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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

UFS celebrates Kovsie Week

2009-08-21

The University of the Free State (UFS) will be celebrating Kovsie Week from 31 August to 4 September 2009. The week affords friends, colleagues and former colleagues of the UFS the opportunity to enjoy one another’s company and to experience what the university offers.

The programme is as follows:

On Monday, 31 August 2009, a star-gazing programme and lecture entitled “400 Years of Astronomy after Galileo” are presented by Prof. Matie Hoffman at the Boyden Observatory at 17:30 for 18:00. Attendance is free and bus transport will be available from the UFS Main Campus for the first 70 guests that respond. Reserved parking has been arranged with a security guard to look after the cars that are left on the campus.

On Tuesday, 1 September 2009, guests can attend the production by Pieter Venter entitled “Impi” for free in the Wynand Mouton Theatre at 14:30 for 15:00.

On Wednesday, 2 September 2009, an enjoyable morning in the company of Mr Derek de Bruyn from the National Museum is presented at the Centenary Complex of the UFS at 09:30 for 10:00. He will talk about the social life of Bloemfontein during the early 1900s and guests will be entertained by the Boere Orkes of Grey College Primary School under the direction of Santjie Louw. Attendance of this event is free.

On Thursday, 3 September 2009, at 19:00 for 19:30, a candle-light, sherry and soup evening with romantic piano music is presented at the UFS Centenary Complex by Prof. Nicol Viljoen from the UFS’s Department of Music. The programme includes, amongst others, 10 Lieder ohne worte (Felix Mendelssohn), as well as Ballade No. 1 (Fryderyk Chopin). Attendance of this event is also free.

The week will end with the Kovsie-Alumni Award Gala Dinner that will take place in the UFS Centenary Complex on Friday, 4 September 2009, at 18:30 for 19:00.
The cost per person for the dinner is R120. The Kovsie of the Year Award for alumni, the Cum Laude Award, and the Alumni Award for Exceptional Service at the UFS will be awarded at this occasion.

Transport can be arranged to all the functions and parking will be available as close as possible to the venue where the functions take place. Persons interested to attend any of the functions can contact Annanda Calitz at 051 401 3382 or ficka.stg@ufs.ac.za, or Ms Kathy Verwey at 051 401 9343 or verweyke.stg@ufs.ac.za.

Media Release
Issued by: Lacea Loader
Deputy Director: Media Liaison
Tel: 051 401 2584
Cell: 083 645 2454
E-mail: loaderl.stg@ufs.ac.za
21 August 2009

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