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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

Max du Preez on South Africa’s leadership vacuum

2011-08-29

Present at the CR Swart Memorial Lecture was, from the left: Prof. Hussein Solomon, senior Professor in our Department of Political Science; Prof. Theo Neethling, Head of our Department of Political Science; Max du Preez and Prof. Lucius Botes,Dean of our Faculty of Humanities.
Photo: Stephen Collett

“Much has been going wrong in South Africa in the last few years and it’s all due to a lack of strong, visionary leadership. South Africans deserve better and should demand more integrity, courage and vision from the present political leadership,” veteran journalist and author Max du Preez told the audience at a packed Wynand Mouton Theatre at our university, on 25 August 2011.

Delivering this year’s CR Swart Memorial Lecture on the topic “Of Jacob, Julius, Jimmy and the Dancing Monkey”, Du Preez told the audience to look with much more critical eyes at the political leadership and decide who is doing the obvious, following his or her basest instincts or simply trying to play to the gallery. “Why look at a man like Julius Malema and let him upset us, why listen to Floyd Shivambu with his crude manners and let them define us?” Du Preez asked the more than 300 people attending the memorial lecture. The CR Swart Memorial Lecture, the 41st hosted by the UFS, attracted one of the largest crowds ever for a public lecture, with some people sitting on the steps inside the auditorium of the Wynand theatre.

Telling the story of African philospher Morena Mohlomi, who acted as a teacher to Basuto king Moshoeshoe, Du Preez told the audience that the country needs counter-intuitive leadership like the two leaders had demonstrated. Calling Mohlomi southern Africa’s first Pan Africanist, Du Preez said the extroadinary thing about Morena Mohlomi and his student was their gift of counter-intuitive leadership, leadership that was daring and visionary, leadership that did not simply do the obvious. Pointing out other visionary leaders like Nelson Mandela, Oliver Tambo, Walter Sisulu, Beyers Naude and Van Zyl Slabbert, Du Preez urged the audience to question “the quality of leadership of Cosatu, the Democratic Teachers Union that is messing up our education, the Communist Party, the Democratic Alliance, the Freedom Front Plus and Solidarity. If they don’t live up to our expectations, why do we still tolerate them?” Du Preez asked.

Du Preez also commended Prof. Jonathan Jansen, Vice Chancellor and Rector of the UFS, for his counter-intuitive leadership regarding the Reitz Residence incident and said Prof. Jansen’s solution, as controversial as it was, brought a much better outcome.

Please find attached the full speech of Max Du Preez.

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