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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

Student organisation tackles difficult questions in debate
2012-05-12

 

At the debate were, from the left: Danie Jacobs, Head of the Centre for Business Dynamics, Mhlanganisi Madlongolwana, Nombuso Ndlovu and Prof. JP Landman.
Photo: Leatitia Pienaar

 

“South Africa is consumed by a monster, namely the lack of critical thinking and dialogue with regard to our problems. Now is the time to make radical changes.” This is according to Nombuso Ndlovu, who spoke at the first debate in a series of Commercio and the UFS Business School.

“Young people are more interested in social gatherings than applying their minds to the problems of South Africa,” she said. Nombuso is the CEO of Commercio.

Commercio is the student organisation in the Faculty of Economic and Management Sciences. Two teams, one positive and one negative, debated the topic: Is South Africa’s current economic direction viable?

What emerged from the debate was that our students are well-aware of what is going on in our economy and that people cannot just sit back and expect government to deliver. Every individual has a responsibility. South Africa has a “democratic deficit” society, a “corruption-stricken economy” and “economic activism” is necessary to get the economy on the right path.

Prof. JP Landman, Visiting Professor at the Business School, economic advisor, analyst, columnist and also managing director of the Aardklop Arts Festival, was the expert panel member. He said the critical issue in South Africa is “how do you distribute wealth while keeping things going?”

“It is fantastic that South Africans have developed a collective repulsiveness for corruption.” People must know what underpins society and where aggression comes from.
– Leatitia Pienaar.

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