Panama wilt (banana)
Old leaves yellow from the margin inward and collapse, the pseudostem base splits, and the inner tissue browns — a long-lived soil Fusarium.
- Pathogen
- Fungus (Fusarium oxysporum f.sp. cubense)
- Spreads by
- Infected suckers; soil, water & tools
- Favoured by
- Infested soil; susceptible varieties
- Main risk
- Vascular blockage; plant wilts and dies
Overview
Panama wilt (Fusarium wilt) of banana is caused by the soil-borne fungus Fusarium oxysporum f. sp. cubense (Foc). It enters through the roots and colonises the water-conducting (vascular) tissue, blocking it. The first visible sign is a yellowing of the older, lower leaves that spreads from the leaf margin inward; the leaves then collapse and hang down around the pseudostem like a skirt, while the youngest leaves may stay green for a while.
A characteristic sign is a lengthwise splitting of the pseudostem base, and — when the pseudostem or rhizome is cut across — reddish-brown to dark streaks and discoloration of the internal vascular tissue. The fungus survives in the soil for many years as resting spores (chlamydospores) and is spread by infected suckers, soil, water and tools. There is no effective cure or spray once a plant is infected; management rests on planting clean, disease-free (tissue-culture) suckers, resistant varieties, good soil health/drainage, and not moving infested soil or suckers into clean fields.
How to identify it
- Yellowing of the older, lower leaves spreading from the margin inward, then collapsing to hang around the pseudostem like a skirt.
- Lengthwise splitting of the pseudostem base.
- Reddish-brown to dark streaks in the internal vascular tissue when the pseudostem or rhizome is cut across.
- Plants wilting and dying, often in patches that expand over seasons as the soil inoculum builds.
What causes it and when
- The soil-borne fungus Fusarium oxysporum f. sp. cubense, which enters the roots and blocks the vascular tissue.
- Survives in the soil for many years as chlamydospores, so an infested field stays infested.
- Spread by infected suckers, and by soil, water, tools and machinery carrying the fungus.
- Worse on susceptible varieties and in fields already carrying the fungus.
Cultural & organic control
- Plant only disease-free, certified tissue-culture plants or clean suckers from a healthy source — never suckers from a wilt-affected field.
- Grow resistant/tolerant varieties where available — the most reliable defence against a soil-borne wilt.
- Maintain good drainage and soil health, and add organic matter and bio-agents (e.g. Trichoderma) to suppress the fungus.
- Rogue out and destroy affected plants with the rhizome, and avoid moving infested soil, suckers or water into clean fields.
Chemical control
- There is no effective spray to cure a Panama-wilt-infected plant — control is preventive and variety/soil-based.
- Where recommended, sucker/soil treatment with a fungicide or bio-agent can reduce establishment, but cannot rescue an infected plant.
- Focus on clean planting material, resistant varieties and soil health rather than chemicals.
- Confirm any recommended sucker/soil treatment and variety choice for your area with your local KVK.
Prevent it coming back
- Base new plantings on resistant varieties and clean tissue-culture plants, especially in infested areas.
- Keep the soil healthy and well-drained, build up bio-agents, and rogue affected plants with their rhizomes.
- Strictly avoid carrying infested soil, suckers, water or tools from affected fields into clean ones.
Crops most at risk
Where this problem is called out in our crop guides — open a crop for the full package of practices.
Frequently asked questions
My banana’s older leaves are yellowing from the edge and the pseudostem base is splitting. What is it?
Margin-inward yellowing of the older leaves that then collapse around the pseudostem, a split pseudostem base, and reddish-brown streaks in the inner tissue when you cut across it, are Panama wilt (Fusarium wilt) of banana. The fungus lives in the soil for years and cannot be cured, so rogue and destroy affected plants with the rhizome, and replant with resistant varieties and clean tissue-culture plants on healthy, well-drained soil.
How is Panama wilt different from bunchy top in banana?
They look quite different. Panama wilt is a soil fungus that yellows the OLDER lower leaves from the margin inward, splits the pseudostem base and browns the internal vascular tissue, and the plant wilts and dies. Bunchy top is an aphid-spread virus that bunches the NEW upper leaves into a stunted rosette with dark green dot-and-dash vein streaks. Panama wilt is managed with resistant varieties, clean suckers and soil health; bunchy top by roguing, virus-free suckers and aphid control.
Why can’t I just spray a fungicide to control Panama wilt?
Because the fungus lives inside the plant’s vascular tissue and survives for years in the soil as resting spores, so a foliar spray cannot reach or cure it, and it will re-infect from the soil. That is why control is preventive: plant resistant varieties and clean tissue-culture material, keep the soil healthy and well-drained with bio-agents, rogue affected plants with their rhizomes, and never carry infested soil or suckers into clean fields.
Symptoms and control measures follow ICAR, KVK and state agricultural-university package-of-practices; any named chemical is a registered use. Always read the product label and confirm the dose for your crop and zone. editorial policy.