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09 September 2025 | Story Martinette Brits | Photo Stephen Collett
Prof Botma Visser
Prof Botma Visser delivered his inaugural lecture at the University of the Free State, highlighting nearly two decades of research on wheat rust and global food security.

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

Physical Planning lives in recaptured space
2014-06-18

When the Department of Physical Planning decided on a new office premises, the team decided to tackle the project with an overarching theme – recycling.

It is important for Physical Planning to not only dictate to other departments on campus, but to set the example themselves,” says Nico Janse van Rensburg, Director: Physical Planning at the UFS. 

Recaptured space

New office space on campus is simply not available. It was therefore decided to recover space and a store room was identified. “Fortunately, the storage area had ceilings. However, it was dilapidated and was sagging all over. To divert attention from the ceiling, we painted it in a dark colour and the walls white.

“All wiring was also done superficially. It draws the attention away from the uneven surfaces and simplifies work on the wiring. Instead of trying to hide it, we made a focal point of it,” says Janse van Rensburg.

Recycled building materials

Lots of the building material that was used to convert the storage space into offices, was recovered from other building projects on campus. Material that would normally be discarded was utilised creatively to not only serve a practical purpose, but also an aesthetic one.

A laboratory basin was used as wash basin. Remaining parts of granite slabs from other sites were utilised as top for the basin. Existing toilets were also reused. To enhance the atmosphere, new taps in an affordable, but durable range were installed.

Recycled furniture

We rambled through every possible store room to find furniture. Tables were simply sanded and varnished and look better than new. Even the cabinet at the entrance was saved from wind and weather and reused.

Hot and smart

Only one screen wall was built. It was left in raw brick, unplastered and unpainted to contribute to contrasting textures. Existing walls were left painted or unpainted as it was before.

“The environment that was created breaks down several existing perceptions. Such as the perception that everything has to match; everything has to be plastered and painted and many others. This is an example of how different materials can be combined to create a lively environment.

“Staff members have already moved into their new offices and are very satisfied,” says Janse van Rensburg. 

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