Banana killing fungal disease TR4: the day after tomorrow

With Latin America frenetic over the arrival of the banana killing fungal disease TR4, FruiTrop explains how we can finally see a sign, or even an opportunity, to put an end to six decades of ultra-intensive cropping based on a single variety.

An article on asks the question: What if the arrival of TR4 fusarium wilt in Colombia was a blessing? The banana world as a whole might choke on those words. The trauma of the announcement of its discovery in north-east Colombia is so acute, throughout the export banana world, that the slightest word of provocation can lead directly to the gallows.

The outbreak of an incurable disease, the symptoms of which only appear once it is already well established, and the effects of which are lethal in the short term, regardless of the production contexts, has led to the entire banana planted area, i.e. some 500 000 hectares, facing the threat of disappearance. And this threat is being taken remarkably seriously by growers. All the better, if this leads to introspection. All the better, if in the end we can envisage a future for the banana world different from how it is at present. Long live TR4! If it helps us finally get past this blinkered way of thinking, which can be summed up in a single word: Cavendish.

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Combating commoditisation
The world market (approximately 20 million tonnes) is organised, formatted, consolidated, capitalised, and ultimately, stuck. The Cavendish banana and all its avatar clones (Valery, Grande naine, Petite naine, Williams, etc.) are a perfect match for the needs of what is known as a commoditised market. Commoditisation refers to the process by which a product becomes so commonplace that it practically ends up being a commodity. High volumes and low prices are what characterise this type of market. The banana is listed just like the barrel of oil or the dollar. It is a single product, and therefore commercially fluid. The banana can go from hand to hand, crossing seas and borders; and its pedigree remains the same worldwide. True, the industry is not completely free from segmentation, yet this is only a fairly recent phenomenon, involving only production modes (organic), social and/ or environmental labelling (Fairtrade, Rain Forest Alliance, etc.), sizes (fingers or bunches), stages of maturity or finally brand marketing. Also, Cavendish is always synonymous with high yields and profitability for the most efficient growers. You know what you are getting: a marketable yield of 50, 60 tonnes per hectare, and sometimes even much higher. Yet it is hard to imagine what you are going to encounter commercially speaking. No other commercial variety of the genus Musa offers this level of productivity.

And what volumes there are of small banana varieties (freycinette) or red banana varieties do nothing to invalidate this observation. It is a unique example in the world of the main fresh fruits and vegetables. Even the kiwi or pineapple have been based for years now on a wider varietal range. Furthermore, varietal commoditisation is a very long-stand- ing phenomenon, and indeed representative of this world market. Exports began in the early 19th Century from Cuba to New Orleans with the Gros Michel variety (Gros Michel sub- group, very similar to the Cavendish sub-group). It was not until the 1950s that a multinational (Standard Fruit Company) launched the first Giant Cavendish trials (see FruiTrop Focus Banana, January 2017, page 188), already under pressure from fusarium wilt race 1. The world market underwent a swift and radical overhaul, going from Gros Michel to Cavendish in record time. Six decades later, the principles of intensive monoculture based on Cavendish are the absolute rule on which the international market is based. Except that, as in the case of Gros Michel, Cavendish is ultra-sensitive to fusarium wilt race 4. So yes, the arrival of TR4 in Colombia does open up some opportunities, for at least three reasons.

TR4: a unique opportunity for a varietal change
Firstly, varietal change is the one and only way to effectively combat the damage caused by the fungus. The use in the Philippines of mutant Cavendish (a GCTCV-218 or Formosana clone), or the hopes placed in the selection of tolerant clones (e.g. the Ruby variety, a selection of Grande naine) by the VITROPIC vitroculture laboratory, are among the current R&D avenues. Varietal enhancement by conventional cross-breeding or by using NBTs is opening up prospects, but in the medium or even long term. The diversity of the genus Musa is also immense, as is shown in summary form by the descriptive table.

The Holy Grail for the research world is a “Cavendish like”, with a view to the needs of the market. Yet we should not forget to delve into the huge worldwide genetic heritage of the banana. In any event, we need to shift the paradigm of an industry built on a single standard. Cropping systems, packaging techniques, logistics, the ripening process, etc., are standardised for Cavendish alone. Daring to change variety would call into question decades of knowledge and habits. The market abhors technological breakthroughs, unless forced on by regulations, technical immobilisation, diseases or demand. The expansion of the TR4 disease provides grounds to believe that diversification is the necessary way forward.

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