Leaf Roll Leaf roll of tomato occurs during unfavorable environmental conditions. Leaf roll is characterized by the upward curling of leaflets on older leaves. Rolled leaves may feel firm and leathery. Symptoms may affect up to three-quarters of the foliage although plant growth and fruit production are not significantly altered.
Symptoms are most common when plants have a heavy fruit set.
Persistence And Transmission. Leaf roll of tomato has been associated with varieties having a specific gene that favors this condition. Tobacco mosaic virus can promote leaf roll symptoms on varieties containing this genetic makeup. High temperatures, prolonged periods of wet soil conditions, and drought may promote symptom development. Since damage is minimal, controlling leaf roll is not a major concern.