Tomato leaf mold is a foliar disease first described by Cooke (1883). Foliage is usually the only tissue affected. Disease symptoms first appear after seven days as pale green or yellowish spots without well-defined margins on the upper leaf surface which turn a distinctive yellow. Lesions coalesce when the disease is severe and the foliage dies. An olive, green mold on the lower leaf surface is visible. Infected foliage curls and withers and may drop from the plant. Blossoms, stems, and fruit are occasionally attacked and blossoms may be killed. Fruit symptoms consist of a dark, leathery rot at the stem ends.