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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

SA women’s Hockey players give a recount of Hockey World League

2015-07-02

Nicole Walraven and Liné Malan
Photo: Hatsu Mphatsoe

Three of the star players of Kovsies Hockey formed part of the South African Women’s Hockey team, which competed at the Hockey World League (HWL) tournament in Spain.

Hatsu Mphatsoe, student assistant at the Department of Communication and Brand Management, spoke to Nicole Walraven and Liné Malan. Tanya Britz will be returning only at a later stage to South Africa.

As key players in the Kovsies women’s team, Malan and Walraven (along with Britz) have a new wealth of knowledge that could assist the team in their forthcoming USSA tournament. Here are some of the sentiments they had to share:

What was your reaction when you first received the news that you’d be representing the country in Spain?

Liné: “It was a shock to me, I honestly didn’t expect it. At the same time, I was extremely excited to be granted the opportunity to represent my country, and prove my worth to the team.”

Nicole: “I was so excited and felt honoured! To represent my country at such a big tournament is amazing. I was very nervous, but excited.”

How has playing at an international level improved your personal performance and mentality of the game/sport?

Nicole: “Playing at such a high level has helped my hockey immensely. It has helped me read the game better, it has upped my self-confidence, and it has also improved my ability to deal with pressure.”

Liné: “Playing at an international level looks much easier than it is. It is a much faster game, the pressure on the ball is much higher, and the individual skills are on a different level. It has helped me to lift my game, and make decisions much quicker. It has honestly benefitted me as an individual, and I’ve learnt so much from the experience.”

Now that you’ll be going to play at the USSA tournament, what new perspectives do you wish to bring to the team in order to improve its overall performance there?

Nicole: “The importance of teamwork as well as adapting the game plan according to the situation and the opposition. Constant hard work and a never-give-up attitude are vital. One quote that stood out from the tournament is ‘1MT, 1MT’ which stands for ‘1 More Thing, 1 More Time’.

Liné: “Going to USSA, I now have a better understanding of what pressure is, and how to make better decisions. We will still make use of our Kovsies brand of Hockey, which is our passing game, and apply all aspects to the best of our ability.”

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