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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

Prof Jonathan Jansen steps down as UFS Vice-Chancellor and Rector

2016-05-16

Statement by Prof Jonathan Jansen, Vice-Chancellor and Rector of the UFS (pdf)

Statement by Judge Ian van der Merwe, Chairperson: UFS Council

Prof Jonathan Jansen will step down as Vice-Chancellor and Rector of the University of the Free State (UFS) on 31 August 2016.

He will take up an invitation as a Fellow at the Center for Advanced Studies in the Behavioral Sciences at Stanford University in the USA in September 2016. The fellowship, which was awarded to him earlier this year, is an opportunity for him to further advance his career as an internationally renowned academic in education. Prof Jansen’s departure is a great loss for the university, but the Council accepts his decision to step down and pursue his academic career as well as other opportunities.

The Council is grateful for the vision and the inspirational leadership that Prof Jansen provided during his tenure at the UFS. He has led the university through difficult and complex times – from after the Reitz incident up until the recent student protest actions. He brought stability and respect for the university – nationally as well as internationally.

The Council appreciates Prof Jansen’s drive to further the academic performance and transformation of the UFS. To this end he was instrumental in the improvement of student success and graduation rates, the increase in the percentage of academic staff with doctoral qualifications, the increase in research outputs, the growth in staff diversity, and the growth in third-stream income.

Furthermore, Prof Jansen played a significant part in developing the UFS as a place where the embrace of diversity and the integration of the university provide a backdrop for academic excellence. Under his leadership, the UFS made great strides in fulfilling its social responsibility to serve the community. He was the right leader at the right time for the university.

On behalf of the Council and the entire university community, I thank him for his contributions as a capable, energetic and dedicated leader and wish him the best for his future.

Prof Jansen was appointed as Vice-Chancellor and Rector on 1 July 2009 and his term of office was extended for another five years by the Council on 1 July 2014.

In the event that the position is not filled by the end of August 2016, Prof Nicky Morgan, current Vice-Rector: Operations at the UFS, will act as Vice-Chancellor and Rector. The Council will shortly start the process to appoint a successor through a national and international search.

Released by: Lacea Loader (Director: Communication and Brand Management)
Tel: +27(0)51 401 3422/2707 or +27(0)83 645 2454
Email: news@ufs.ac.za | loaderl@ufs.ac.za
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