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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 increases admission requirements

2010-07-26

Admissions criteria for entry to undergraduate programmes at the University of the Free State (UFS) will be increased with immediate effect. This means that students who begin their undergraduate studies in 2011 will need to meet the new admissions criteria in order to register.

“Increasing admissions requirements is a critical component of our unwavering commitment to excellent academic standards and educational quality at the UFS,” said Prof. Driekie Hay, Vice-Rector: Teaching and Learning at the UFS.

“The challenge of student success at most South African universities is something that has attracted increasing attention over the past few years. We believe that it is our responsibility as an educational institution to admit students that we are confident are likely to be successful, and also to provide the very best quality of teaching and learning to ensure success.”

The university is also acutely aware that large numbers of young people in the country attend schools that are not adequately resourced to provide the quality of schooling needed for successful university study.

“We are thus committed to working with schools and with talented learners in order to address this challenge,” said Prof. Hay.

“The university currently has several initiatives in this regard. Further, our innovative and extremely successful University Preparation Programme (UPP) provides an opportunity for students with potential who do not meet the university entrance criteria to complete a bridging year that prepares them for the rigours of university.”

For students who begin their studies in 2011 the following changes will come into effect:

The minimum requirement for entry into undergraduate programmes will increase from 28 points to 30 points.
The minimum requirement for entry into extended programmes will increase from 23 points to 25 points.
The minimum requirement for entry into the University Preparation Programme will increase from 17 points to 20 points.
Subject-specific requirements specified by faculties will remain the same, except for Natural and Agricultural Sciences (contact the Faculty Manager at 051 401 3199).
All programmes that already require a minimum score of 30 points and above will not be changed.
The minimum entrance criteria for the B.Ed. Foundation Phase and B.Ed. Intermediate Phase will increase from 23 points to 25 points.
The minimum entrance criteria for B.Soc.Sc. Nursing will increase from 28 to 29 points.

Performance in the National Benchmark Tests will be used for placing students into academic support modules as needed.

These test results will not be used for admissions decisions in 2011, except for Faculties where it is used as part of their selection process.
Prospective students are encouraged to submit their applications for study in 2011 as soon as possible.
For telephone enquiries, please dial 051 401 3000.

More information (Pdf document, English and Afrikaans)

Media Release
Issued by: Mangaliso Radebe
Assistant Director: Media Liaison
Tel: 051 401 2828
Cell: 078 460 3320
E-mail: radebemt@ufs.ac.za
26 July 2010

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