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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

Law students rated among the top in the world

2007-04-18

The UFS team that competed in the moot arbitration competition in Austria was, front from the left: Sunette Visser and Dee Leboela; back from left: Lucian Companie, Vicky Olivier and Deman Smit.

UFS Law students rated among the top in the world

A team of eight students from the Faculty of Law at the University of the Free State (UFS) has put the university among the top universities in the world when it was ranked 46th out of 177 universities that recently took part in the Willem C. Vis International Commercial Arbitration Moot competition in Vienna, Austria.

Universities from more than 55 countries took part in the competition and 1 800 arguments were delivered over a period of seven days. The UFS team competed against countries such as Switzerland, Russia, Lapland and France.

The team did exceptionally well in all the arguments and was complimented on oral performance and litigation skills. “In the final round, one of the arbitrators, who is a practising international trade lawyer and arbitrator, said that the team’s oral arguments were of exactly the same standard as that of practising international trade lawyers in real arbitrations,” said Prof. Elizabeth Snyman-Van Deventer, coach of the team and lecturer at the Department of Mercantile Law.

To put the cherry on top, one of the team members, Deman Smit, received an individual oralist award and an honourable mention as one of the best speakers. His score of 138 out of 150 placed him within three (3) points of the international individual winner.

The Dean of the Faculty of Law, Prof. Johan Henning said: “The fact that Deman missed out on receiving the top speaker award by a couple of points is a striking example of the world class students this faculty is delivering. It also shows that the faculty needs not to stand back for law faculties such as those of Harvard, Freiburg, Munchen, Stanford and Sorbonne.”

The Willem C. Vis International Commercial Arbitration Moot is an annual competition organised by the Institute of International Commercial Law at the Pace University School of Law in New York, United States of America. The goal of the competition is to foster the study of international commercial law and to train students in methods of alternative dispute resolution.

“The Faculty of Law also sees this competition as part of our development strategy to develop skilled arbitrators for commercial disputes. There is a need in Africa for commercial lawyers to facilitate international trade. This programme is also in line with the development strategies of the African Union,” said Prof. Snyman-Van Deventer.

The UFS team comprised of: Dee Leboela, Smit, Lucien Companie, Vicky Olivier, Sunette Visser, Qaqamba Vellem, Hanno Bekker and Lucy Nthotso.

Media release
Issued by: Mangaliso Radebe
Assistant Director: Media Liaison
Tel: 051 401 2828
Cell: 078 460 3320
E-mail: radebemt@ufs.ac.za
18 April 2007

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