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"My tomato leaves are curling" is the most asked question we get from Indian growers. The frustrating part: the curl can mean four completely different things, and three of them have completely different fixes. This guide walks through how to tell them apart from a single careful look — and gives you the fix that actually works for each one.
A note before you spray anything: send a clear daylight photo of the affected leaf through our AI plant doctor for a first read. The model is trained on Indian crop images and will narrow this down faster than reading a guide. Use this page to confirm and to learn the protocol.
Photo of the leaf in daylight, plain background, in focus. Upload it; the AI returns the most likely problem and a step-by-step fix. Free, no card needed.
Try the AI plant doctorRead each block. Match what you're seeing in your plant to one of them. If two seem to fit, start with the one that affects new growth.
Likely tomato leaf curl virus (TYLCV / ToLCV), spread by whitefly. New growth is the most affected. Leaves curl upward at the edges, get thick and leathery, often turn pale-green or yellow at the veins. Plant slows down, sets fewer fruit.
There is no chemical cure for the virus itself — once the plant is infected, the virus stays. The fix is to (a) stop the whitefly from spreading it to your other plants, (b) keep the infected plant alive and productive long enough to harvest what's already on it, and (c) plant a TYLCV-tolerant variety next season. Step-by-step protocol below.
Likely early blight (Alternaria solani). A fungal disease, not viral. Lower leaves first, working upward. The brown ring in concentric circles inside the yellow patch is the giveaway — almost no other Indian tomato disease has that exact ring pattern.
This is treatable. Pluck the affected leaves and bin them (don't compost — spores survive). Spray neem oil (5 ml in 1L water + a drop of soap) every 7 days. For severe cases on high-value plants, copper-based fungicide following the label dosage. Mulch to stop spores splashing up from the soil.
Often heat or wind stress, not disease. Common in April–May before the rains. Leaves curl down to reduce surface area for transpiration. The plant is otherwise healthy — fruit set is unaffected and growth continues.
Move the plant out of direct afternoon sun for the rest of the dry season. Mulch heavily. Water deeper but less often (so roots grow deeper, not surface-y). Once monsoon arrives the curling usually self-corrects within 5–7 days.
Aphids on the underside of leaves. They cause distorted new growth that LOOKS like leaf curl but is actually mechanical damage from the aphids feeding. You'll see the insects with the naked eye if you flip the leaf.
A strong spray of plain water knocks most off — repeat for 3 days. Then 2 ml dish soap in 1L water as a follow-up spray every 5 days for two weeks. Encourage ladybirds (don't kill them — they eat aphids). Bad infestations: neem oil at 5 ml in 1L water.
If you've confirmed it's the virus (curled leathery NEW leaves, yellowing veins, slowed growth), here's the protocol Indian growers we work with use. It will not cure the plant. It will stop the whitefly from infecting your other plants and let the sick plant carry its existing fruit to harvest.
If three or more of your tomato plants show the same curling — that's not coincidence and a 5-minute video call is faster than another guide. Also call when the AI plant doctor returns "uncertain" on the same leaf twice.
Start a free 5-minute callThere is no guaranteed cure for tomato leaf curl virus. Anyone selling you a chemical that "cures TYLCV" is selling you a general insecticide and hoping it kills enough whiteflies to stop further spread. The protocol above is the same one IIHR and ICAR extension agents recommend; it limits damage and protects your other plants. Any treatment plan generated by our AI tool or in this guide is indicative — for high-value crops or recurring problems, get a real agronomist on the line.
References: ICAR–IIHR variety recommendations; CABI Plantwise knowledge base on Tomato Leaf Curl Virus; field experience from Lucknow, Noida, and the Indo-Gangetic plain. Updated 8 May 2026.