What is causing the leaves on my tomato plant to curl and roll up?

The leaves on my tomato plant are curled and rolled up. I don't see any bugs or leaf spots. What's causing this?
Submitted by BHGPhotoContest

Some varieties of tomato develop physiological leaf roll. 'Beefsteak', 'Big Boy', and 'Floramerica' are three susceptible varieties. The margins of leaves roll inward toward the central vein, and leaflets become leathery. Fluctuating soil moisture, excessive heat or pruning are the usual causes. The problem is mostly cosmetic. Tomato yields are unaffected. If you'd like to avoid the problem, grow a variety that is less susceptible to leaf roll. Maintain consistent soil moisture by mulching and watering as necessary. Avoid heavy pruning of your tomatoes.

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sorry thought i was asking a question, disregard above thanks
Submitted by hoonia_jr
sorry thought i was asking a question, disregard above thanks
Submitted by hoonia_jr
signs of over watering tomatoes
Submitted by hoonia_jr