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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

UFS forms a strategic partnership with Yale University

2010-03-16

At the official inauguration of the Jonathan Edwards Center Africa was, from the left, front: Prof. Harry Stout, Chair of the Department of American Religious History at Yale University; Prof. Jonathan Jansen, Rector and Vice-Chancellor of the UFS; back: Prof. Dolf Britz, Director of the Jonathan Edwards Center Africa at the UFS; Prof. Kenneth Minkema, Executive Director of the Jonathan Edwards Center at Yale University; Prof. Adriaan Neele of Yale University, now also Professor Extraordinary in the Faculty of Theology at the UFS; and Prof. Francois Tolmie, Dean of the Faculty of Theology at the UFS.
Photo: Stephen Collett

The University of the Free State (UFS) officially inaugurated the Jonathan Edwards Centre Africa in its Faculty of Theology last week. This centre, affiliated with the Jonathan Edwards Centre Yale University in New Haven in the United States of America, was established at the UFS last year.

The strategic partnership between the UFS and Yale University exemplifies the vision of the Faculty of Theology to be an internationally renowned theological and training faculty.

Leading scholars from Yale University, Prof. Harry Stout, Chair of the Department of American Religious History, and Prof. Kenneth Minkema, Executive Director of the Jonathan Edwards Center at Yale participated in the inauguration of the Jonathan Edwards Center Africa.

The Dean of the Faculty of Theology, Prof. Francois Tolmie said, “This visit underscores the strategic relationship between Yale University and the Faculty of Theology and will assist in us continuing to foster high aspiring scholarship, student and faculty support.”

This is an exciting development between universities renowned for excellence in learning, and innovation in scholarship. Prof. Minkema added, “The establishment of this renowned center for research, education and publication, at the UFS is a significant expansion of Edwards scholarship and will serve widely both academia and the church,” Said Prof. Stout.

The Faculty of Theology also announced the appointment of Prof. Adriaan Neele of Yale University as Professor Extraordinary. The appointment follows the vast growth of the Jonathan Edwards Centre Africa. “I welcome this appointment with much anticipation as the strategic relationship between Yale University and the Faculty of Theology develops in unprecedented ways, attracting doctoral students from Southern Africa, South Korea and America,” said Prof. Tolmie.

Jonathan Edwards (1703-1758), pastor, revivalist, Christian philosopher, missionary, and president of Princeton University, is widely regarded as North America’s greatest theologian. He is the subject of intense scholarly interest throughout the world, because of his significance as a historical figure and the profound legacy he left on America’s religious, political and intellectual landscapes.

“The centre and appointment of Prof. Neele will provide sustainable scholarship of primary sources in new and promising ways, said Prof. Dolf Britz, Director of the Jonathan Edwards Africa at the UFS.

“My appointment at this prestige university of Southern Africa is both an honour and humbling. I look forward to a beneficial and academic engagement with students, as well as to serve the academy and the church,” said Prof. Neele.

Prof. Neele’s inaugural address entitled A Transitional Moment in Theology argued for the classicality and catholicity of Edwards’ theology.

The interest in Edwards globally has in part been fuelled by the work of the Jonathan Edwards Centre at Yale University, whose sole mission is to support inquiry into the life, writings, and legacy of Jonathan Edwards by providing resources that encourage critical appraisal of the historical importance and contemporary relevance of America’s premier theologian.

The primary means to achieve this are with the Works of Jonathan Edwards Online, a digital learning environment for research, education and publication that presents all of Edwards’s writings, along with helpful editorial materials that allow the reader to examine Edwards's thought in incredibly powerful, useful ways.

Media Release
Issued by: Lacea Loader
Director: Strategic Communication (actg)
Tel: 051 401 2584
Cell: 083 645 2454
E-mail: loaderl@ufs.ac.za
15 March 2010

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