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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

PSP produces first Y1-rating in UFS Faculty of Economic and Management Sciences
2015-12-14

Dr Andrew Cohen, a research fellow at the University of the Free State, recently received a distinguished National Research Foundation Y1-rating.
Photo: Sonia Small

The latest success story of the Vice-Chancellor’s Prestige Scholars Programme (PSP) is that the first National Research Foundation (NRF) Y1-rating was awarded recently to a scholar while teaching in the Faculty of Economic and Management Sciences at the University of the Free State (UFS).

Dr Andrew Cohen received this distinguished rating on 10 November 2015. It is awarded to a “young” (younger than 40) scholar five years or less post-PhD, whose curriculum vitae predicts, according to a panel of international and local reviewers, that he is poised to become a leader in his field. Dr Cohen is a research fellow at the UFS.

This rating is a reflection of Dr Cohen’s record over the past eight years, and the scholarly environment he was part of at the UFS under leadership of Prof Ian Phimister. Cohen is currently a research fellow in Prof Phimister’s International Studies Group.  He taught economic history in the Department of Economics until September 2015, when he joined the School of History at the University of Kent.

Dr Cohen’s professional trajectory is emblematic of the visionary approach of the UFS Prestige Scholars Programme (PSP): to support prestige scholars with advanced mentorship, and the creation of a college of peers in order to nurture intellectual breadth and depth to generate knowledge over disciplines.

The PSP was initiated by Prof Jonathan Jansen, Vice-Chancellor and Rector of the UFS in 2011.

“Jonathan Jansen’s prestige scholars have become sought after in the academic community at large, as this recent appointment at the University of Kent indicates,” says Professor Neil Roos, co-director of the PSP. “Yet the alumni’s commitment to the programme, the university and their peers continues.”

Cohen is the editor (with Casper Andersen) of the five volume, The Government and Administration of Africa, 1880-1939. Dr Cohen’s next project is forthcoming from I.B. Tauris, The Politics and Economics of Decolonisation: The Failed Experiment of the Central African Federation.

 

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