the veins
• C. Wavy edges
• D. Purplish color

Answer: (B)

Fanleaf Degeneration is a grapevine viral disease whose most recognizable leaf symptom is leaves that are deformed into a fan shape, often with yellow bands running along the veins. This distinctive distortion arises because the virus disrupts normal leaf development, producing the characteristic lobes and vein-associated yellowing. Other leaf changes listed—spots, wavy edges, or purplish coloration—can result from different diseases, stress, or nutrient issues and are not typical of this virus. Therefore, leaves that look like a fan with yellow bands along the veins best match the symptom profile of fanleaf degeneration.

Fanleaf Degeneration is a grapevine viral disease whose most recognizable leaf symptom is leaves that are deformed into a fan shape, often with yellow bands running along the veins. This distinctive distortion arises because the virus disrupts normal leaf development, producing the characteristic lobes and vein-associated yellowing. Other leaf changes listed—spots, wavy edges, or purplish coloration—can result from different diseases, stress, or nutrient issues and are not typical of this virus. Therefore, leaves that look like a fan with yellow bands along the veins best match the symptom profile of fanleaf degeneration.