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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 council approves guidelines for reconfiguration of Vista Campus

2005-03-15

Human resource development (teaching and training) will be the primary aim of services to be rendered at the reconfigured Vista campus of the University of the Free State (UFS).

This in-principle decision forms part of a set of guidelines for the strategic reconfiguration of the Vista campus in Bloemfontein that was recently approved by the UFS Council. The Vista campus was incorporated into the UFS in January 2004.

“One of the most important aspects that resulted from these guidelines is that we have come to a point where I can say that the future of staff at Vista is not dependant on the strategic reconfiguration of the campus. Vista staff members will stay staff of the UFS and are being integrated into the functions of the main campus,” said Prof Magda Fourie, Vice-Rector: Academic Planning at the UFS.

“According to the guidelines, the reconfiguration of the Vista campus must occur within the ambit of the UFS as a single institution with three campuses,” said Prof Fourie.

The UFS is currently offering two activities on the Vista campus – the regional Centre for Recognition of Prior Learning (RPL) and the Sesotho Language Research and Development Centre.

According to Prof Fourie no duplication of services or programmes being rendered on the main campus in Bloemfontein will take place. In the guidelines suggestions are made that the Vista campus could be used for activities that are currently offered on the main campus (eg short learning programmes), new UFS activities (mainly of a developmental and entrepreneurial nature), cooperative partnership ventures with other role-players and the renting of facilities for education and training purposes.

“However, no definite decisions have been made about these possible activities – the necessary consultation process with relevant stakeholders and role-players must first take place. A consultative forum for this will be established early in the second term of this year,” said Prof Fourie.

“We are excited about the possibilities that have arised from the guidelines as it fits in with our vision to utilise new resources for education and training and to contribute to higher education in the Free State. This will also contribute to the development of human resources as a propelling force in the Central Region,” said Prof Fourie.

MEDIA RELEASE
Issued by: Lacea Loader
Media Representative
Tel: (051) 401-2584
Cell: 083 645 2454
E-mail: loaderl.stg@mail.uovs.ac.za
15 March 2005

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