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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

“Leisure can be of great geographical importance”
2013-09-26

 

Prof Gustav Etienne Visser
Photo: Supplied
26 September 2013
 

Prof Gustav Etienne Visser (43) is Professor in Human Geography at the University of the Free State. He has been with the university’s Geography Department since January 2002 and became a full professor in 2009.
Visser completed his MA in Geographical Research at the Stellenbosch University in 1996 and finished his PhD in Geography at the London School of Economics and Political Science in 2000. His thesis was titled: Spatialities of social justice: reflections on South African Cities.

Visser was a Post-doctoral Fellow at the School of Geography, Archaeology and Environmental Studies at the University of the Witwatersrand before his appointment at the UFS. He now teaches Urban Geography to third-year students and Tourism and Development to MA students.

His research interests so far have been Identity-based consumption and urban morphological change, Tourism and development nexus and Critical reflections on South African Geographical Research.

Visser’s publications summary is as follows:

- Four books – edited collections
- 28 book chapters
- 71 refereed articles
- Nine academic commentaries and research notes
- 14 research reports
- and 38 conference papers

His latest research on how people’s leisure time influences our urban spaces, is fundamentally relevant to everyday life.

“We tend to forget to think about it, but how people spend their leisure time is part of their lifestyle,” says Visser.“ And our urban surroundings are influenced by the lifestyles of its inhabitants.”

When asked about his own leisure time and activities, Visser humorously responds “There is no such thing.”

However, he is passionate about eating, cooking and wine.
“I must also watch a series every day – Dexter is definitely my favourite.
“Furthermore, I also travel abroad for about three months of the year, which is mainly for my research concerning urban spaces.”

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