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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

UFS medical students reach out to the community
2011-04-16

 

The smiles on the children at Beyang Bana Pele Creche in Mangaung were blindingly bright, after their new classrooms and playground were unveiled on Friday 15 April. The creche was renovated by a group of third-year medical students from the UFS.
Photo: Earl Coetzee

A group of third-year medical students from the University of the Free State was responsible for many smiling little faces when they unveiled a entirely renovated crèche to its little students on Friday, 15 April.

Reinhardt Erasmus, Fathima Vawda, Veneshree Govender, Antoi Roets, Riaan Calitz, Motlalepula Mabizela, Tertius Potgieter and Chanel van der Westhuizen were the students responsible for the massive renovation work that went into the Beyang Bana Pele Creché in Mangaung.

The students tackled the project as part of a community service project and ensured that the 30 children who attend the crèche can look forward to coming to a safe healthy environment every day.

According to Riaan Calitz, they started the project at the beginning of the year by doing a needs analysis and talking to the children’s parents and teachers. They also involved the aid of an architect and quantity surveyor to calculate the needs of the crèche.

Next, they had to search for sponsors for their work, and struck it lucky when the Windmill Casino agreed to donate R100 000 to their project. They also managed to raise a further R5 000 as well as approximately R50 000 in goods and services donated by various other companies.

This money was enough to improve the safety at the crèche, install safe gas equipment in the kitchen, improve the insulation to ensure a warm winter, install new playground equipment and host several health and safety workshops.

“It took a lot of late nights and early mornings,” Calitz said. “Some of us also had to return from our holiday early, but it was worth it.”

He says the gratitude from the school’s children and teachers, as well as community members, who would stop and thank them for their help while they were busy working, makes it all worthwhile.

The students plan to stay involved with the crèche and say the renovation plan was drafted in such a way that when they move along, another group can simply pick up from their work with ease.

Mrs Sarah Mothoana, the crèche matron, thanked the students as well as everyone who assisted them in “creating a wonderful, safe and healthy environment for the children.”
 

 

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