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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 hosts Commonwealth universities

2005-08-25

The University of the Free State (UFS) in Bloemfontein will host delegates from 14 universities across the Commonwealth next week as part of a programme to measure and promote excellence in university management.

The workshop will be held from Monday, 29 August to Wednesday, 31 August 2005 as part of the Commonwealth University Management Benchmarking Programme, run by the Association of Commonwealth Universities (ACU).

It is the first time that the UFS will host the workshop and the second time that it is held in South Africa.

“The purpose of the programme is to promote and measure excellence in university management. Unlike other university benchmarking programmes that focus on matters such as research output, the programme run by the ACU follows a process benchmarking approach and aims to identify and promote best practice and quality assurance,” said Prof Magda Fourie, Vice-Rector: Academic Planning at the UFS.

According to Prof Fourie the programme runs on an annual basis and works on a quality improvement cycle. Every year certain areas of university management are evaluated by a panel of international assessors. This year it focuses on strategic planning, recruitment and retention of staff, and branding.
If weaknesses are identified, plans are compiled which should result in an upward spiral of continued quality improvement.

“The UFS has been taking part in the programme for the past five years. Last year we fared particularly well with the evaluation of our change management and engagement with the community,” said Prof Fourie.

“The ACU benchmarking programme is a useful forum in which we can measure ourselves against our peers. It will also help us to prepare for the audit of the effectiveness of our quality assurance policies and systems, which will be conducted in October 2006 by the Higher Education Quality Committee (HEQC) of the Council for Higher Education (CHE),” said Prof Fourie.

Other universities that will take part in the workshop include the Leeds Metropolitan University, the University of Glamorgan in the United Kingdom, the University of Northern British Columbia in Canada, the Central Queensland University, the Monash University in Australia, and the University of the Witwatersrand (Wits).

Media release
Issued by:  Lacea Loader
   Media Representative
   Tel: (051) 401-2584
   Cell: 083 645 2454
   E-mail: loaderl.stg@mail.uovs.ac.za
25 August 2005

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