Bananas on the Brink: Gene-Edited Supervarieties Target Panama Disease

TR4, a wilt fungus, afflicts banana plantations in 20 countries from the Philippines to Peru. It blocks nutrient uptake, kills plants, and can linger for 30 years. In Peru’s Piura region 45 % of farms are infected, halving yields; 15 000 ha are affected in the Philippines. Almost all commercial bananas (? 99 %) are the Cavendish clone, a sterile triploid propagated by suckers, making the crop vulnerable after Panama disease strain (TR1) eliminated Gros Michel variety in the 1960s.

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Tropic Biosciences uses CRISPR to deactivate Cavendish genes that permit TR4. After two years of cell culture and eight months of sprouting, it screens up to 500 000 plantlets, selecting the 1 in 200 that show resistance. Field trials in Central America and Southeast Asia, and an £80 million March funding round will create “mother plantations” for growers, commercial scale by 2028.

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Bananas feed 400 million people and generate £700 million in UK sales. UK consumers bought 70 million bananas, raising demand to 4.5 billion pieces. Global exports total $15.4 billion (£11.5 billion) annually, a multi-billion-dollar industry.

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Tropic’s director of technology and research, Dr Philip Zegerman, said resistance must be paired with fruit and noted reliance on Cavendish was a matter of luck when the previous disease struck. Professor Altus Viljoen warned risk is existential for small growers. UN Food and Agriculture Organisation called TR4 “one of the most aggressive and destructive fungi in the history of agriculture.” Critics note banana firms may reap benefits while poorer growers could struggle to afford plantlets, and groups remain wary of altered produce.

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TR4 has halved yields in Peru’s Piura region, closure of a tenth of plantations there, and infection of 15 000 ha in the Philippines; the fungus is present in Ecuador. Yet no verified trial results have been published, and release remains projected for 2028.

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• “At the end of the day, it’s not just the resistance that the growers need, it’s whether you also get the right fruit at the end and whether you can sell it.” — Dr Philip Zegerman, Director of Technology & Research, Tropic Biosciences

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• “Dr Zegerman said: “It was complete luck that we had the Cavendish waiting to take over.” — Dr Philip Zegerman

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• “For small growers who cannot move to disease-free areas, the risk is indeed existential.” — Prof Altus Viljoen, Plant Pathology, Stellenbosch University

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• “We want to replace all the bananas that are grown globally with elite, new varieties. Made in Norwich.” — Dr Philip Zegerman

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Tropic plans to commercialise the edited plantlets under royalty-based licences, with an £80 million fund supporting “mother plantations.” Talks with charitable foundations aim to extend the technology to subsistence farms. If field trials confirm durability, the TR4-resistant “super-banana” could appear in supermarkets by 2028.

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Sources differ on the future banana’s branding, citing “Made in Norfolk” versus a company quote of “Made in Norwich.” No verified trial data have been published, leaving efficacy and scalability uncertain.

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