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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

Prof Habib addresses inequality at public lecture
2014-08-06

 
One of South Africa’s leading political commentators, Prof Adam Habib, gave a public lecture and launched his latest book on the Bloemfontein Campus on Wednesday 30 July 2014. The event was hosted by the Department of Philosophy in association with Wits University Press and The Southern African Trust.

Prof Habib started his lecture by summarising his book, ‘South Africa’s Suspended Revolution: Hopes and Prospects’. “It is basically about: how did we get where we are today, and how do we get out of the mess we are in?” he said.

His book focuses on South Africa’s transition into democracy and the country’s prospects for inclusive development – which formed the basis of his talk. Prof Habib stressed the issue of inequality facing South Africa and discussed the different approaches to addressing the matter.

“The one approach is that it is simply something we have to live with,” he said. “People who believe this live in a bubble. For example, service delivery protests do not happen because of poverty – it happens because of inequality.”

Prof Habib cautioned against not taking the matter seriously. “Inequality went up consistently in South Africa over the last 20 years. This is however not solely a national challenge, but a global challenge. And South Africa is the frontline of the war on inequality.”

He proposed that the expectations of the rich, rather than the poor, should be addressed.
“We need to moderate expectations. But we can’t moderate the expectations of the poor, if not the rich. We can’t ask the poor to sacrifice what the rich won’t.

“South Africa is once again at a moment of reckoning, where we are forced to make hard choices – in order to make the right choices.”


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