Leaves Curl Up on Tomato Plant – 5 Reasons

If the leaves of your tomato plants bend or curl, the problem may be due to biological, chemical, or physical factors. Sometimes all the leaves curl, sometimes only the young leaves curl. In today’s article, we are going to look at the 5 reasons why leaves curl up on tomato plant.

Leaves Curl Up on Tomato Plant Due to Environmental Damage

This is one of the main causes of leaves curl up on tomato plant and also one of the most common and easy to treat.

Strong wind and low humidity can damage the leaves of tomato plants. Heat causes them to dry out and subsequently fold and curl.

Hot and dry weather can cause physiological curling which is the plant’s self-defense to prevent further water loss. This physiopathology does not decrease crop yields if it is isolated unless it is severe, in which case it would affect production. Plant health will improve when climatic conditions improve.

Herbicide Drift Damage

Many of you do not apply herbicides to your crops because this is a website where everything we use is organic, but herbicide drift can occur. And what is drift? Well, a neighbor or crops next to yours use chemicals to treat weeds or pests and the wind moves them to your garden damaging the tomato and causing leaves curl up on tomato plant.

A light wind of 3 mph (5 km/h) can be enough to move the herbicide up to 0.6 mi (1 km) away, causing enormous potential damage.

To know if you have been affected by this, we must observe the plant if it corrects or not the rolled leaves because if they dry and die it may have been caused by the drift.

leaves curl up on tomato plant herbicide

Leaves Curl Up on Tomato Plant Due to  Herbicide Residues in Mulch and Manure

Even when buying mulch such as straw or hay, we should find out if it has been treated with herbicides during its cultivation, since they remain in the plants for up to 18 months and can cause damage to the vegetables in the garden.

The seller should inform us if the crops have been treated with aminopyralid and if he does not inform us, we should ask. Moreover, the herbicide may even remain in the compost because the animals have ingested the contaminated fertilizer.

A solution to eliminate this herbicide can be to spread the plants or the compost on the ground so that the sun shines on it and to water it so that the process is faster.

White Mites

These mites affect a lot of the Solanaceae family such as tomatoes, bell peppers, potatoes. They avoid light and feed on the flowers and leaves of plants, when they bite them, they transmit toxins that bend and curl the leaves.

These are hard to see but are on the underside of leaves and their eggs look like oval-shaped Christmas ornaments. They are treated with any ecological acaricide or sulfur.

We recommend this organic product that we already used with our plants and had excellent results (Order it here).

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white mites on tomato plants

Leaves Curl Up on Tomato Plant Due to Virus

They can be confused with those described above but the disease progresses and the symptoms gradually spread throughout the plant, yellow leaves and then dry, rolling, dwarfing, and finally death.

There are many viruses such as mosaic virus, spoon virus, yellow leaf curl virus, but they all have in common that they stop the growth of the plant.

They have no solution so the best thing to do is to carefully pull the plant and put it in a bag and dispose of it to prevent the virus from spreading to the rest of the garden.

We hope you have found our article on the leaves curl up on tomato plant useful. Learn more about yellow leaves on tomato plants.

About Henry Morgan

We are the Morgan family, Henry, and Morgan, both agronomists from the University of Michigan, where we met. We are experts in putting our hands in the soil and developing organic foods and improving production processes for decades. Likewise, we have worked for companies such as Mondelez International, BASF, Monsanto, etc. currently in our role as science writers for TheGardenStyle.com as well as advisors in promoting large scale food growing in urbanized areas. In this website, we share what we are most passionate about, gardening and farming. Enjoy and see real photos on our website.