The only cause I can think of is that it … Many references out there to checkout. This is by far the most common form of leaf curl and is a growth response to environmental conditions. Many serious tomato diseases, including curly top, mosaic, fusarium and herbicide injury, begin with rolling leaves. Although the leaf roll symptoms are similar to those caused by certain viruses (curly top and tomato yellow leaf curl, for example), the symptoms noted in the PNW in 2009 were likely the result of a disorder on tomatoes called ‘physiological leaf roll.’ Physiological leaf roll starts with upward cupping at the leaf margins followed by inward The good news for tomato growers is that physiological leaf roll has no ill effects on the plant's growth or fruit production. My tomato plants have developed leaf roll and I'm really worried that this is going to affect productivity. I have checked the leaves, there are no purple veins and I don't use herbicides. Reasons Why Tomato Leaves Curl Physiological Leaf Roll Causes: Physiological leaf curl occurs when the tomato plant undergo vigorous top growth coupled with inadequate root growth. Lack of other symptoms (yellowing, parallel veination, lack of vigor, stunting, etc.) A second virus, tomato mosaic virus, causes rolling of leaves, but other symptoms, including mottled-coloring of leaves, small leaflets and internal browning of infected fruit, distinguish it from physiological or herbicide-induced leaf roll. During excessively cool, moist conditions, leaves may roll upward and become leathery in an effort to repel this excessive moisture. Physiological leaf roll Physiological leaf roll on some tomato cultivars is normal and not harmful. Joey Williamson, ©2014 HGIC, Clemson Extension Leaf Roll: Leaf roll of tomatoes may be caused by high temperatures, prolonged periods of wet soil conditions, and drought. Tomato leaf curl or roll may be caused by a variety of reasons. Curled or rolled leaves is a physiological disorder of tomatoes that is often associated with hot dry weather or wind, however it can also occur in response to other stresses like high moisture and nitrogen, fast growth, heavy production, pruning and root damage. Some of these invite more serious consequences than others. A: Rolled tomato leaves can be caused by several things. Leaf roll on tomatoes is not caused by disease and does not affect yield or fruit quality. There is no treatment for virus-infected plants. Removal and destruction of plants is recommended. It can also be a temporary condition caused by weather conditions or by an inconsistent supply of moisture. These include viral infections, physiological factors, chemical injuries, environmental stresses, or a variety of these factors. It is more prevalent in vining tomato plants than bush types. Leaf Curl. While its exact cause may be unknown, it’s believed to be a sort of self-defense mechanism. Tomato foliage exhibiting leaf roll – the upward curing of lower leaves during high temperatures and drought. I’ll summarize them a bit and you can follow the link for all the details. Leaf Curl: I’m seeing one of my plants experiencing tomato plant leaf curl, also known as leaf roll. Another cause of tomato plant leaf curling, also known as leaf roll, is attributed to physiological conditions. The challenge (and honestly a bit of fun for me) is to trouble shoot and hopefully resolve the issue. Tomato leaf roll is not a disease in the normal sense, but a physiological reaction to stress. I'm also very careful with how often I water them. But if your plants are green and no other symptoms appear, it’s probably plain old “tomato leaf roll”.
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