Once again we’re seeing quite a bit of leaf roll in tomatoes this year. This is a physiological problem that has been attributed to a number of causes, including excessive nitrogen, excess moisture and extended periods of warm dry weather as we transition from spring to summer. Certain varieties tend to be affected more than others, and indeterminate varieties seem to be more prone to the condition than determinate varieties. The good news is that it doesn’t really hurt production.
Donald M. Ferrin, Ph.D., Louisiana State University Agricultural Center, Baton Rouge, LA