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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

Gate re-opens to allow limited access
2014-01-29

The end of 2013 has marked the escalation of the university’s stranglehold on crime. With the launch of the B|Smart Campaign, the entire Kovsie community has been sharpening their safety senses.

Amidst this drive towards increased safety on the Bloemfontein Campus, the university has made an interim decision to close one of the gates. As from 1 October 2013, the gate at Badenhorst Street in Universitas near Roosmaryn residence has been closed for traffic.

As the safety initiative is gaining momentum, the matter of the closed gate has recently been reviewed. The university provisionally decided to re-open the gate to grant limited entry for vehicles and pedestrians, with immediate effect.

Only staff and students of the university, and legitimate visitors to the Bloemfontein Campus, will be allowed access. The gate will only be open during weekdays between:

  • 06:30 – 08:30 and
  • 16:00 – 18:00.

No entry will be allowed during weekends, as has been the case in the past.

“A student or staff card will ensure easy access and anybody else would have to validate their reason for entering,” explained Mokgawa Kobe, Director of Protection Services. Legitimate visitors will have to explain or prove their reason for wishing to enter the campus, he said. Absolutely no thoroughfare will be allowed.

Electronic access control is being implemented and as soon as this has been completed, the gate will be fully operational again.

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