Symptom expression may vary depending on the crop stage at the time of infection, variety and whitefly Physiological leaf curl happens when moisture, nitrogen, temperatures and other environmental stressors damage the plant. Virus-infected plants often show other symptoms of a problem. Characteristic symptoms are white or gray spots on leaves, surrounded by a black or brown margin. Symptoms in tomato plants are the upward curling of leaves, yellow (chlorotic) leaf margins, smaller leaves than normal, plant stunting, and flower drop. Symptoms of tomato yellow leaf curl in a tomato. It causes leaves to twist and curl, and is transmitted between plants by the whitefly. Phew! Infected plants may appear randomly throughout the garden. The tomato leaf curl virus (ToLCV) can attack tomato plants. Tomato plant leaves respond to various stresses by rolling or curling up. A bush variety or the determinate tomato variety is at a lower risk of getting leaf curl. Leaflets are also smaller than those of healthy plants. The stress could either be environmental, biological or chemical related. 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. Often appearing on plants grown under intense light, there is no cause for concern or need for treatment of purple tomato leaves. It is also a problem in many countries that have a Mediterranean climate such as California. With no other symptoms of disease, no treatment is necessary. Control is similar to early blight. Symptoms on the leaves include interveinal yellowing, upward and downward curling and crinkling. Characteristic Symptoms: Tomato plants severely affected by the disease are usually stunted and are unproductive. Whiteflies cause this disease and help it to spread from plant to plant. Tomato Leaf Curl Virus (TLCV) is a disease that causes tomato plants to wither, stop growing fruit, and eventually die. 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. Then it cups upwards and then starts to roll inwards. Leaves may curl up when a plant gets a virus. What Are The Symptoms of Tomato Leaf Curl: The leaf curl is more common in indeterminate tomato varieties. 03: Leaf rolling or curling . 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. One way to prevent the spread of this virus is through the use of insecticides. The curl starts at the leaves that are at the lower position. 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. Tomato Yellow Leaf Curl Virus. If tomato plants are infected early in their growth, there may be no fruit formed. Photo by D. Ferrin, LSU AgCenter, Bugwood.org. Thus, the spread of the virus throughout California must be considered as a serious potential threat to the tomato industry. Tomato leaf curling and rolling is a common matter for tomato gardener. 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. Whiteflies and aphids (Figure 6) both cause leaf yellowing and leave a characteristic sticky excrement called honeydew. This may occur for physiological condition, a side effect of herbicides or viral attack. Viral Infection. 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