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09 September 2025 | Story Martinette Brits | Photo Stephen Collett
Prof Botma Visser
Prof Botma Visser delivered his inaugural lecture at the University of the Free State, highlighting nearly two decades of research on wheat rust and global food security.

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

Forgive and forget? Or remember and retaliate?
2015-10-08

Cover of the novel Kamphoer

Fact and fiction came together at the Bloemfontein Campus recently to discuss the traumatic repercussions of the South African War. The event forms part of a three-year project – headed by Prof Pumla Gobodo-Madikizela (University of the Free State Trauma, Forgiveness, and Reconciliation Studies) – which investigates transgenerational trauma in the aftermath of the South African War.

The discussion explored the theme, ‘Working through the Past: Reflections on the novel Kamphoer’.

Together, Emeritus Prof Chris van der Merwe (University of Cape Town) and the author of the novel, Dr Francois Smith (University of the Free State, Department Afrikaans and Dutch, German and French), engaged in a thought-provoking, insightful conversation, tracing themes of trauma and issues of forgiveness presented in Kamphoer. Prof Van der Merwe and Dr Smith demonstrated how both fiction and historical fact can inform our present, and guide us into the future.

Emeritus Prof Chris van der Merwe and Dr Francois Smith
discuss the novel Kamphoer and how the book relates to
current issues of transgenerational trauma.

“On a societal level,” Prof Van der Merwe said, “we need to work through trauma by putting it into words, and putting it into a narrative.” When it comes to historical trauma, should we forgive and forget, though? Or rather remember and retaliate? Neither, proposed Prof Van der Merwe. “What I want to plead for is the difficult challenge: remember and forgive.” But Prof Van der Merwe also pointed out that, although forgiveness blesses both the giver and receiver, it is an ongoing process.

Dr Smith agreed wholeheartedly. “One of the discoveries of my book is that forgiving is a continuous process. It’s not something that gets completed at a particular stage in your life. By the same token, you can’t say that you are ever able to leave the past behind.” These issues of trauma, forgiveness, the past versus the present, remembering and forgetting are all integral questions confronting the main character of the novel, Susan Nel .

They are also questions we, as a nation, are currently confronted with, too.

“At this moment in our society,” Prof Van der Merwe said, “we have enough killers. We have a greater need now for caring nurturers.”

 

 

 

 

 

 

 

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