Panama disease tropical race 4 (TR4) has officially been identified on an 11th banana farm in Queensland, intensifying concerns over the disease’s impact on the global production of Cavendish bananas.
This soil-borne fungus specifically targets Cavendish varieties, which make up over 97% of banana production in Australia and a significant portion worldwide. In response, researchers and plant breeders are leveraging both traditional methods and innovative technologies to cultivate banana varieties that can resist TR4.
Leon Collins, a banana grower based south of Cairns, has found himself at the forefront of this ongoing battle against the disease. “Some days it feels like we are losing ground. It’s incredibly challenging,” the Tully farmer remarked. “It’s disheartening, yet it’s a reality we must face.”
For more than ten years, farmers along the Tully River have been coping with the relentless spread of TR4, which, despite extensive efforts, has gradually moved down the river. The fungus is particularly concerning as it is persistent in the soil, surviving for decades and attacking banana plants through their roots, ultimately leading to their demise.
As the chair of the Australian Banana Growers’ Council, Mr. Collins has been actively leading initiatives to combat TR4. However, the recent detection on his farm means he is now personally affected by the situation. “Life sometimes deals you difficult cards,” he stated, expressing hope that the rest of the industry might avoid the same fate.
“I believe that advancements in plant breeding will be our salvation,” he added. Researchers, scientists, and plant breeders are making strides toward creating a new variety of Cavendish banana that can resist this devastating disease.
In a significant development, researchers at the Queensland University of Technology (QUT) recently obtained federal approval to commercialize the world’s first genetically modified banana, specifically designed to withstand TR4. This new variety, known as QCAV-4, maintains the appearance and flavor of traditional Cavendish bananas, with the only distinction being the incorporation of a resistant gene.
Although the fruit was trialed in the Northern Territory, where TR4 has been present since the 1990s, it is not yet available for commercial cultivation. Anthony James from QUT’s Centre for Agriculture and the Bioeconomy noted that there is growing interest among growers in the Tully Valley for more extensive trials of these modified bananas to assess their viability against existing varieties.
While QCAV-4 is not yet on the market, public perception of genetically modified foods remains cautious. According to a 2024 report from the Office of Gene Technology Regulator, only 32% of respondents expressed a willingness to consume GM fruits and vegetables. However, Dr. James emphasized that QCAV-4 has undergone thorough scientific and regulatory scrutiny, assuring potential consumers of its safety.
Additionally, other initiatives, such as one led by Naomi Abbott from North Queensland Banana Research, are exploring traditional breeding techniques. “We have initiated plant breeders’ rights for several of our key lines, and we anticipate having our first Cavendish line ready by 2028,” she stated. Abbott explained that they are collaborating with FIA, a banana breeding program in Honduras, to develop TR4-resistant varieties.
“Currently, we have about 30 to 40 hybrids under development, with four being prioritized,” she noted. “Among these, we are focusing on two Cavendish varieties, with one standing out as a leading candidate.”
The Queensland Department of Primary Industries is also working on introducing TR4-resistant Cavendish varieties, supported by international collaboration. Principal Horticulturalist Jeff Daniels reported that seven Cavendish lines have demonstrated enough resistance, but they do not produce sufficient yields for the Australian market, with yields ranging between 60% to 90% of industry standards.
“We still have a long way to go, and further investment is necessary to develop a better TR4-resistant Cavendish variety than what is currently available,” Daniels added.
Thus far, the stringent biosecurity measures implemented by banana growers in the Tully region seem to have contained TR4 to that area. “We have adopted a comprehensive approach, but it is still a challenge to slow down the spread,” Mr. Collins remarked. “Innisfail, located 50 kilometers north, is our largest growing region now, so we must safeguard it from the disease.”
Nearby banana farmer Adrian Crema, who has yet to encounter TR4 on his farm, remains vigilant about the looming threat. He expressed optimism regarding the potential for resistant varieties. “I was thrilled to learn that research is progressing and that new varieties may soon be available,” he said. “That was the most promising news I’ve heard this year.”
