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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

Investec guest speaker exhorts South Campus students to ‘give it their all’
2017-02-16

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The South Campus of the University of the Free State (UFS) recently welcomed new first-year and returning senior students during an event in the Madiba Arena. This year marks another highlight for the campus, with the accommodation of 252 students in a brand-new residence named Legae (meaning “Home”) on the property.

Prof Daniella Coetzee, Campus Principal, reminded the gathered students, “You are a fully-fledged Kovsie, and this is the first day of the rest of your life. You are now going to really work on your dreams.”

She went on to relate the life story of Albert Einstein, renowned physicist, making the point, “When you work, when you persist, when you take it one day at a time, you never lose sight of your dreams, and you will reach your dreams. I can promise you one thing, dear Kovsies, that if you work hard, plan hard, and you put your mind to it, it will definitely be worthwhile.”

Setlogane Manchidi, Head of Investec’s Corporate Social Investments division and guest speaker, told his colourful life story and academic journey. He described his ‘a-ha moment’ in high school, “when the penny dropped and everything started making sense” on a visit to his mother’s employer in Johannesburg, after going to the cinema to watch a movie: “This is the life I want to live.”

Description: 'South Campus Opening Tags: South Campus, Opening
Andrew Tlou, Investec Social Investment; Carol Bunn,
UFS Institutional Advancement; Setlogane Manchidi,
Head of Investec’s Corporate Social Investments division;
Tshegofatso Setilo, UAP Programmes Manager; and
Francois Marais, Director: Access Programmes,
at the South Campus opening and orientation day.
Photo: Eugene Seegers


This led to a new resolve in his scholastic efforts at the rural school back home in Ga-Phahla, Limpopo, and he started studying over weekends and by candlelight at night. Mr Manchidi shared this lesson with the students, “At that point, I lost my so-called ‘friends.’ I learnt this: Peer pressure is real. If you want to deal with peer pressure, surround yourself with the right peers! Surround yourself with people who have your best interests at heart. Surround yourself with people who will not turn you back from your path.” He later succeeded in obtaining a bursary to study at the University of Cape Town (UCT).

Mr Manchidi concluded by exhorting students to aspire to greatness, “Every time you settle for what is expected, you rob yourself of the opportunity to prove yourself out of the ordinary. Choose to exceed expectations. Give it your all!”

 

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