high severity

Tomato Fusarium WiltIdentification & Treatment Guide 2026

Q: How long does Fusarium survive in the soil?

Fusarium oxysporum produces chlamydospores (thick-walled survival structures) that can persist in soil for 20+ years. This makes crop rotation alone insufficient — even after many years without a tomato crop, the pathogen remains viable. Resistant varieties are essential for infested fields.

Q: What is the one-sided wilting symptom?

Fusarium wilt characteristically causes yellowing and wilting on one side of a leaf, one side of a plant, or one branch before the other. This happens because the fungus initially colonizes xylem vessels on one side of the stem, blocking water to that side. This asymmetric (unilateral) symptom helps distinguish Fusarium wilt from bacterial wilt, which typically wilts the entire plant evenly.

Q: Can I grow tomatoes in Fusarium-infested soil?

Yes, if you use resistant varieties or graft susceptible varieties onto resistant rootstock. Resistant varieties carrying the I, I-2, and I-3 genes can grow productively in infested soil. Raising soil pH to 6.5-7.0 also significantly reduces disease severity.

Fusarium oxysporum f. sp. lycopersici · Family: Nectriaceae

Tomato Fusarium wilt (Fusarium oxysporum f. sp. lycopersici) causes yellowing starting on one side of the plant, wilting, and brown vascular discoloration in stems. The fungus persists in soil for decades. Manage with resistant varieties carrying I, I-2, I-3 genes, grafting onto resistant rootstock, crop rotation, and raising soil pH to 6.5-7.0.

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Quick Diagnosis

high

Tomato Fusarium Wilt

Affects: rootsstemsleaves
Peak Season: Warm weather with soil temperatures above 24°C; most severe at 27-28°C
Spread Risk: Slow
Spread By: Infested soil, contaminated tools and equipment, infected transplants, contaminated irrigation water

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Symptoms: What does Tomato Fusarium Wilt look like?

Visual identification guide — tap each stage for details

One-sided yellowing of tomato plant from early Fusarium wilt — Characteristic one-sided (unilateral) yellowing

Brown vascular discoloration in longitudinal section of tomato stem — Dark brown vascular discoloration visible in cut stem

Completely wilted tomato plant killed by Fusarium wilt — Complete plant wilt and death from advanced infection

Tahap Awal

Yellowing on one side of the plant
Yellow leaves appear on one side of the plant or on lower leaves on one branch. This unilateral (one-sided) symptom is highly characteristic.

Tahap Menengah

Progressive wilting and brown vascular tissue
Wilting progresses upward. Cutting the stem lengthwise reveals dark brown discoloration of the vascular (xylem) tissue — a key diagnostic feature. Plants may recover at night initially.

Tahap Lanjut

Complete wilt and plant death
Entire plant wilts permanently and dies. Roots show brown discoloration. In warm conditions, death can occur within 2-3 weeks of first symptoms appearing.

Causes: Why is my plant getting Tomato Fusarium Wilt?

Environmental triggers and disease cycle

Warm soil temperatures (>24°C, optimal 27-28°C)
Acidic soil (pH < 6.0)
Sandy, well-drained soils that warm quickly
Nematode damage to roots providing entry points
Previous history of Fusarium wilt in the field

Disease Lifecycle

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Host Plant

Susceptible crop

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Pathogen

Fusarium

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Conditions

Warm weather with soil temperatures above 24°C; most severe at 27-28°C

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Infection

Penetrates tissue

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Symptoms

Visible signs

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Spread

Infested soil

Often confused with: Tomato Early Blight, Tomato Late Blight, Tomato Bacterial Wilt, Panama Disease (Fusarium Wilt of Banana). See our comparison guide.

How to Treat Tomato Fusarium Wilt

Tick each step as you complete it — works offline too

🌿 OrganicSafe for all farms

Organic Treatment Steps

4 steps

Remove and destroy infected plants immediately — do not compost them.
Apply lime to raise soil pH to 6.5-7.0 (Fusarium is suppressed at higher pH).
Apply Trichoderma harzianum biocontrol agent to soil at planting time (5 g/L water as drench around roots).
Graft susceptible heirloom varieties onto Fusarium-resistant rootstock (e.g., Maxifort, Beaufort).

🧪 ChemicalUse protective equipment

Chemical Treatment Steps

4 steps

No fungicide effectively controls Fusarium wilt once plants are infected — prevention is the only approach.
Soil fumigation with chloropicrin or metam sodium before planting can reduce Fusarium inoculum in heavily infested soils.
Drench soil around healthy transplants with thiophanate-methyl (Topsin M) at 1 g/L as a partial preventive measure.
Apply carbendazim soil drench (1 g/L) at planting for partial suppression in high-risk fields.

Prevention & Seasonal Calendar

Year-round protection plan for your crops

Pre-Planting

Plant resistant varieties with I (Race 1), I-2 (Race 2), or I-3 (Race 3) resistance genes
Maintain soil pH at 6.5-7.0 through liming
Practice crop rotation of 5+ years away from solanaceous crops

Mid-Season

Use grafting onto resistant rootstock for heirloom or susceptible varieties
Control root-knot nematodes that provide entry wounds for Fusarium
Sanitize tools and equipment between fields

Post-Harvest

Use raised beds in heavy soils to improve drainage and reduce soil saturation

🛡️ Resistant Varieties

Celebrity (I, I-2)Better Boy (I, I-2)BHN 589 (I, I-2, I-3)Charger (I, I-2, I-3)

🌼 Companion Planting

These plants can reduce Tomato Fusarium Wilt pressure when grown nearby:

marigoldbasil

View full seasonal calendar for your region →

Frequently Asked Questions

Common questions about Tomato Fusarium Wilt

How long does Fusarium survive in the soil?

Fusarium oxysporum produces chlamydospores (thick-walled survival structures) that can persist in soil for 20+ years. This makes crop rotation alone insufficient — even after many years without a tomato crop, the pathogen remains viable. Resistant varieties are essential for infested fields.

What is the one-sided wilting symptom?

Fusarium wilt characteristically causes yellowing and wilting on one side of a leaf, one side of a plant, or one branch before the other. This happens because the fungus initially colonizes xylem vessels on one side of the stem, blocking water to that side. This asymmetric (unilateral) symptom helps distinguish Fusarium wilt from bacterial wilt, which typically wilts the entire plant evenly.

Can I grow tomatoes in Fusarium-infested soil?

Yes, if you use resistant varieties or graft susceptible varieties onto resistant rootstock. Resistant varieties carrying the I, I-2, and I-3 genes can grow productively in infested soil. Raising soil pH to 6.5-7.0 also significantly reduces disease severity.

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Related Disease

Tomato Early Blight

Alternaria solani

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Related Disease

Tomato Late Blight

Phytophthora infestans

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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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