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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

Shimlas: Unbeaten Varsity Cup Champions!

2015-04-14

Photo: Johan Roux
Spotlight Photo: Spektor Photography
Photo gallery

The UFS Shimlas rugby team made history on Monday 13 April 2015 when they won their first ever Varsity Cup tournament, beating North-West University (NWU) Pukke 63-33 in the final.

Not only did Shimlas make history by winning their first-ever tournament title since the inaugural tournament in 2008, but they did not lose a single game in the 2015 Varsity Cup, thus claiming the cup in front of their home crowd at Shimla Park in Bloemfontein.

Shimlas outscored their traditional intervarsity rivals with nine tries to four. Pukke put the first points on the scoreboard with a penalty kick. The home side started off slowly in the first half. However, Shimlas’ lock, Johan van der Hoogt, did score the first try of the match followed by flyhalf and player that rocks, Niel Marais’s successful conversion kick. Yet, the men from the North-West retaliated full force for the greater part of the first half and, two tries later, had a 18-8 lead over the UFS team.

Shortly after the first strategy break, Shimlas No.8, Niell Jordaan, crossed the try line following a driving maul, but the visitors received another penalty and succeeded with the kick at goal. The last ten minutes before half time saw Shimlas taking advantage, with the Pukke skipper being sent to the sin bin. Wing Maphutha Dolo hit a gap in NWU’s defense, and scored the try that put Shimlas in the lead again. Not long after, Marais sparked in making a play, offloading to flank Daniel Maartens to score a final try before half time, securing a 26-20 lead.

The second half had not been in play too long when the home side crossed the try line again, scoring their fifth try. Marais was again central in creating the play that saw Shimlas outside centre, Nico Lee, putting the points on the board.

NWU fought back again, scoring a pushover try from a scrum. But Shimlas would not give up the lead again, and a well-timed pass from Marais had Lee crossing the line for his second try.

More Shimlas tries piled up from Marais, Dolo, and Maartens, leaving the Potchefstroom side behind 63-25, giving them little opportunity to score again. One desperate consolation try by Pukke in the final seconds did manage to close the gap on the scoreboard, but it was not nearly enough to snatch the title from the hungry and undefeated Shimlas.

FNB Player that Rocks: Niel Marais
Shimlas point scorers:
Tries: Johan van der Hoogt, Niell Jordaan, Maphutha Dolo (2), Daniel Maartens (2), Nico Lee (2), Niel Marais
Conversions: Niel Marais (6)

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