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Tomato Yellow Leaf Curl VirusIdentification & Treatment Guide 2026

Tomato yellow leaf curl virus (TYLCV) · Family: Geminiviridae

Tomato yellow leaf curl virus (TYLCV) is a begomovirus spread by whiteflies (Bemisia tabaci). Infected plants show upward leaf curling, yellowing leaf margins, stunted growth, and flower drop. There is no cure — management relies on resistant varieties, whitefly control with neem or imidacloprid, reflective mulches, and insect-proof netting.

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Quick Diagnosis

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Tomato Yellow Leaf Curl Virus

Affects: leavesstemsflowers
Peak Season: Year-round in tropics; peaks during hot, dry seasons when whitefly populations are highest
Spread Risk: Fast
Spread By: Whitefly (Bemisia tabaci) — persistent, circulative transmission

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Symptoms: What does Tomato Yellow Leaf Curl Virus look like?

Visual identification guide — tap each stage for details

Mild upward leaf curling from early TYLCV infection in tomato — Slight upward leaf cupping in newly infected plant

Severe leaf curling and yellowing from TYLCV in tomato — Severe curling, yellowing margins, and stunted growth

Stunted tomato plant with no fruit set due to TYLCV — Severely stunted plant with flower abortion and no fruit

ระยะเริ่มต้น

Mild upward curling of young leaves
Newly emerging leaves show slight upward cupping and curling at margins. Plants may appear slightly pale compared to healthy neighbors.

ระยะกลาง

Severe curling, yellowing, and stunting
Leaves curl severely upward and inward, becoming cupped and rigid. Leaf margins turn yellow. Internodes shorten dramatically, giving a bushy, stunted appearance.

ระยะท้าย

Flower drop and no fruit set
Infected plants produce few or no flowers. Existing flowers abort. If any fruit sets, it is small and unmarketable. Growth nearly stops.

Causes: Why is my plant getting Tomato Yellow Leaf Curl Virus?

Environmental triggers and disease cycle

High whitefly (Bemisia tabaci) populations
Nearby infected weed hosts or old tomato crops
Warm dry weather favoring whitefly reproduction
Absence of resistant varieties
No physical barriers (netting, row covers)

Disease Lifecycle

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Host Plant

Susceptible crop

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Pathogen

Begomovirus

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Conditions

Year-round in tropics; peaks during hot, dry seasons when whitefly populations are highest

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Infection

Penetrates tissue

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Symptoms

Visible signs

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Spread

Whitefly (Bemisia tabaci) — persistent

Often confused with: Cotton Leaf Curl Disease, Cassava Mosaic Disease, Maize Streak Virus Disease. See our comparison guide.

How to Treat Tomato Yellow Leaf Curl Virus

Tick each step as you complete it — works offline too

🌿 OrganicSafe for all farms

Organic Treatment Steps

5 steps

Remove and destroy infected plants immediately to reduce virus source for whiteflies.
Apply neem oil (5 ml/L water) every 5-7 days to suppress whitefly populations.
Install yellow sticky traps (1 per 2 m²) to monitor and reduce adult whitefly numbers.
Release natural predators: Encarsia formosa or Eretmocerus eremicus parasitoid wasps.
Use reflective silver mulch around plant base to repel whiteflies.

🧪 ChemicalUse protective equipment

Chemical Treatment Steps

4 steps

Treat transplants with imidacloprid (Confidor) as soil drench (0.5 ml/L) at planting for systemic 3-4 week protection.
Spray pyriproxyfen (Admiral) at 1 ml/L to control immature whitefly stages.
Apply spiromesifen (Oberon) at 0.5 ml/L for both adult and nymph control.
Rotate insecticide classes to prevent resistance in whitefly populations.

Prevention & Seasonal Calendar

Year-round protection plan for your crops

Pre-Planting

Plant TYLCV-resistant varieties (Ty-1, Ty-2, Ty-3 gene carriers)
Use insect-proof netting (50-mesh) in nurseries and over young transplants
Lay reflective silver plastic mulch to repel whiteflies

Mid-Season

Maintain a crop-free period of 2-3 months between tomato plantings in the area
Remove all weeds that serve as whitefly hosts (especially Datura, Solanum spp.)
Transplant during cooler months if possible, when whitefly pressure is lower

Post-Harvest

Avoid planting downwind of older infested tomato or cotton fields

🛡️ Resistant Varieties

ShantyTygressTolstoiTylkaTY FynestGalilea

🌼 Companion Planting

These plants can reduce Tomato Yellow Leaf Curl Virus pressure when grown nearby:

marigoldbasilnasturtium

View full seasonal calendar for your region →

Frequently Asked Questions

Common questions about Tomato Yellow Leaf Curl Virus

Can TYLCV be cured once a plant is infected?

No. There is no cure for any plant virus including TYLCV. Once infected, a plant remains infected for life. The only management strategy is prevention — controlling whitefly vectors and using resistant varieties.

How do whiteflies transmit the virus?

Bemisia tabaci acquires the virus by feeding on an infected plant for as little as 15-30 minutes. The virus circulates within the whitefly's body, and after a latent period of 8-24 hours, the insect can transmit it to healthy plants for the rest of its life.

Can TYLCV spread through seed or soil?

No. TYLCV is not seed-transmitted or soil-borne. It is transmitted exclusively by the whitefly Bemisia tabaci. However, infected transplants moved from nursery to field are a major pathway for spread.

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Related Disease

Cotton Leaf Curl Disease

Cotton leaf curl virus (CLCuV complex)

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Related Disease

Cassava Mosaic Disease

African cassava mosaic virus (ACMV)

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Affected Plant

Tomato

Solanum lycopersicum

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Treatment Guide

Full Treatment Protocol

Detailed spray schedule & dosage guide

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