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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

Excellent facilities, pleasant weather and hospitality attract international teams

2012-03-14

Germany and South Africa played friendly practice matches at the UFS during their training camps.
Photo: Johan Roux
14 March 2012

Three international hockey teams have used the practice facilities of the university since the beginning of the year to prepare for the Olympic Games in August this year. The German and South African hockey teams have practiced here on four previous occasions.

Due to the cold weather in Europe, Austria also held its hockey training camp at the university this year. In addition, four of Austria’s triathlon athletes used the cross country track and swimming pool on the Bloemfontein Campus to prepare for the Olympic Games.

Germany’s national hockey team practised at the university from 3 to 12 March 2012. South Africa made use of the facilities from 5 to 10 March and Austria’s national team has been practicing in Bloemfontein since 24 February. From 3 to 10 March, a club team from Austria also made use of the university’s facilities, including the astros, the swimming pool, the athletics track and the Biokinetics Centre. SV Arminem also played two matches against the men’s hockey team from Kovsies. The first match end 2-2. With the second match Kovsies won 4-1.

Other international hockey teams who have made use of the astros over the past six years include Russia, Argentina, Belgium, China, Azerbaidjan and the Netherlands.

Staff ensured that everything ran like clockwork during the different training camps. Ms Annemarie Ludick and Mr Frans van der Watt, under the guidance of Mr Mickey Gordon, Head: Institutional Promotion, Fundraising, Marketing and Sport, were responsible for the logistical arrangements and finances. Mr Johan Gerber saw to the maintenance of the astros. The university boasts some of the best equipped astros in the world. “Germany, for example, did not bring along any exercise balls, cones, or beds (for use by physiotherapists) because the astros are fully equipped,” said Ms Ludick.

The fact that international teams such as Germany (ranked second in the world), South Africa and Austria made use of the university’s facilities is significant. “The university’s first team got for example the opportunity to play practice games against these players. The training camps also contributed to the economy of Bloemfontein,” said Ms Ludick.

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