Saving the banana from Tropical Race 4


October 19, 2021

ARTICLE

A coalition of researchers and scientists at Bayer Crop Science are working together to protect the world’s most popular banana variety from the Tropical Race 4 fungal pathogen.

TR4, also named Panama Disease, is a new fungal pathogen threatening the future of the Cavendish banana, which accounts for 95% of banana production. Over 400 million people around the world rely on these bananas for 15 to 27 percent of the calories in their diets.

Botanically, TR4 first affects the root system of banana plants by entering through wounds and stopping the flow of nutrients and water in the vascular bundles. After infection, the leaves will start to wilt and turn black, no fruit will be produced, and a farmer will be left with an infected field.

At this moment, there is no known commercially available treatment for TR4, and the only effective method to manage and prevent the spread of this pathogen is to burn the infected land. Even after a mass burning, TR4 can remain in the soil for years.

TR4 was first found in Southeast Asia and has since been found in Australia, East Asia, Africa, and recently in South America. Rapid transmission of this fungal pathogen is made possible through soil and water movement. Poor attention to hygiene between infected and uninfected fields can lead to TR4 being dispersed on clothing, the soles of workers’ shoes, and machinery. To make matters worse, farmers might not know that they have TR4-infected fields until months after exposure. The incubation period for TR4 can last several months before symptoms show up.

To combat this detrimental disease, Bayer has teamed up with scientists and researchers from around the world to find solutions to TR4. The Global Alliance for Cooperation to Fight Against Fusarium TR4 was created in January 2020 to defeat TR4 by educating consumers and producers, developing genetic tools, and preventing the spread of the pathogen.

Bayer is working to inform local governments and farmers about how to prevent spreading the disease. Producers can now access a five-module online course through the IICA training platform to learn about TR4. The course describes the effects of TR4, how the disease spreads, and management techniques. In addition, scientists are developing cultivars and methods to strengthen the root system against fungal entry.

There is hope for banana. In Australia, researchers have inserted a wild banana gene into the common Cavendish banana. After a three-year exposure period, the new banana variety was found to be 100 percent resistant to TR4.

By bringing the brightest minds together to fight TR4, Bayer and the scientific community have been better able to address the complex and challenging issues facing the banana industry. Agricultural technology and genetic plant breeding might just be the keys to saving the banana.

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