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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 academic discusses Dutch, Afrikaans and African languages

2006-05-22

During the colloquium presented in Belgium by the Province Antwerp were from the left Prof Pol Cuvelier (University of Antwerp), Prof Theo du Plessis (Director: Unit for Language Management at the UFS), Mr Ludo Helsen (Permanent Deputy: Province of Antwerp) and Mr Jean-Pierre Rondas (Flemish radio journalist).

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UFS academic discusses Dutch, Afrikaans and African languages at international conference

Prof Theo du Plessis, Director of the Unit for Language Management at the University of the Free State (UFS), was the main speaker at a colloquium titled “Routes: Where to now? - Een traject van het Nederlands naar het Afrikaans en de Afrikatalen”, which was recently presented by the Province Antwerp in Belgium.

The aim of the colloquium was to discuss the future cooperation in the field of language between the Province Antwerp and South Africa.

The Province Antwerp is already involved with projects in South Africa. One of these projects is the Multilingual Information Development Programme (MIDP), a partnership project between the UFS and the Free State Province that is mainly funded by the Province Antwerp.

The project has been running since 1999 and was recently in the news with the presentation of a symposium on multilingualism and exclusion on the Main Campus of the UFS. It is hoped that the Routes colloquium will indicate new stages on which can be added to the already successful cooperation in the area of language.

Prof Du Plessis’s presentation titled “Nederlands, Afrikaans en die Afrikatale – kan samewerking slaag? Die geval MIDP in die Vrystaat”, investigated the successes that have been made with the MIDP. He discussed two possible approaches to cooperation in the areas of language, that of a sentimentalistic approach against an instrumentalistic approach.

Cooperation in the first approach makes language the aim. In the second approach language is used as a means to a greater aim. According to Prof du Plessis the first approach is driven by a romantisised idea about the relation between the Flemish and Afrikaans speaking people, which may unfortunately polarise the position of Afrikaans in South Africa even further.

He argues that, given the time that we are in, the second approach will deliver more constructive results as language can among others be used for to further democracy in South Africa. This can happen by cooperation in the institutionalising of multilingualism in our society. The more languages are used in education, law and government administration, the more we can be assured a successful democracy.

The Routes colloquium was facilitated by the well-known Flemish radio journalist, Jean-Pierre Rondas. About twenty South African and Flemish language specialists took part in the colloquium. Dr Fritz Kok, outgoing chief executive officer of the ATKV took part in the opening ceremony and Dr Neville Alexander from the University of Cape Town and well-known activist for multilingualism in South Africa was also one of the main speakers.

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