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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.

News Archive

21 Icons: 21 Years of Freedom Collection at the University of the Free State

2015-09-02

In Prayer and Protest - Sophia Williams De Bruyn

The Johannes Stegmann Art Gallery, in partnership with 21 Icons, is hosting the 21 Years of Freedom Collection, an exhibition specially curated for the University of the Free State.
21 Icons celebrates a heroic past and inspires a hopeful future. The project was launched in 2013 as an initiative that uses film, photography and written narrative to celebrate the lives of extraordinary South Africans. It highlights people who have been catalysts in shaping society, on a local or global level and across a variety of contexts: in a social, political, environmental or artistic sense.

It is the brainchild of internationally renowned photographer and filmmaker Adrian Steirn, whose primary source of inspiration was the life of Nelson Mandela. In one way or another, all of the men and women featured in the project have extended his legacy, making a magnificent impact on South Africa and beyond.

Beautiful Sacrifice - Albie Sachs

21 Years of Freedom features 21 icons from the first and second seasons of the project. It includes the last official photographic portrait of Nelson Mandela and many of his friends and fellow struggle heroes. Behind each portrait lies a carefully planned concept that captures the essence of each icon, capturing their spirit and distinct legacy.

Among the other extraordinary South Africans featured in this collection, are struggle icons Ahmed Kathrada and Advocate George Bizos, Archbishop Desmond Tutu, human rights and environmental activist Kumi Naidoo, celebrated storyteller Gcina Mhlophe, Nobel laureate Nadine Gordimer, activist and musician Yvonne Chaka Chaka, gender activist Sophia Williams De Bruyn and artist William Kentridge.

The Full Report - Zubeida Jaffer

The 21 Icons was created as a movement for positive change. By sharing the stories of iconic South African men and women, the intention is to inspire new generations to follow in their footsteps. With the country celebrating 21 years of democracy but still grabbling with injustices, the message that everyone can do something to make a difference, is portrayed in these powerful and inspiring stories.

Writer-in-residence and well-respected journalist, Zubeida Jaffer, who features among the collection of 21 striking photographs, opened the exhibition saying, “I feel like I’m surrounded by a circle of energy from which I have been fortunate to draw strength …It’s a choice that we make…whether to draw energy from those who are positive and forward looking or to surround ourselves with people who are fearful. There is a lot to be fearful about in our country. We have lived through very fearful and difficult times. But to cope with these times, those people and many others have kept their focus on hope. They have kept their focus on what is possible…and what we would like South Africa to be in the future.”

For more information on 21 Icons: 21 Years of Freedom Collection contact the Johannes Stegmann Art Gallery at +27 (0)51 401 2706 or dejesusav@ufs.ac.za

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