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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 honours young researchers

2006-02-10

Some of the guests attending the recognition function were from the left: Prof Magda Fourie (Vice-Rector: Academic Planning at the UFS), Mr Joseph Smiles (lecturer at the UFS Department of Political Science and Thuthuka grant holder), Prof Frans Swanepoel (Director: Research Development at the UFS) and Dr Carlien Pohl (lecturer at the UFS Department of Microbial, Biochemical and Food Biotechnology and Thuthuka grant holder).
Photo: Leonie Bolleurs

The guest speaker was Prof Jonathan Jansen, Dean: Faculty of Education at the University of Pretoria (UP). He gave tips to young and promising researchers on how to be an outstanding scholar.
What is a Scholar

UFS honours young researchers

The University of the Free State (UFS) last night honoured 24 young researchers who are taking part in the National Research Fund’s (NRF) Thuthuka programme.

The recognition function is the first of its kind at the UFS. “The renewed focus on research development that was recently announced at the official opening of the UFS by the Rector and Vice-Chancellor, Prof Frederick Fourie, is an indication of the institution’s endeavour to create an environment in which research can be improved and flourish. This can only be obtained when researchers are being valued and that is why it is important to honour our young researchers,” said Mrs Annelize Venter, researcher at the UFS Research Development Directorate and coordinator of the programme.

The focus on research was also touched on recently by President Thabo Mbeki during the opening of Parliament when he said: “We will continue to engage the leadership of our tertiary institutions focused on working with them to meet the nation’s expectations with regard to teaching and research. For its part, the government is determined to increase the resource allocation for research and development and innovation, and increase the pool of young researchers."

According to Mrs Venter, research done in 2004 shows that the majority researchers who publish are white males above the age of 50. “Many students who undertake magister studies choose not to conduct research, but rather to do a thesis and additional subjects. This means that research is not stimulated. Students also find it difficult to obtain financial support for postgraduate studies,” she explained.
“Thutuka is a capacity building programme of the NRF that is aimed to
fund and support the qualifications of women and young black scientists and other researchers who do not have a rating for postgraduate research. It is based on a funding partnership between the UFS and the NRF,” said Mrs Venter.

Last night Prof Frans Swanepoel, Director: Research Development at the UFS, added to his by saying: “With the Thuthuka programme we aim to create and sustain a research culture at the UFS, promote international research and train researchers of a high quality and enhance the research capacity at the UFS by focusing on women, black researchers and other promising researchers.”

The programme was started by the NRF in 2001. At that stage only 17 grants were made countrywide. Last year 370 postgraduate students took part in the programme.

According to Mrs Venter the programme was implemented at the UFS in 2003. “At that stage we only had 5 grant holders. This year there are 24 Ph D and magister students on the programme,” she said.

A couple of young promising researchers, who will be participating in the programme in 2007, also attended last night’s recognition function.

The guest speaker was Prof Jonathan Jansen, Dean: Faculty of Education at the University of Pretoria (UP). He gave tips to young and promising researchers on how to be an outstanding scholar.

Nine professors were also congratulated with their promotion to senior research professor, namely Proff Louise Cilliers (Department of English and Classical Languages), James du Preez (Department of Microbial, Biochemical and Food Biotechnology), Johan Grobbelaar (Department of Plant Sciences), Dingie Janse van Rensburg (Centre for Health Systems Research and Development), Dap Louw (Department of Psychology), Philip Nel (Department of Afro-asiatic Studies and Language Practice and Sign Language), Louis Scott (Department of Plant Sciences), Dirk van den Berg (Department of History of Art) and Andries Raath (Department of Constitutional Law and Philosophy of Law).

Media release
Issued by: Lacea Loader
Media Representative
Tel: (051) 401-2584
Cell: 083 645 2454
E-mail: loaderl.stg@mail.uovs.ac.za
10 February 2006

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