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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

HEDSA discusses better services for students with disabilities

2010-09-30

At the gala dinner were, from the left: Anlia Pretorius, Chairperson of HEDSA and Head of the Disability Unit at the University of the Witwatersrand; Dr Blade Nzimande, Minister of Higher Education and Training; Ms Hetsie Veitch, Head of the Unit for Students with Disabilities at the UFS; and Prof. Niel Viljoen, Vice-Rector: Operations at the UFS.
Photo: Leonie Bolleurs

The first ever General Meeting of the Higher Education Disability Services Association (HEDSA) was held on the Main Campus of the University of the Free State (UFS) in Bloemfontein this week. HEDSA is a newly constituted body that represents the Disability Units from the various universities across the country.

The UFS is a member of HEDSA, which aims to work together to promote equal opportunities for students with disabilities in terms of access, participation and success in Higher Education.

The General Meeting forms part of the launching symposium with the theme: New Beginnings and New Directions. The symposium, attended by 15 higher education institutions in South Africa, served as a platform to explore innovative approaches to assist in improving services for students with disabilities.

Dr Blade Nzimande, Minister of Higher Education and Training, was one of the speakers at the gala dinner of this prestigious event. He said that there is still a lot of work to do to overcome discrimination against students as well as staff members with disabilities at higher education institutions. Minister Nzimande quoted from the Soudien report, a government-commissioned report that brought to light discrimination – especially racism and sexism – still endemic at South African universities. “Victims, in this instance referring to students and staff with disabilities, are denied the opportunity – either through a lack of access to opportunities or due to outright discrimination – to realise their full potential. In the process, the country is robbed of valuable but untapped human resources. Higher education institutions cause incalculable damage to South African society by failing to deal boldly with these issues. Where institutions have indeed taken action, the benefits to individuals, to the different social groups in the country, as well as to the institutions themselves, have been major.”

He stated that he believed that HEDSA as well as the symposium could play a vital role that would assist in this process.

Ms Hetsie Veitch, Head of the Unit for Students with Disabilities at the UFS, was elected as treasurer of this body for the following two years. Johnny Mokoka will represent the UFS in HEDSA’s National Student Organisation for Students with Disabilities that was established during the symposium this week.

Media Release
Issued by: Leonie Bolleurs
Strategic Communication
Tel: 051 401 2707
Sel: 0836455853
Email: bolleursl@ufs.ac.za
30 September 2010

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