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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

SRC elections: A first for UFS main campus

2005-08-14

Students on the main campus of the of the University of the Free State (UFS) will this week for the first time vote for the Student Representative Council (SRC) using two voting systems: proportional representation (PR) and first-past-the-post.

According to the Vice-Rector, Student Affairs, Dr Ezekiel Moraka, this year’s elections are a milestone for the UFS as it will be the first time that the main campus SRC will be elected according to the amended SRC constitution, which was approved by the UFS Council in June 2005.

“It is also 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,” said Dr Moraka.

The amended constitution of the main campus SRC determines that nine of the 18 SRC members must be elected by means of proportional representation and nine on the basis of an individual, first-past-the-post election.

According to Dr Moraka, 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.

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, a former SRC President, facilitated the negotiation process,” said Dr Moraka.

Students on the main campus in Bloemfontein will vote for a new SRC on Monday 15 August 2005.

SRC elections will also take place on the other two campuses of the UFS, which have their own SRC structures.

Students on the UFS-Vista campus in Bloemfontein will vote for a new SRC on Monday 15 August 2005 and Tuesday 16 August 2005.

At the Qwaqwa campus of the UFS, students will vote for a new SRC on Friday 26 August 2005.

The election processes on all three campuses will be closely monitored by independent electoral bodies.

After the three campuses have elected their respective SRCs a central SRC will be constituted. The central SRC will have 12 members made up of delegates of the three campus SRCs, including the presidents of these three SRCs. The main campus will have five representatives, the Qwaqwa campus will have four representatives and the Vista campus will have three representatives.

Main campus voting schedule:
Monday 15 August 2005 from 07:00-21:00. Ten voting stations will be set up across the campus. The results will be announced on Tuesday 16 August 2005.

Vista campus voting schedule:
Monday 15 August 2005 and Tuesday 16 August 2005 from 09:00-18:00 in the administration building. The results will be announced on Wednesday 17 August 2005.

Qwaqwa campus voting schedule:
Friday 26 August 2005 from 09:00-18:00 in the Senate Hall. If there is no objection to the final results, it will be announced on the same day.

Media release

Issued by:  Lacea Loader
   Media Representative
   Tel: (051) 401-2584
   Cell: 083 645 2454
   E-mail: loaderl.stg@mail.uovs.ac.za

14 August 2005

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