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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 Centenary 2004/05 : October snippets

2004-10-06

CENTENARY CONFERENCE
The proposed Centenary Conference on Democracy, Diversity and Development : Towards a mature and robust society – A critical discourse, refers. Unfortunately many invited contributors are unable to attend on the proposed dates (12 to 15 October 2004) prompting the UFS management to reconsider the timing of the conference. The UFS management has therefore decided to postpone this conference until an appropriate time in 2005.

As a result of this postponement the SAUVCA activities will also no longer be part of the October programme in Bloemfontein.

CENTENARY COMPLEX
The rehabilitation of the existing Reitz Hall and adjoining residence into the Centenary Complex is almost complete.

The inauguration of the complex – Reitz Hall and DF Malherbe House – will take place on Tuesday, the 12th of October 2004. A special open day from 11:00 until 16:00 is planned to enable all staff and students to visit this prestige complex. More detail will be available early October 2004.

FILM PREMIERE
The premiere of an UFS commissioned documentary, as part of its Centenary celebrations, on the remarkable leadership, reconciliatory and nation-building role of King Moshoeshoe, the Basotho leader of the nineteenth century, will take place on Wednesday, the 13th of October 2004. The director of this commissioned documentary is the well-known Max du Preez. Although this event is open to invited guests only, the documentary will also be screened by the SABC later this year. It will also be screened at several other occasions to enable staff and students to experience and discuss this film.

With this film and other projects the University of the Free State wishes to celebrate the legacy of this extraordinary African leader for the Free State and for South Africa.

CENTENARY HONORARY DOCTORATE GRADUATION CEREMONY
A special Honorary Doctorate Graduation Ceremony will take place on the 14th of October 2004 at 19:00 in front of the Main Building on the UFS campus. Twelve honorary doctorate degrees will be awarded to a diverse group of outstanding South Africans and international scholars. The Rector requests the attendance of all staff and students in large numbers during this prestige event.

The following candidates will receive an honorary doctorate degree: Me Antjie Krog, Prof Jakes Gerwel, Mr Karel Schoeman, Dr Frederick van Zyl Slabbert, Prof Saleem Badat, Dr Khotso Mokhele, Prof Robert Bringle, Prof Leo Quayle, Prof Jack de Wet, Prof Kerneels Nel (posthumous), Prof Boelie Wessels en Prof Jaap Steyn .

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