If the leaves on your tomato are yellow or brown, twisted or coiled, or if they are curling up, the issue may be environmental, chemical, or biological. Sometimes all of a plant's leaves are twisted or curled; other times, only new growth displays symptoms, while older leaves remain unaffected. Damage may begin modestly before rapidly affecting fresh growth. Causes of damage to tomato and other vegetable plants may be singular or several. 
There are five basic causes for twisted or curled tomato leaves:
- Wind damage
- Herbicide drift
- Herbicide residue
- Broad mite
- Tomato viruse
Last week, while walking around my garden, I observed that a few tomato leaves were curling. I quickly realized that this was most likely due to the extraordinarily hot weather we were having, and that I may have neglected to water the plants before our trip to the lake. With additional watering and lower temps, my tomato plant's leaves eventually uncurled and returned to normal, although I am aware that this is not always the case. Last year, tomato leaves curled for a different reason: a lack of micronutrients. If you observe that the leaves of your tomato plants are curling upward, the following are some typical explanations. WHY ARE THE LEAVES OF MY TOMATOES CURLING UP? Environmental factors account for the majority of instances in which tomato leaves curl. This might indicate that your tomatoes are exposed to excessive heat or sunlight. Too much wind can also cause tomato leaves to curl, causing stress to your plants. If your plants are not properly maintained and staked, they may twist, causing the leaves to curl and die. Consider tomato leaves as little solar panels that absorb sunlight for the plant. If the plant receives an abundance of sunshine, the leaves will curl and close to prevent sunburn.
tomato leaves curling
Leaves curling is one of the most prevalent issues that can affect tomato plants. This issue, commonly known as leaves roll, causes many novice tomato growers concern. However, there is typically no cause for panic. 
The majority of leaves curling reasons are connected to stress. Stress isn't ideal for plants, but it's not lethal and typically doesn't have a lasting effect on production. Once you have discovered the issue and implemented the solution, your plants should return to normal. Other causes of leaf curl are more difficult to remedy. Herbicide exposure and viral illness are far less prevalent, but significantly more destructive to plants. You may obtain a lower yield, no yield, or even a dead plant. Prior to taking action, it is essential to determine the precise reason of your tomato leaf curl due to the wide range of severity. Consider these seven frequent causes. Your issue is probably easier to resolve than you believe. Improper Watering: Obviously, irrigation is essential for all plants, but this is especially true for tomatoes. The plants require a plenty of water, particularly for the development of delicious fruits. Due of the necessity of watering for tomato plants, they may be rather finicky when improperly watered. Both underwatering and overwatering can stress plants. Underwatering prevents the plant from functioning properly; overwatering causes root damage, preventing the plant from functioning properly. It is believed that the tension caused by these circumstances causes the leaves to curl inwards. Although overwatering is a potential cause, other symptoms are likely to appear even before the leaves curl. Underwatering is by far the most probable cause. 
When the soil is not routinely watered, water cannot be transferred to the plant cells, hence preventing the plant from becoming stiff. The leaves begin to curl inward to minimize further water loss due to solar exposure.
leaf curl tomato
One reason that the leaf of tomato curls is because tomato plant pruning is too much. While some claim it is important, others argue that it is harmful. Regardless of your position, you may rest assured that overpruning is never a wise idea. Leaf curl is one of the issues it might create. Pruning your tomato plants too much might cause the leaves to curl, as we've discovered. It also exposes more of the plant to the light, making it more vulnerable to the heat issues that were previously described. Pinch the suckers between the main stem and the lateral stems of indeterminate tomato plants to encourage new growth. The removal of only a few leaves can also help with growth and airflow. Pruning, on the other hand, necessitates moderation. Pruning determinate tomato plants is a waste of time and effort. Leave it alone if your plant has just undergone a grueling trimming operation. While the plant is still fragile, any more needless contact with it might result in further harm. 
The leaves should revert to their usual state after a few weeks. Transplant shock is likely to blame if you detect leaf curl in a newly transplanted tomato. There's always a possibility of root injury when tomato plants are relocated. Tomato roots are extremely sensitive. It's possible to cause root damage even with the tiniest of nicks. As the plant adapts to its new location, it may display indications of root damage, such as wilting, yellowing leaves, and leaf curl. It is fortunate that moderate transplant shock is not harmful. A little patience is all you need, much as with other environmental concerns. In a matter of weeks, the plants will go back to normal.
yellow spots on tomato leaves
Tomato plants are one of the most prevalent fruits in the world, and many cultures regard them as a delicacy. Tomato plants, on the other hand, are susceptible to disease. If you see yellow spot color changes in your tomato plant's leaves, it's likely that your plant is infected. Tomato leaves with yellow spots: Seeing yellow spots on the leaves of your tomato plant might mean that your plant is suffering from a disease, or that you need to make some changes to the care you're giving it. Using fungicides, fertilizer, or repotting your plant may frequently alleviate this problem. Yellow spots on tomato leaves: what causes them? 
Tobacco Mosaic Virus Plant virus Tobacco Mosaic Virus (TMV) causes your tomato plant's leaves to become a pale yellow or brown color. The yellow areas of discolouration on the leaves sometimes appear to form a little mosaic design. TMV affects both the plant and the fruit, unlike most other tomato diseases. The tomato fruit's skin will develop light brown spots if it is infected. Due of its similar symptoms to those of nutrient shortage and overwatering, the virus is frequently confused for other conditions. In light of how quickly the virus may spread to other plants, this could be a problem. As a result of its great environmental tolerance, the virus may survive on plant seeds for months or even years. There is a lack of nutrients. The yellow patches on the leaves of tomato plants might be caused by a shortage of nutrients. Most store-bought tomato fertilizers include the NPK nutrients, which are critical for tomato plants. Leaf yellowing is most commonly caused by a lack of nitrogen and potassium. 
The yellowing of older, more mature leaves is a telltale symptom of a nitrogen deficit in your plant. Occasionally, the leaves can become a brilliant white yellow. Your tomato plant's growth will then stall, and some leaves may not develop at all, remaining slender and spindly in their appearance.
tomato leaves curling down
Extreme heat causes the leaves of tomato to become curling down. In tandem with drowning, high heat is the underlying reason. This issue is also caused by a shortage of water, although it may not be completely the gardener's responsibility. Tomatoes may struggle to adapt in the summer, when the weather begins to heat up and the sun gets more intense. Despite the fact that tomatoes are sun-loving plants, they experience heat stress when temperatures remain continuously over 85 degrees Fahrenheit. Increased temperatures accelerate stomatal transpiration, the process by which plants lose water via their leaves. Once more, the leaves curl inward to shield the plant from the sun and prevent more water loss. There are several methods for protecting plants from extreme heat. You may install shade fabric to shield your plants from the sun during the warmest part of the day, leaving them exposed in the morning and late afternoon. When tomatoes are grown in pots, it is much simpler to relocate them to a shadier location. 
Alternately, you can wait for the heat to dissipate before it causes irreparable harm. The leaves should return to normal as the temperature drops. When planting tomatoes for the first time, it is ideal to use a fertilizer with a balanced ratio of nitrogen, phosphate, and potassium. However, as the plant reaches maturity and begins to produce fruit, phosphorus and potassium fertilizer is advised since these nutrients are essential for blooming and fruiting. An application of excessive nitrogen at this point might result in leaf issues, including curling. When the soil has an excessive amount of nitrogen, the plant prioritizes leaf formation. When the plant is developing fruit, however, this peculiar emphasis on the leaves leads them to grow brilliantly green, thick, leathery, and rolled. Typically, excess nitrogen issues resolve themselves over time. As leaf curl has little effect on the yield or overall health of the plant, there is no need to apply a treatment; simply wait for the leaves to return to normal.
tomato yellow leaf curl virus
Tomato yellow leaf curl virus (tylcv) has recently been the subject of a great deal of media attention (TYLCV). I t is possible that this illness invaded Florida from the Caribbean this spring in the form of sick plants, plants that host infective whiteflies, or whiteflies that carry the virus. What is TYLCV, and how is it used? More than a dozen plant viruses can infect tomatoes in around the world, including those grown in home gardens as well as those used for commercial production. Plants infected early on have less fruit yield than later on because of TYLCV's strong impact, which is unlike the other viruses. The silverleaf whitefly is responsible for transmitting the virus from one plant to another. 
If an infected plant is being fed on, this virus can be transmitted within 15-30 minutes. Whiteflies infected with the virus can hold onto it for up to a week before feeding on healthy tomatoes, allowing the infection to spread to other plants. Infectious whiteflies must re-acquire the virus after this 10- to 12-day interval by eating on an infected plant. On the contrary to other tomato diseases, which can be spread mechanically through activities like tying plants or sucking out suckers, the tomato virus TYLCV does not survive in soil or on tomato stakes, wire or string and cannot be transferred mechanically through activities like tying plants or sucking out suckers. Transmission TYLCV is spread by the Bemisia tabaci insect vector in a non-propagative, persistent-circulating way. Virus transmission is most effective when it is in the mature stage. The incubation time for this virus is about 15–20 minutes, and it can remain latent for anywhere between 8 and 24 hours.
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