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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 Alumni honours four former Kovsies

2008-04-11

The University of the Free State (UFS) will honour four old Kovsies during the Kovsie Alumni Gala Awards dinner on Friday, 16 May 2008.

UFS Alumni chose Juan Smith as the 2007 Kovsie Alumnus of the Year. Dr Sherylle Calder, Dr Derick Coetzee and Prof. André Claassen will each receive the Kovsie Cum Laude Award. This award is made to honour UFS alumni for exceptional achievements and contributions to the UFS.

Juan Smith, member of the victorious World Cup Springbok team and captain of the 2007 Vodacom Free State Cheetahs Currie Cup winners, will receive the 2007 Kovsie Alumnus of the Year award. This award is made to a Kovsie alumnus for outstanding performance on national or international level. Smith made his Springbok debut in 2003 and has received much praise for his contribution to the side since then.

Dr Sherylle Calder and Dr Derick Coetzee will both receive the Kovsie Alumni Cum Laude Award. Both have played a key role in the preparation and conditioning of the Springbok team. Dr Calder has also been highly successful as part of the coaching unit for the English rugby team that won the World Cup in 2003, and the coaching team for the Australian cricket side. She is a pioneer in the field of visual awareness. Dr Coetzee has been the fitness conditioning expert for the Springbok team for the past four years. The success of the team in the World Cup is a testament to his achievements.

Prof. André Claassen will also be honoured with a Cum Laude Award for his contribution in the advancement of the Department of Otorhinolaryngology. He has many personal achievements in his discipline and has received several national and international awards, including one for the first cochlear implants in the Free State. The Cum Laude Award is given to an alumnus for outstanding service or achievement on local, national or international level in his/her field or discipline.

The Gala Awards dinner is a public event and will take place in the Reitz Hall of the Centenary Complex on the Main Campus in Bloemfontein. Microsoft is co-sponsor of the event. Those who are interested in attending can contact Ms Annanda Calitz at 051 401 3382 or alumni@fus.ac.za.

For information regarding the Kovsie Alumni Annual General Meeting, please contact Ms Annanda Calitz 051 401 3382 or Mr Lucas Radebe at 051 401 3751.

Media Release
Issued by: Lacea Loader
Assistant Director: Media Liaison
Tel: 051 401 2584
Cell: 083 645 2454

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