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09 September 2025 | Story Martinette Brits | Photo Stephen Collett
Prof Botma Visser
Prof Botma Visser delivered his inaugural lecture at the University of the Free State, highlighting nearly two decades of research on wheat rust and global food security.

Safeguarding one of the world’s most vital staple foods was at the heart of the inaugural lecture delivered by Prof Botma Visser, Professor in the Department of Plant Sciences at the University of the Free State (UFS), on Wednesday 3 September 2025. Prof Visser shared insights from nearly two decades of research into wheat rust – a devastating crop disease that threatens both South Africa’s harvests and global food security.

“Wheat production in South Africa is threatened by three fungal pathogens that cause rust disease on the crop. Understanding the factors that contribute to virulence on locally grown cultivars is crucial to ensure continued wheat production,” said Prof Visser.

 

The fight against evolving wheat rusts

For the past 17 years, Prof Visser’s research has focused on the genetic structure of rust populations and the risks they pose to food security. His work has shown that these populations are dynamic and constantly changing due to genetic mutations within existing races, as well as the introduction of new races into South Africa.

“Computer modelling showed that rust can spread over vast distances by prevailing winds. During the 20th Century, at least four Southern African stem rust races managed to move across the Indian Ocean from Southern Africa to Australia. South Africa, in turn, received multiple new races from mid-Africa across Zambia and Zimbabwe, without any means of stopping these introductions,” he explained.

To respond to this challenge, his team recently implemented MARPLE (Mobile And Real-time Plant disEase) diagnostics using fourth-generation nanopore sequencing technology. This approach allows the rapid characterisation of fungal isolates, specifically targeting genes linked to fungicide resistance and virulence.

“This work,” Prof Visser noted, “is part of an effort to safeguard global wheat production.”

His research is a collaborative effort with Prof Willem Boshoff (Department of Plant Sciences, UFS) and Dr Tarekegn Terefe (Agricultural Research Council – Small Grain, Bethlehem). Together, their work has positioned the UFS as an internationally recognised centre of excellence in wheat rust research.

 

About Prof Botma Visser

Prof Botma Visser obtained his BSc in Botany and Microbiology (1988), BSc Honours in Microbiology (1989), and MSc in Botany (1993) at the University of the Free State, where he also completed his PhD in Botany in 2004.

His career spans more than 18 years of research into wheat rust pathogens, combining annual surveys, race pathotyping, molecular genetics, and cutting-edge sequencing technologies. His expertise has not only advanced understanding of rust population dynamics in South Africa but also contributed to global collaborative studies on crop disease.

News Archive

Two degrees in three years for former teacher
2013-12-17

Jacqui Middleton

When Jacqui Middleton entered university in 2011, she did so alongside her daughter, both women enrolling for their first-year studies at the University of the Free State. Three years later and the mother of three have completed two degrees – a double feat achieved with distinction.

Middleton, a former teacher, will receive a BA degree in Corporate and Marketing Communications at the April 2014 graduation ceremony and a master’s degree in Sustainable Agriculture at the June graduation ceremony. With these two qualifications in the bag, Middleton will pursue her studies with a BCom Honours degree next year, as well as a PhD degree in Sustainable Agriculture.

“It was my first full-time studies since 1988,” says Middleton. “I was a teacher for 22 years and my husband kept saying that I needed to get out of the classroom and into the corporate world. I was reluctant because I was so passionate about education and my children were still at school.”

Things changed when Prof Jonathan Jansen, Vice-Chancellor and Rector of the UFS, visited the Ikanyegeng Primary and High School in Jacobsdal – where she was a teacher – to deliver a motivational talk. Middleton approached Prof Jansen about a bursary. The next year, with the support of her family, she moved to Bloemfontein and stayed on campus studying for two degrees.

“For me it was a major step of faith because we were relying on my salary and I had to give that up to study, so we had to believe there is something bigger beyond the three-year period.”

Something bigger definitely awaited. Her study record of the last three years reflects a dedicated student who passed most of her subjects with marks higher than 80%. 

With her new qualification, Middleton will follow a career in agriculture and farming with her husband. ”I am still passionate about education, but now I am passionate about educating farmers to assist with the land reform process. Land reform is crucial for food security in our country and at the moment we need more success stories of black farmers moving from emerging to commercial farming. I believe that whatever you studied in life should not be wasted.”

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