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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

An incident-free recess for the UFS

2010-07-19

The improved security measures at the University of the Free State (UFS) have resulted in an incident-free recess on the Main Campus in Bloemfontein during the 2010 FIFA World Cup and the annual Volksblad Arts Festival.

The UFS provided accommodation for international spectators visiting the country for the World Cup and recently also hosted the hugely popular Volksblad Arts Festival without any security glitches.

These successes could be attributed to the hard work of staff members from various divisions at the UFS to ensure that the security was improved.

“The main question we had to deal with was: should our Main Campus be fenced off? This matter had been under discussion for quite some time. In order to ensure the feasibility thereof, a second impact study was done by a consulting engineer,” said Prof. Niel Viljoen, Vice-Rector: Operations at the UFS.

“This study has shown that, given the nature of activities on the campus and the access configuration, it would be difficult, if not impossible, to effectively control access to the campus, especially as far as visitors were concerned. Any type of access control measure would result in delays at the gates, which could have a major impact on the traffic flow, delays, costs and emissions.”

“It is important that our staff and students feel safe on the Main Campus, whether they are walking on campus or working in their offices. In that way we can ensure an environment that is conducive to staff and students to work and study,” he said.

Various measures are being implemented to make the campuses safer. These include, among others:

The installation of alarms in buildings on the Main Campus. The project for the South Campus has been completed and the installation of a new alarm system on the Qwaqwa Campus will start soon.
Staff and students will be required to wear identification cards once the new identification system has been put in place. These cards will allow access to all buildings.
Fences around the Main Campus are being repaired and the areas around these fences are being cleaned. This project should be completed by August 2010.
Lights will be installed in badly lit areas on the Main Campus. The first phase of this project includes the area between the Mooimeisiesfontein, Welwitschia and Vergeet-my-nie residences. This project will also be completed by August 2010.
The walkways on the Main Campus will be patrolled more frequently and effectively.
Contracted security workers will be utilised more effectively.
The monitoring of security cameras on the Main Campus on a 24/7 basis. “For this purpose the security room of our Protection Services is in the process of being upgraded,” said Prof. Viljoen.

The possibility of placing security cameras and panic buttons in parking areas and walkways is investigated.

Media Release
Issued by: Mangaliso Radebe
Assistant Director: Media Liaison
Tel: 051 401 2828
Cell: 078 460 3320
E-mail: radebemt@ufs.ac.za
16 July 2010

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