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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

Central SRC constitution for UFS approved by Council

2005-07-20

University of the Free State Fact Sheet

1. The Council of the University of the Free State (UFS) on 10 June 2005 unanimously approved the establishment of a Central Student Representative Council (CSRC) to constitute a legitimate basis for the democratic participation of students of all three of its campuses in the governance of the university.

2. In a major breakthrough and transformation step for student governance, the Central SRC will include representatives of the main campus in Bloemfontein, the Vista Bloemfontein campus and the Qwaqwa campus of the UFS.

3. The need to establish the Central SRC follows the incorporation of the Qwaqwa campus into the UFS in January 2003 and the incorporation of the Vista campus in Bloemfontein into the UFS in January 2004.

4. The constitution of the Central SRC is the outcome of a consensus reached during a lengthy process of negotiation between the SRCs of the three UFS campuses, indirectly involving diverse student formations such as Sasco, ANCYL, YCL, Pasma, SASO, SADESMO, AZASCO, SCO, HEREXVII, KovsieAlliance, ACDP, etc. Independent constitutional and political experts facilitated key parts of the negotiation process.

5. In this process, the UFS management went out of its way to ensure the participation of all student formations, especially Sasco and the ANC Youth League, as well as the duly elected SRC officials of the three campuses.

6. With the establishment of a Central SRC, the UFS has adopted a federal student governance model whereby the CSRC is the highest representative student body on matters of common concern for all students. The three campuses of the UFS will retain SRC structures for each campus with powers and responsibilities for matters affecting the particular campus.

7. The central SRC will have 12 members made up of delegates of the different campus SRCs, including the presidents of these three SRCs. In total, the main campus will have 5 representatives, the Qwaqwa campus will have 4 representatives and the Vista campus will have 3 representatives. This ratio ensures a strong voice for the smaller campuses in the central SRC.

8. This arrangement will be reviewed after a year to make allowance for the phasing out of undergraduate (pipeline) students at the Vista campus, as was agreed in the negotiations preceding the incorporation of that campus into the UFS.

9. From these 12 members a central SRC president will be chosen on a quarterly basis to represent the general student body at Executive Management, Senate and Council.

10. The historic official inauguration of the first Central SRC is scheduled to take place in early August 2005.

11. This event, like the adoption of a broadly negotiated new constitution for the main campus SRC, represents a breakthrough in that all three campus SRCs delegations and all relevant student organizations have been part of the process and have accepted the outcome of the process.

20 July 2005

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