Fusarium wilt Tropical Race 4 spreads through South America's banana export zones as Colombia, Peru, and Venezuela confirm the pathogen threatening 80% of global banana trade

Summary

Fusarium oxysporum f. sp. cubense Tropical Race 4 (Foc TR4), the soil-borne fungal pathogen responsible for Panama disease, was confirmed in Colombia in 2019, the first Latin American detection, and subsequently in Peru by 2022. These detections place Foc TR4 within striking distance of Ecuador, the world's largest banana exporter, and the wider South American banana belt that supplies the majority of the world's Cavendish bananas. Foc TR4 has now been confirmed in 24 countries across Southeast Asia, South Asia, the Middle East, Africa, and Latin America. The pathogen destroys banana plants by colonising the vascular system, cannot be removed from contaminated soil with any commercially viable treatment, and makes permanent the conversion of affected fields. No commercially available Cavendish replacement is ready for deployment at scale, making phytosanitary containment the only available management strategy.

The split

Latin American banana exporters, led by Ecuador and Colombia, framed the Foc TR4 incursion as requiring international biosecurity cooperation and funding equivalent to the agricultural emergency it represents, and called on FAO's International Alliance Against Panama Disease to accelerate both containment protocols and alternative variety development. Consumer market buyers, led by major supermarket chains and trading companies in Europe and North America, have been largely absent from public commitments on funding the necessary breeding and biosecurity response. Researchers at CGIAR and Wageningen University argued that neither conventional breeding nor genetic engineering of the Cavendish is close enough to commercial readiness to prevent a collapse scenario if Foc TR4 reaches Ecuador's Cavendish plantations, and that the history of the 1950s Gros Michel replacement (which took more than a decade and resulted in significant market disruption) was a realistic benchmark for what a Cavendish replacement would entail.

By the numbers

• 24: countries with confirmed Foc TR4 as of 2025
• 2019: year of first Latin American Foc TR4 confirmation (Colombia)
• 2022: year of Peru confirmation
• $25 billion: estimated annual global banana trade threatened by Foc TR4 (FAO estimate)
• $3-4 billion: estimated annual losses to Ecuador alone if Foc TR4 reaches its main production zones (FAO model)
• 47%: share of global banana export trade supplied by Latin America
• 1950s: last major Panama disease event (Race 1 against Gros Michel), which eliminated the previous commercial variety

Why it matters

The Panama Disease threat to the Cavendish banana is a slow-moving but potentially irreversible supply chain crisis. The Cavendish replaced the Gros Michel after Race 1 Panama disease eliminated it from commercial production in the 1950s, but that replacement took more than a decade and required replanting the global banana plantation base with a new variety. A repeat scenario with Foc TR4 and the Cavendish, which is genetically more uniform than the Gros Michel was, could be faster-moving and harder to manage because: soil contamination is permanent, the genetic uniformity of Cavendish plantations means the pathogen spreads efficiently, and no commercially ready replacement exists. For the approximately 400 million people in the developing world who rely on banana and plantain as a staple food (as distinct from the export Cavendish trade), the loss of Foc TR4-susceptible local varieties to this pathogen could have food security consequences.

What to watch

• Whether Foc TR4 is confirmed in Ecuador, and if so how quickly it spreads through Ecuador's main Cavendish production regions
• CGIAR and Bioversity International's timeline for commercial-scale deployment of any TR4-resistant variety
• Whether major supermarket buyers and trading companies fund the biosecurity and breeding response at meaningful scale
• FAO's 2026 update to its Foc TR4 global status assessment