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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 Psychologist honoured for lifelong contribution

2015-12-09

Prof Dap Louw, distinguished professor and forensic psychologist from the University of the Free State, receives a Lifelong Achievers Award from the University of Johannesburg. From left is: Prof Theo Veldsman, head of the Department of Industrial Psychology and People Management at UJ, prof Louw, prof Deon de Bruin, Department of Industrial Psychology and People Management at UJ, and prof Daneel van Lill, dean at Faculty of Management at UJ.
Photo: Jan Potgieter, UJ

It is always good to be honoured by your own university, but it is even more special to be honoured by another university, according to Prof Dap Louw, distinguished professor and forensic psychologist from the University of the Free State (UFS), on an award he received from the University of Johannesburg (UJ).

On 5 November 2015, Prof Louw received the prestigious Lifelong Achievers Award from the Department of Industrial Psychology and People Management at UJ in recognition of the major contribution he has made during his career in psychology. He was one of two recipients of the award during this year’s UJ Top Achievers Awards Ceremony.

Prof Louw had great appreciation for his students and colleagues at the UFS, without who he would have been “without arms”.

Worthy legacy

The Lifelong Achievers Award is presented to retired academics that have, over their careers, consistently made significant contributions to their field, nationally and/or internationally, and have left behind a worthy legacy.

According to the description for the award, the recipient has left behind a legacy in his or her specific field which is gratefully acknowledged by all past, present and upcoming professional colleagues, students, clients and other stakeholders.

This description concludes with: “We are a better science and profession because of you”.

Career full of highlights

Prof Louw is the author or co-author of over 100 articles in accredited national and international journals, and he is an accredited NRF researcher.

He is the principal author and editor of several textbooks currently prescribed by 12 universities in South and Southern Africa. It is estimated that, over the years, more than 100 000 students have received their training via textbooks he has written with his wife, Prof Anet Louw.

Prof Louw holds a master’s and doctoral degree in Criminology, and a master’s and doctoral degree in Psychology. He is the only person in South Africa with these qualifications.
During his career as forensic psychologist, Prof Louw has testified in many familiar criminal cases in South Africa and Namibia.

The Academy of Science of South Africa presented him with the Stals Award for Psychology and he was honoured by The National Honor Society in Psychology in the USA as well.

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