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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.

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International ties for OSM

2013-08-21

Prof Nicol Viljoen in the historic Teatr Zdrojowy in Walbrzych, Poland
20 August 2013

Profs Nicol and Martina Viljoen from the Odeion School of Music (OSM) recently undertook a very successful trip to Europe where Prof Nicol Viljoen rendered two solo piano recitals in Poland. They also delivered a joint paper at a congress in Budapest.

The first of the two recitals were held in Crakow at the famed Zespol Panstwowych School of Music. At this event, Prof Viljoen essentially recited Chopin Mazurkas and was invited to repeat this performance in Poland in the future.

The second piano recital was in the historicTeatr Zdrojowy im. Henryka Wieniawskiego in Walbrzych. This concert included Preludes, Mazurkas, as well as the Ballad in G minor by Chopin. After the Mazurkas, the audience rewarded Prof Viljoen with a standing ovasion – and again at the end of the concert. As a result of this, the chief organiser of the event, Jerzy Kosek, who is also the conductor of the Filharmonia Sudecka, invited Prof Viljoen to perform as soloist with his orchestra next year.

Kosek also invited Conducting students at the OSM to work with the Filharmonia under his leadership on an exchange basis. He indicated that he would like to strengthen the ties with the University of the Free State and the Odeion School of Music. Two members of the Filharmonia Sudecka are currently doctoral students in Performing Arts at the OSM, namely Karol Legierski (concertmaster) and Marianne Cilliers (first violin), while the co-concertmaster, Dorota Graca, is in the process of registering for doctoral studies at the OSM.

The paper delivered by Profs Viljoen in Budapest, formed part of the interdisciplinary congress, ‘The Arts in Society,’ where more than twenty countries were represented. Their paper dealt with the post-apartheid oeuvre of the South African composer, Hans Huyssen. Charla Schutte, another doctoral student at the OSM, delivered a paper on an interpretation of indoctrination songs on the basis of an analytical model by the philosopher Johann Visagie.

During the trip, Prof Martina Viljoen also had a productive meeting with the executive manager of Common Ground Publishers, an academic publisher based in the USA, with a view to publish work from the OSM.

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