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Prof Botma Visser takes on rust diseases threatening South Africa’s wheat

09 September 2025 | Story Martinette Brits | Photo Stephen Collett

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.

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Leadership and responsible citizenship: key themes at the Global Leadership Summit

2015-07-09

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Leadership and responsible citizenship have been the main topics of discussion at the Global Leadership Summit which started on 5 July at the UFS Campus in Bloemfontein, and will continue until 17 July. More than 103 international delegates from various universities in Asia, the United States, and Europe, as well as 40 student delegates from the University of the Free State, are attending.

Kick-starting the summit talks was Prof Joel Samoff (Stanford University) who led discussions on transformation in institutions around the world. “Transformation is a constantly-changing interaction. It is not a single objective, but a process, “ he said. This was followed by a robust panel discussion with student leaders of the UFS and those from James Madison University, Mount Holyoke College, and Rutgers University, who described the journey of transformation at their various universities. “Young people are leading themselves in a different way, the context of the society we live in has changed,” said a UFS Student.

Keynote speaker, Zelda la Grange, gave an account of her experiences and the colourful journey of discovery of a “different” South Africa, working with President Nelson Mandela for 19 years, a journey that is the subject of her book, “Good Morning Mr Mandela “. Under the theme “Breathing the same air: A metaphor for human solidarity, Prof Pumla Gobodo-Madikizela, Senior Research Professor in Trauma, Forgiveness, and Reconciliation Studies led a talk with Candice Mama, the daughter of slain anti-apartheid activist, Gelnack Masilo Mama, one of the victims of the former hit squad commander, Eugene de Kok. Candice inspired the audience with her philosophy on life and letting go of trauma: “Forgiveness is a process, and one needs to forgive to be able to be liberated from anger and bitterness,” she said.

Dr Lis Lange, Vice Rector: Academic, UFS spoke of citizenship and freedom, focusing on the responsibility that humans have to create ethical, positive, and meaningful interaction in their daily lives and in their societies across the globe.

As part of the programme, delegates will visit the Qwaqwa Campus on 10 July 2015, where they will interact with the leadership of the campus, its staff, and students, and enjoy an arts and cultural experience of the Eastern Free State. The summit will end with a visit to various sites in Bloemfontein, where delegates will engage in community-based outreach activities in disadvantaged communities around the city.

UFS to host second Global Leadership Summit

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