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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

Music programme receives a boost

2004-08-20

Back standing fltr: Mr Peter Guy - Founder and coordinator: Mangaung String Program and snr lecturer at the Musicon; Mrs Francine Duvenage, Manager: Human Resources, Wesbank. Middle fltr: Prof Frederick Fourie, Rector and Vice-Chancellor of the UFS; Mr Apie Otto, Area Manager: Vehicles, Wesbank Free State and Northern Cape. Front fltr: Mr John Minaar (17), Gr 12 Sand du Plessis Secondary School; Repiloe Olifant (14) Gr 10 Navalsig Secondary School; Moeketsi Khang (16) Gr 11 Tsoseletso Secondary School; Stella Benbooi (12) Gr 7 Bochabela Primary School.

The Mangaung String Programme, a partnership between the University of the Free State (UFS) and the Free State Musicon, an institution that falls under the auspices of the Free State Department of Sport, Arts, Culture, Science and Technology, has recently received heartened encouragement when an amount of R342 000,00 was granted to the programme by the Wesbank/First Rand Foundation for the purchasing of a bus.

“Transporting the children who are part of the programme back and forth for tuition and rehearsals has been a major problem as most of them stay in the townships on the outskirts of Bloemfontein ,” said Mr Peter Guy, founder and coordinator of the programme.

“The bus will ensure that those children who have the passion, dedication and commitment can spend every afternoon if they so choose practicing, learning about music and rehearsing with children from all over Bloemfontein,” said Mr Guy.

Mr Guy, a Senior Lecturer at the Musicon, started the programme in 1998 with funding from the Musicon Parents Teachers Association, initially with 15 pupils - today 150 children participate in the programme. In 2002 the UFS formed a partnership with the Free State Musicon in the provisioning of facilities, tuition and musical instruments. “Since the involvement of the UFS, the programme has almost tripled in size and one

fulltime teaching position is now jointly funded by both institutions,” said Mr Guy.

According to Mr Guy the Free State Symphony Orchestra has committed itself to providing opportunities for gifted young players from all backgrounds to perform, develop their talents and to grow musically. Some of the children of the Mangaung String Programme will soon be joining the Free State Symphony Concert in concerts.

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

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