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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

The King’s Singers: British double Grammy winners hosted by OSM

2017-01-24

The King’s Singers regularly tour in Europe, North and
South America, Asia and Australasia. The group will be
performing in Bloemfontein on 14 February 2017.
Photo: Andy Staples

The King’s Singers, the acclaimed British a cappella vocal ensemble, are coming to Bloemfontein, hosted by the Odeion School of Music at the University of the Free State, for an unmissable performance.

Concertgoers from Bloemfontein and surrounding areas have the opportunity to experience this extraordinary vocal ensemble at the Dutch Reformed Church Universitas at a concert sponsored by the Arts Trust.

Named after King’s College in Cambridge, the group was formed in 1965, and for the past 48 years, their work, synonymous with the very best in vocal ensemble performance, appeals to a vast international audience.

The ensemble has performed for hundreds of thousands of people each season, and regularly tours Europe, North and South America, Asia and Australasia. Instantly recognisable for their immaculate intonation, vocal blend, diction and incisive timing, the King’s Singers are consummate entertainers.

The group’s repertoire has evolved to become one of the most diverse and compelling imaginable. They have commissioned more than 200 works, including landmark pieces from leading contemporary composers including Luciano Berio, György Ligeti, Sir James MacMillan, Krzysztof Penderecki, Toru Takemitsu, Sir John Tavener, Gabriela Lena Frank and Eric Whitacre. They have also commissioned arrangements of everything from jazz standards to pop chart hits, explored medieval motets and Renaissance madrigals, and encouraged young composers to write new scores.

In addition to performing to capacity audiences and creating highly regarded and much-loved recordings, the King’s Singers share their artistry at numerous workshops and masterclasses around the world.

Double Grammy award-winning artists, the group were honoured in 2009 for their Signum Classics release, Simple Gifts, and again in 2012 for their contribution to Eric Whitacre’s Light and Gold album. Recently voted into Gramophone Hall of Fame, rave reviews and repeated sell-out concerts confirm that the King’s Singers are one of the world’s finest vocal ensembles.

Watch videos of the The King’s Singers:
The King's Singers - Overture The Barber Of Seville
2016 Pioneer Day Concert with The King's Singers - Primary Medley
A Christmas Songbook by The King's Singers

Date: 14 February 2017
Time: 19:30
Place: Dutch Reformed Church Universitas, Bloemfontein
Cost: R295 per person | R268 per person for group bookings of 10+

Tickets for the concert are available at Computicket outlets (Checkers, Shoprite shops), at the door, or online.

For inquiries or more information, contact Ninette Pretorius at +27 51 401 2504.

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