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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

Interpreting implemented at UFS residences

2007-10-12

The University of the Free State (UFS) has begun to implement interpreting services at student residence meetings on the Main Campus in Bloemfontein, as part of the management of diversity and the racial integration of its residences.

As a pilot project, the interpreting services are being offered since the third term at Emily Hobhouse and Roosmaryn ladies residences, where a significant racial diversity already is present. From next year this service will be extended to all the student residences on the Main Campus.

The interpreting project is being managed by the Department of Afro-asiatic Studies, Sign Language and Language Practice at the UFS.

“Students in training at the Department of Afro-asiatic Studies, Sign Language and Language Practice and senior interpreters from the UFS are currently interpreting during residence meetings,” said Prof. Jackie Naudé, Departmental Chairperson of the UFS’s Department of Afro-asiatic Studies, Sign Language and Language Practice.

“Students in these residences are given the opportunity to be trained to interpret during their residence meetings. Four students from each hostel are being trained as interpreters,” said Prof. Naudé.

According to Prof. Naudé both residences have meetings that take place on a Monday evening at 22:00. Interpreting is also provided at the first-year students’ meetings at Emily Hobhouse on Tuesday evenings.

The interpreters experience the interpreting at the residences as positively and they experience that students often do utilise this service. At Roosmaryn 16-18 students are utilising the interpreting service, while at Emily Hobhouse approximately 18 students are utilising the service.

“The interpreting service definitely contributes to the enhancement of communication during residence meetings. Students can exactly follow what is happening during the meetings. In the past a residences like Emily Hobhouse tried to repeat everything in English, which extended the meetings,” Prof. Naudé said.

With the envisaged extension of interpreting services in hostel meetings to all the hostels on the Main Campus in Bloemfontein, there is a need for interpreters as these meetings will take place simultaneously. Through this initiative, exiting new opportunities are created for aspiring interpreters. The training takes place under leadership of Prof. Annelie Lotriet who holds the ATKV Chair in Interpreting in the department.

Aspiring candidates can contact Mr Cobus Snyman, Manager of the UFS’s interpreting projects at 051 401 9005 in connection with the selection criteria for interpreters.

Media Release
Issued by: Lacea Loader
Assistant Director: Media Liaison
Tel: 051 401 2584
Cell: 083 645 2454
E-mail: loaderl.stg@ufs.ac.za
14 October 2007

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