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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?

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Some varieties of tomato develop a 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. 

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Fluctuating soil moisture, excessive heat, or heavy 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, and avoid heavy pruning of your tomatoes.

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