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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 opens centenary complex

2004-10-12

Today, 12 October 2004, the University of the Free State (UFS) opens the Centenary complex on the grounds of the old Reitz dining hall.

Me Edma Pelzer, Director: Physical Resources and Special Projects at the UFS, said the Centenary complex is furnished mainly for personnel and alumni, just as the Thakaneng Bridge was primarily established as gathering place for students.

On 10 March 2004 the UFS management held the first official function in the half completed complex during the unveiling of the memorial stone by the Rector, Prof Frederick Fourie. What made this occasion remarkable is that old President FW Reitz, 81 years earlier, on 10 March 1923, also laid a memorial stone at the same place, said Ms Pelzer. The complex originally existed of the Reitz dining hall, which was named after old president Reitz, a hostel father residence and administration offices. In historical documents about old president Reitz it is mentioned that already as chief judge he campaigned for the establishment of a university in the Free State and later as president he proceeded with this attempt.

With the opening of the Thakaneng-bridge food preparation and -serving at the Reitz dining hall was discontinued. The kitchen and dining facilities became obsolete. With the evacuation of the old student centre replacements for the Bloemfontein- and Anlgo American-rooms were to be found elsewhere on campus. The idea to convert the historical Reitz building complex in an UFS reception and a space for socialising started to exist.

Ms Pelzer said the UFS is committed to treat its history and its old buildings with respect and to utilise it optimally to enhance the strategic objectives of the university. The Centenary complex must communicate the university as an established, quality institution with an interesting history to visitors. It must serve as a home for alumni and as a one stop visiting point for important visitors who do not have time to experience the whole campus.

In the complex provision is made for entertaining and kitchen facilities, a museum where valuable UFS-memorabilia are kept and exhibited, an amfi theatre and an art gallery which would for the first time offer a permanent home for the art collection of the UFS. Venues will accommodate groups from between 15 to 300 persons.

The reception area will be used by the UFS for occasions such as chancellors’ functions, smaller and bigger receptions for the rector, tea parties after graduation ceremonies, openings of conferences and long service awards. The university also plans to rent out the complex for prestige occasions where the UFS personnel and alumni are involved.

The opening of the Centenary complex form part of the Centenary celebrations of this week. Many of this week’s activities will take place in the complex.

Media release
Issued by: Lacea Loader
Media Representative
Tel: (051) 401-2584
Cell: 083 645 2454
E-mail: loaderl.stg@mail.uovs.ac.za
12 October 2004

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