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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

UFS hosts first International Congress on Calvin Research in Africa

2010-08-31

Present at the Calvin Research Conference were, from the left: Dr Frank Ewerszumrode (OP), Faculty of Catholic Theology at the University of Mainz in Mainz, Germany; Prof. Dr Herman Selderhuis, President of the International Congress on Calvin Research; Prof. Dolf Britz, Director of the Jonathan Edwards Centre Africa at the UFS; and Ntabanyane Tseuoa, Masters student in the Jonathan Edwards Centre at the UFS.
Photo: Leonie Bolleurs

The first International Congress on Calvin Research in Africa was this week presented on the Main Campus of the University of the Free State (UFS) in Bloemfontein. This was the tenth Calvin Research Conference presented. The conference is presented every four years.

The theme of the congress was: Reconciliation in the Theology of Calvin. Presentations were made about, amongst others, Calvin’s viewpoint regarding slavery and social justice. There was also a discussion about the extraordinary interest to record the original Calvin texts in databases and to make it available to researchers worldwide.

According to Prof. Dolf Britz, Director of the Jonathan Edwards Centre at the UFS, the objective of the congress was to study original Calvin sources critically. “An important part of the congress’ work is to publish an important part of Calvin’s work in a comprehensive text critical edition. This process is already well advanced and includes a number of unknown texts,” said Prof. Britz.

With its research on Calvin, the UFS emphasises the study of original theological sources. “This approach makes the Faculty of Theology part of the UFS’s strategy towards internationalisation. This is also one of the reasons why the UFS was selected by Yale University in America as partner in the recent establishment of the Jonathan Edwards Centre Africa,” said Prof. Britz, whose brainchild it was to also include young upcoming researchers with the study of original sources and classical languages such as Latin.

The congress was attended by researchers and academics from across the world. Twenty young, emerging researchers formed part of this group that was invited by the UFS. According to Prof. Britz, these young researchers are the top achievers at their respective universities, such as the North-West University, Stellenbosch University, Mukanyo Theological College in the Pretoria area and the UFS.

At this event, attended by more than 70 world-renowned Calvin scholars from countries like, amongst others, Taiwan, Japan, South Korea, Finland, Switzerland, France, The Netherlands, America, Germany and Hungary; UFS academics like Prof. Eric de Boer, Extraordinary Professor in Classical and Reformed Theology and students like Rev. Ntabanyane Tseuoa from Lesotho, read and presented papers as well.

According to Prof. Britz this congress was a very good opportunity to introduce the UFS to the rest of the world.

Media Release
Issued by: Mangaliso Radebe
Assistant Director: Media Liaison
Tel: 051 401 2828
Cell: 078 460 3320
E-mail: radebemt@ufs.ac.za
31 August 2010

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