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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 scoops up MACE special award for consistent excellence

2016-12-02

From the left: Martie Nortjé, Lerato Sebe, Thabo Kessah,
Lacea Loader, Lelanie de Wet, Leonie Bolleurs,
Leslé-Ann George, and Mamosa Makaya from the
UFS Communication and Brand Management team
at the MACE Excellence Awards, where they received
two Merit Awards, two Excellence Awards, four Gold Awards,
one Platinum Award, and one Severus Cerff: Special Award.

The Department of Communication and Brand Management at the University of the Free State (UFS) won ten awards during the Excellence Awards of the national association of Marketing, Advancement, and Communication in Education (MACE), held on 24 November 2016 in Cape Town. Hundred and sixty two awards were presented at the event.

At the awards ceremony, the department further received the Severus Cerff Award for demonstrating consistent and outstanding excellence in the 2016 Excellence Awards Programme.

The awards ceremony is part of the MACE Annual National Congress, which took place from 23 to 25 November 2016. The MACE Congress is a platform where experts from the fields of marketing, advancement, and communication share experiences and best practices. This year’s programme included speakers such as Dr Imtiaaz Sooliman, Founder of Gift of the Givers, Ruda Landman, Non-Executive Director of Media24 Limited, and Jonathan Shapiro, well-known cartoonist.

Lacea Loader, Director of the Department of Communication and Brand Management, said, “I am extremely proud of our achievements and I’m privileged to work with such a high-performing team. The fact that we received the Severus Cerff Award for consistent excellence is an additional, exceptional accomplishment.”

Other awards include a Platinum Award, four Gold Awards, two Excellence Awards, and two Merit Awards. Martie Nortjé, Assistant Director: Branding and Merchandise, received a Platinum Award for KovsieGear, the university’s merchandise shop. The Platinum Award is given to all the entries receiving a Gold Award of Excellence in a category, and the best entry in a division receives the award.

Leonie Bolleurs, Assistant Director: Internal Communication, received the Gold Awards for the Sound [W]right UFS student tone and voice guide, the Spaces and Places Video, the Student Bursary Fund Campaign: Photographs as well as the Excellence Awards for the Student Bursary Fund Campaign: Video and the Expanded Footprints Publication. Loader was awarded with the Gold Award for the Facilitation of the review of the UFS Language Policy. This award is given to the highest-scoring entry in every category.

Thabo Kessah, Senior Officer: Internal Communication at the Qwaqwa Campus, and Loader each received a Merit Award for the Ke Eo Taba Qwaqwa Newsletter and Prof Jonathan Jansen’s Commemorative Book: For such a time as this.

Earlier this year, KovsieGear received Gold at the 2016 Prism Awards of the Public Relations Institute of Southern Africa (PRISA). The B Safe Take Action campaign also recently received an award at the African Excellence Awards in Cape Town.

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