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Damage on Young Plant. A large tomato plant can survive damage better than a young plant, but even a small plant can recover from a broken upper stalk. If the stalk, or stem, is damaged under the lowest branch, however, the plant will not survive.
Environmental stress from bouts of cool rainy weather, herbicide damage, severe pruning, sucking insects and viruses tend to cause tomato leaves to curl. Yo-yo watering and severe pruning may cause a tomato plant temporarily to develop thick, leathery leaves that curl upwards. In this case, the plant shows no effects on flowering, fruiting or growth. The plant should re-adjust within the week. <br /><br /><b>Herbicide damage</b>, particularly from <b>2,4-D</b>, may cause tomato leaves to curl first downwards and then upwards. In this case, the plant may show such effects as cat-faced fruit, stunted growth and twisted leaves.