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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

Centre for Africa Studies goes quadruple
2014-09-02

The Centre for Africa Studies at the UFS hosted a book launch on 27 August 2014. Prof Heidi Hudson expressed her excitement as she welcomed the audience and authors that evening, “This has not happened yet at our department where we launch four books at the same time, thus it is a happy and glorious moment for us.”

Book 1: Sacred Spaces and Contested Identities. Space and Ritual Dynamics in Europe and Africa. Edited by Paul Post, Philip Nel and Walter van Beek.

This book deals with the fundamental changes in society and culture that are forcing us to reconsider the position of sacred space, and to do this within the broader context of ritual and religious dynamics and what is called a ‘spatial turn’. Conversely, sacred sites are a privileged way of studying current cultural dynamics. This collection of studies on sacred space concerns itself with both perspectives by exploring place-bound dynamics of the sacred spaces in Africa and Europe.

Book 2: Understanding Namibia. The Trials of Independence. Written by Henning Melber.

This study explores the achievements and failures of Namibia’s transformation since independence. It contrasts the narrative of a post-colonial patriotic history with the socio-economic and political realities of the nation-building project.

Book 3: Peace Diplomacy, Global Justice and International Agency Rethinking Human Security and Ethics in the Spirit of Dag Hammarskjöld. Edited by Carsten Stahn and Henning Melber.

This tribute and critical review of Hammarskjöld's values and legacy examines his approach towards international civil service, agency and value-based leadership, investigates his vision of internationalism and explores his achievements and failures as Secretary-General. The book is also available in print. Melber is a Senior Adviser and Director Emeritus of The Dag Hammarskjöld Foundation, Uppsala, Sweden. He is also Extraordinary Professor at both the University of Pretoria and the Centre for Africa Studies, University of the Free State.

Book 4: Au commencement était le Mimisme: Essai de lecture globale des cours de Marcel Jousse ( In the beginning was mimism: A holistic reading of Marcel Jousse’s lectures). Written by: Edgard Sienaert

This publication allows us to hear the voice of Marcel Jousse, professor of Anthropology of Language, who taught in Paris between 1931 and 1957. Edgard Sienaert, after having edited and translated in English all publications of Jousse, returns here to Jousse’s one-thousand lectures, synthesised through the lens of an anthropology of human mimism. Jousse’s train of thought leads us to question our own thought categories stuck in antagonisms: spirit and matter, concrete and abstract, body and mind, science and faith. Sienaert is currently a research fellow at the Centre for Africa Studies, University of the Free State, with an MA and PhD in Romance Philology. He published widely on medieval French literature and on orality. 
 

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