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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 launches focused research niche areas

2009-11-20

The University of the Free State (UFS) will launch its six research niche areas, the Strategic Academic Clusters, from 23-25 November 2009 on its Main Campus in Bloemfontein.

These Clusters represent a move from a fragmented to a more focused approach to research development at the UFS and will in future direct the University’s research endeavours.

“The UFS is increasingly operating in a competitive environment where South African universities no longer compete only with their national counterparts, but also internationally. With the Clusters the University will follow a focused approach to the strategic selection of niche knowledge platforms and research areas,” says Prof. Frans Swanepoel, Director of Research Development at the UFS.

The Clusters are: Water management in water-scarce areas; New frontiers in poverty reduction and sustainable development; Transformation in highly diverse societies; Technologies for sustainable crop industries in semi-arid regions; Materials and nanosciences; and Advanced biomolecular research.

“The Clusters embody the pursuit of quality and excellence and the name signifies the University’s concern not only with research, but also with under- and postgraduate teaching and learning. The vision is that the Cluster activities will not only drive world-class research outputs, but also contribute to internationally renowned graduate programme activities,” says Prof. Swanepoel.

Each of the Clusters is led by a dedicated director who provides academic leadership, facilitates cutting-edge research, leverages multidisciplinary synergies and coordinates the overall Cluster activities.

Next week’s launch programme will start on Monday, 23 November 2009 with a gala dinner, followed by a plenary symposium on Tuesday, 24 November 2009, during which the Clusters will be introduced.

Several national and international experts in the fields covered by the Clusters will take part in this symposium. They are, amongst others: Dr Danny Walmsley from St Mary’s University in Canada; Dr David Wolfe from Cornell University and Dr David Clark from the National Institute of Health, both in the USA; Mr Mark Ashley from the Desert Knowledge Cooperative Research Centre in Australia; Dr Ian Goldman from the Office of the Presidency in South Africa; Prof Peter Ewang from the South African National Development Agency; Mr Willem Louw from Sasol Technology; and Dr Pumla Gobodo-Madikizela from the University of Cape Town.

On Wednesday, 25 November 2009 each Cluster will present its own symposium.

Media release
Issued by: Lacea Loader
Deputy Director: Media Liaison
Tel: 051 401 2584
Cell: 083 645 2454
E-mail: loaderl.stg@ufs.ac.za
20 November 2009

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