The plant becomes stunted, and leaflets curl and grow increasingly smaller, exhibiting a puckered appearance. It is caused by whitefly infestations on the tomato plants. According to Wikipedia, tomato yellow leaf curl virus is found in tropical and subtropical regions. Whiteflies and aphids (Figure 6) both cause leaf yellowing and leave a characteristic sticky excrement called honeydew. Tomato Yellow Leaf Curl Virus. 03: Leaf rolling or curling . Tomato yellow leaf curl (virus: tomato yellow leaf curl virus , TYLCV) is one of the most devastating virus diseases of tomatoes, and total yield loss has been reported when vector populations were high. Leaf curl can be quite frustrating to deal with as multiple conditions can cause it or a combination of any and the only way to deal with it is by identifying the exact cause. One way to prevent the spread of this virus is through the use of insecticides. Remedies for leaf curl in tomato plants ( Lycopersicon esculentum ) depend on the cause of the curling leaves.Tomato yellow leaf curl virus is one possible cause, but your tomato growing practices could also cause the leaves to curl. Phew! Purple leaves are caused by expression of anthocyanin due to light exposure. Tomato leaf curling and rolling is a common matter for tomato gardener. The curl starts at the leaves that are at the lower position. Virus-infected plants often show other symptoms of a problem. Unfortunately, there is no cure for TLCV, so the only answer is removing infected … Thus, the spread of the virus throughout California must be considered as a serious potential threat to the tomato industry. Symptoms in tomato plants are the upward curling of leaves, yellow (chlorotic) leaf margins, smaller leaves than normal, plant stunting, and flower drop. Characteristic Symptoms: Tomato plants severely affected by the disease are usually stunted and are unproductive. You have to take precautions after finding out the main cause of the leaves rolling. Leaves may curl up when a plant gets a virus. Often appearing on plants grown under intense light, there is no cause for concern or need for treatment of purple tomato leaves. The tomato leaf curl virus (ToLCV) can attack tomato plants. Tomato leaf curl is often an environmental change due to stress. A bush variety or the determinate tomato variety is at a lower risk of getting leaf curl. Tomato Leaf Curl Virus (TLCV) is a disease that causes tomato plants to wither, stop growing fruit, and eventually die. This may occur for physiological condition, a side effect of herbicides or viral attack. The stress could either be environmental, biological or chemical related. What Are The Symptoms of Tomato Leaf Curl: The leaf curl is more common in indeterminate tomato varieties. Tomato yellow leaf curl virus is undoubtedly one of the most damaging pathogens of tomato, and it limits production of tomato in many tropical and subtropical areas of the world. Infected plants may appear randomly throughout the garden. With no other symptoms of disease, no treatment is necessary. Symptoms on the leaves include interveinal yellowing, upward and downward curling and crinkling. Characteristic symptoms are white or gray spots on leaves, surrounded by a black or brown margin. Whiteflies cause this disease and help it to spread from plant to plant. If tomato plants are infected early in their growth, there may be no fruit formed. Control is similar to early blight. It causes leaves to twist and curl, and is transmitted between plants by the whitefly. Photo by D. Ferrin, LSU AgCenter, Bugwood.org. Symptom expression may vary depending on the crop stage at the time of infection, variety and whitefly Then it cups upwards and then starts to roll inwards. 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