Tomato Leaf Roll
The following question was sent to the P&PDL diagnosticians here at Purdue University:
Question: Last year the leaves on my tomato plants curled. I don't know if it has anything to do with it or not, but during the month prior to the curled leaves, we had a lot of rain. What do you think the problem is? What should I do to prevent the problem next year
Answer: The following answer was provided by By Bev Netzhammer, Advanced Master Gardener, Purdue University, as she answered a similar question.
Many tomato diseases, including curly top, mosaic, and fusarium, begin with rolling leaves. But if no other symptoms appear, it's probably (aptly named!) tomato leaf roll. It's a temporary disorder resulting from excessively wet soil, especially after heavy rains. It doesn't affect the plant's growth, and a normal crop of fruit is produced. The rolling disappears in a few days when the soil dries out. 'Big Boy', 'Floramerica' and 'Beefsteak' are affected most often.