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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

A guide and a friend
2016-12-12

Description:Khothatso Mokone  Tags: Khothatso Mokone  longdesc=

Louzanne Coetzee and Khothatso Mokone.
Photo: Charl Devenish

Behind every successful Paralympic athlete is a guide, and behind blind athlete Louzanne Coetzee is none other than former Kovsie student Khothatso Mokone.

Mokone, who is a sports journalist and freelance photographer, says he is not entirely sure that his busy schedule is very balanced, but he tries to ensure he squeezes as much as possible into his day. One thing he always makes time for is his training. “As a young person, I try to take every opportunity that comes my way,” he says.

This young runner, who has been Coetzee’s guide for the past eight months, says that every race they have run together thus far has always been better than the last. “The partnership grows harmoniously every day. We talk about almost everything there is, not only running,” Mokone says.

Mokone guided Coetzee in the 1 500m of the Paralympics in Rio de Janeiro in September this year when she was disqualified. 

Mokone, who loves comedy and Dubai, is inspired by SAfm journalist and presenter Ashraf Garda. “He talks a lot about current issues that affect our country and I like his style of presenting. He is a good orator.”

Something people may not know about him is that he always walks around hopeful that the best is yet to come. “When I walk down the street, I walk with confidence and people think I have made it in life not knowing that I only have hope for a better tomorrow,” he says.

Although he is not yet as successful as he would like to be, Mokone encourages the youth to “open their eyes and ears to set realistic goals and work with patience to achieve each goal, whether short or long term”.

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