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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

New SRC constitution for UFS main campus agreed upon by all organisations

2005-07-20

University of the Free State Fact Sheet

1. The Council of the University of the Free State (UFS) unanimously approved an amendment to the SRC constitution for the main campus to allow for the introduction of proportional representation (PR) alongside a first-past-the-post electoral system.

2. This decision was taken by the UFS Council on 10 June 2005 at the same meeting where it also approved the establishment of a Central SRC for the three campuses of the UFS.

3. The new main campus SRC constitution is the result of consensus reached during a lengthy negotiation process involving diverse student formations such as Sasco, the ANC Youth League, the Young Communist League, the ACDP, HEREXVII, KovsieAlliance, as well as the democratically elected SRC members of the main campus. Independent persons such as Mr Jack Klaas and Mr Kobus van Loggerenberg facilitated the negotiation process.

4. The consensus reached during this process, and the subsequent decision by Council, represent a major breakthrough for student governance and transformation of the UFS main campus and constitutes a legitimate basis for the democratic participation of all students at the UFS main campus in the governance of the university.

5. The introduction of the proportional representation system follows earlier calls by some student formations, notably Sasco and the ANC Youth League, for such a system to be introduced at the UFS main campus in Bloemfontein.

6. In terms of the amendments to the main campus SRC constitution, nine of the 18 SRC members are to elected by means of proportional representation and nine on the basis of an direct, first-past-the-post election.

7. The following portfolios of the main campus SRC will be contested by individual candidates on the basis of “first past the post”:
• president
• secretary
• academic affairs
• legal and constitutional affairs
• student development
• arts and culture
• men’s internal liaison
• ladies internal liaison
• media, marketing and liaison

8. The following nine portfolios will be contested by affiliated organizations on a proportional representation basis.
• two vice-presidents
• treasurer
• dialogue and associations
• transformation
• campus affairs and recreation
• sport
• international affairs
• community service

9. These two decisions regarding student governance represent a breakthrough in that, for the first time in many years, all SRC constitutional changes were processed and approved by the June meeting of the Council, well in time for the scheduled August SRC election; in addition, all relevant student organizations have been part of the process and all have accepted the outcome of the process.

20 July 2005

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