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Prof Botma Visser takes on rust diseases threatening South Africa’s wheat

09 September 2025 | Story Martinette Brits | Photo Stephen Collett

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

Top achievers arrive at UFS

2017-01-26

Description: Tshepo Thajane Tags: Tshepo Thajane

Tshepo Thajane, winner of the Kovsies
Star of Stars competition.
Photo: Eugene Seegers

Although first-year registration officially started on 23 January 2017 at the University of the Free State (UFS), the Marketing department invited some of the top-achieving matrics in the country to an event on Friday 20 January to assist them with early registration. These high-flying pupils have AP scores of 40 and above, and worked hard to get to where they are today, with driving ambition for their future.

The #StarOfStars
Tshepo ”Doctor” Thajane is the winner of the newly-established Kovsies Star of Stars competition, and as such received a full bursary from the UFS, among other sponsorships. He has enrolled in Actuarial Sciences and will be housed at the Karee residence. When asked what drew him to our university, he responds: “I just loved the university before I entered it, and I chose the UFS because of the respect I was shown.”

Friendly reception
Lendl Ontong will be pursuing his LLB in the Faculty of Law, and has obtained a place in the brotherhood of the Karee residence. The Ontong family hails from Worcester in the Western Cape. Lendl’s father, Mr Lionel Ontong, had this to say of his experience: “The staff at the UFS, especially at the admissions office, is the friendliest group of people I’ve ever come across, and helpful as well. My wife was sceptical when I told her about the friendly treatment I experienced when I phoned the university, but when she witnessed it today, she could see it first-hand. The friendliness is contagious, and even though I’m tired after the long journey, their attitude has rubbed off on me. And my wife now has the assurance that her child is going to be happy here. The atmosphere is one of homeliness. It’s fantastic! Even the netball coach introduced herself to my son and invited him to pop in for a cup of tea, and she won’t even be involved with his university journey. It meant a lot to us as parents.”

Description: Jani Gerber Tags: Jani Gerber

Jani Gerber and her dad Jaco Gerber.
Photo: Eugene Seegers

Runs in the family

Jani Gerber is a second-generation Kovsie who hails from Port Elizabeth. She won the cultural division in the Matriculant of the Year competition in 2016 and was invited to join the UFS. According to her, she “didn’t even consider another university”.

Her dad, Mr Jaco Gerber, says: “The whole process of application and registration was very efficient and professional. Jani’s older sister, Anri, completed her MBChB at UFS last year and is currently working at the Pelonomi Regional Hospital. Jani has already been adopted by new friends in her residence. She says, “Some charming students welcomed us at the residence, and even helped out when we were unpacking.” Jani has aspirations to sing in the annual Stagedoor and Serenade Singoff competitions.

We welcome all our first-years and look forward to supporting them throughout their university journey!

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