Tomato leaves turning yellow: Causes and cure of the problem


Have you noticed tomato leaves turning yellow? If you have a tomato plant at home, you need to ensure that you take care of them properly. 


There are many reasons why your precious tomato plant leaves are turning yellow. Often yellow leaves on the bottom of tomato plants may not be a cause of worry as they’re natural. Nonetheless, in many cases, you may find these turning yellow, which can turn out to be a cause of concern. 


The tomato leaves turning yellow can often sign something more simple like lack of water or pest attack. It can be extremely hard for beginners. Well, as stated, there may be various reasons. As gardeners, you need to identify the cause, check with the markers, and ensure preventive measures. 


What are the causes of tomato leaves turning yellow? 

The yellow leaves on the bottom of tomato plants shouldn’t raise brows, but you need to be careful. Make sure to check the markers so that you can avoid potential damages to your tomato plants. 


Some of the common reasons for tomato plant leaves turning yellow and curling include the following.


Transplant shock

When you transplant the tomatoes early in spring, you can expect tomatoes to go yellow. This is mainly because of the adjustment period that they will face. However, in the coming weeks, you will notice the lightning of the leaves. However, the lightning will be visible only on the lower parts of the plant, while the upper part will be healthy. 


As soon as you notice these tomato leaves turning yellow, make sure to chop them off. These ensure protection while maintaining the healthy part of the plants. Before transplanting your tomato plants, make sure to wait for the right season to arrive. Moreover, chopping off yellow tomato leaves can help to prevent the risk of diseases as well. 


Overwatering and Fusarium root rot

For the tomato plants to grow correctly, it is essential to provide the best moisture levels. As per the experts, the soil should neither be too wet nor too dried. However, you should also avoid overwatering the plants. Depending on the soil type, weather condition, and other factors, you will need to determine how much moisture the plants can take. 


In many places, you need to water several times a day to provide sufficient water levels. However, in many places watering once or twice a week is enough. 


Root rot is another common phenomenon for tomato leaves turning yellow. If you notice tomato plant leaves turning yellow and curling, you will need to determine the exact impact. Furthermore, it is advisable to check potential side-effects. When the roots of plants are flooded with water for a long time, they will not breathe. As a result, the plant roots will eventually decay. This decay may spread to other parts of the root, eventually resulting in the plant’s death. 


Root rot is common in many plants. Well, it is necessary to focus on various aspects to save these. If you notice the problem in stems (turning brown), you need to remove the wrinkles before it damages the entire plant. 


Non-aerated soil

Non-aerated soil can harm the soil. It is advisable to be careful with the seeds. If you do not water the plants properly, they will eventually grow, and weeds will negatively impact them. Compact soil or non-aerated soil is never a good choice for growing tomatoes. 


The compact soil prevents root propagation. As a result, limiting the number of nutrients the plant gets. As a result, the leaves will turn yellow, which is a clear symptom of nutrient deficiency. If you have planted tomato plants in compact soil, you need to be careful with the roots. Make sure that you do not damage the roots. You will eventually notice recovery, which can be extremely helpful in the long run. 


Septoria Leaf Spot

The septoria leaf spot is a result of a fungus attack, Septoria lycopersici. Almost every tomato plant gets damaged due to the septoria leaf spot. This is a common problem that happens mostly during humid or freezing weather. However, the good part about septoria leaf spots is that you can easily distinguish them from the yellowing leaves. 


The fungus is not based on soil, which is why it can easily survive during the winters. If you notice the fungus outbreak, make sure to take every preventive measure for treating your plants. Warm temperatures and high humidity are beneficial for the growth of fungus, which will soon damage your plants. 


Please detect the yellowing of the leaves early only. However, it is advisable to get rid of the yellow leaves as early as possible, or they might damage the entire plant. When you water the plants, you should water on the ground to ensure better growth. 


Fusarium wilt

Fusarium wilt is one of the most common problems plants face. This is caused due to the soil-borne pathogen Fusarium oxysporum. The fungus will infect the entire plant, especially the roots. This will further prevent plants from absorbing water. It can cause wilting, but death is infrequent. 


The yellow tomato leaves are hazardous. The gardeners will always look for ways to revive the plant. It is advisable to know the leading cause of the problem. Knowing the exact cause will play an essential role in determining the exact cause behind fusarium wilt. 


You should maintain the pH of the soil for growing the tomato leaves. The ideal pH level for maintaining plant growth is 6.5. If you notice the problem happening repeatedly, make sure to check the variety of the plant. If the plant has been attacked by fungus, you will need to be extremely careful with it. The best way to protect the plants is to uproot and burn them. However, please do not dispose of them in a compost pit. 



As soon as you notice tomato leaves turning yellow, make sure to remove the part. One leaf will grow to damage the entire plant. Hence, it is advisable to consider all aspects properly before choosing the plants and maintaining them. 


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