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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

Eusibius McKaiser gives first talk on new book at Kovsies
2012-05-09

 

Eusibius McKaiser
Photo: Johan Roux
9 May 2012

Students and staff from our university got the first glimpse of political and social commentator Eusibius McKaiser’s new book, There is a Bantu in my bathroom, during a public lecture of the same title held by the author on the Bloemfontein Campus.

McKaiser told the audience that they were amongst the first people to get a preview of his book, a collection of essays on race, sexuality and politics.

His talk centred on domestic race relationships, posing the question whether it was acceptable to have racial preferences with regard to whom you live with. Recounting an incident he encountered while looking for a flat in Sandton, McKaiser said the country was still many kilometres away from the end-goal of non-racialism.

McKaiser, who hosted a weekly politics and morality show on Talk Radio 702, and is a weekly contributor to The New York Times, said the litmus test for non-racialism in South Africa was not what people utter in a public space, but rather what was said in private.

“We need to talk more about the domestic space. In public, we are very insincere and quick to preach non-racialism.”

Recounting conversations he had with Talk Radio 702 listeners on the incident, McKaiser said that preference about whom you live with was not specific to white people’s attitude. He said many of his black listeners also felt uncomfortable living with a white person. “The question is, ‘What do these preferences say about you? What does it say about where we are as a country and people’s commitment to non-racialism?’”

McKaiser was the guest of the International Institute for Studies in Race, Reconciliation and Social Justice.
 

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