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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 Council adopts guidelines for the development of a new Language Policy

2015-12-04

The Council of the University of the Free State (UFS) adopted the following guidelines from the report by the Language Committee regarding the development of a new Language Policy for the UFS, based on the core values of inclusivity and multilingualism:

that English becomes the primary medium of instruction in undergraduate education and, as largely exists already, in postgraduate education.
that the UFS embeds and enables a language-rich environment committed to multilingualism, with particular attention to Afrikaans, Sesotho, isiZulu, and other languages represented on the three campuses.
that an expanded tutorial system be available to especially first-year students in Afrikaans, Sesotho, isiZulu and other languages, in order to facilitate the transition to English instruction.
that the parallel-medium policy continues in particular professional programmes, given the well-defined Afrikaans markets that, at the moment, still makes such language-specific graduate preparation relevant.
that the language of administration be English.
that the English-medium language policy be implemented with flexibility and understanding, rather than as a rigid rule disregarding the circumstances.

These guidelines were adopted at the Council meeting which took place on the Bloemfontein Campus on Friday 4 December 2015.

“This important and emotive matter was discussed in a high-quality, open debate and I am satisfied with the way the decision was reached,” says Judge Ian van der Merwe, Chairperson of the UFS Council.

The decision by Council comes after a mandate was given to the University Management on 4 June 2015 to conduct a review of the institutional Language Policy. A Language Committee was subsequently established by the University Management Committee (UMC) to undertake a comprehensive review of the existing parallel-medium policy and to make recommendations on the way forward with respect to the university's Language Policy.

The Language Committee conducted a comprehensive consultation process on the future of the Language Policy with all university stakeholders. This included multiple dialogue and submissions sessions, as well as an opinion poll on all three campuses.

Guided by the Council resolution of 4 December 2015, the UFS management will now proceed to design a Language Policy that would be presented to the UMC and Senate for voting purposes again, which vote would be formally presented to Council at one of its governance meetings in 2016. The Institutional Forum, a statutory body that represents all university stakeholders, would also advise Council at that stage, per its mandate, on the new Language Policy.

In the event that a new Language Policy is accepted by Council in 2016, the earliest possible date for implementation would be January 2017.

http://www.ufs.ac.za/templates/news-archive-item?news=6567 (26 November 2015)
http://www.ufs.ac.za/templates/news-archive-item?news=6540 (28 October 2015)
http://www.ufs.ac.za/templates/news-archive-item?news=6521 (20 October 2015)
http://www.ufs.ac.za/templates/news-archive-item?news=6469 (30 August 2015)
http://www.ufs.ac.za/templates/news-archive-item?news=6444 (25 August 2015)

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