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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

"Participation without insight leads to pronouncements without prospects"

2004-08-30

Taking the poor off the streets and encouraging their participation in the planning process is not always empowering them but it might be robbing them of their power, said Prof Das Steyn, of the Department of Urban and Regional Planning at the University of the Free State (UFS).

Speaking on public participation in the planning process during his inaugural lecture, Prof Steyn said this meant that people in the streets sometimes have more power than people in the system.

“Public participation is an overgeneralization that is often defined as providing citizens with opportunities to take part in governmental decisions and planning processes. But there must be a balance between power and responsibility,” he said.

According to Prof. Steyn, public participation in town planning plays a vital role and can be both deliberation and participation.

After 1994 there was a widespread insistence on democracy, and legislation passed since then was based on the belief that the community must be involved in the planning process.

He said the experience of the Department of Urban and Regional Planning at the UFS was that in some cases people showed lack of interest in public participation.

He believed that the aim of public participation is to improve the effectiveness of planning and that public participation democratises project planning.

“Public participation can help us know how the public feels about certain issues. It has the potential of resolving a conflict, but this is not guaranteed,” Prof Steyn said.

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