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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

Enhancement of social justice focus at research colloquium

2010-10-07

At the third Education for Social Justice Research Colloquium the publication Praxis towards sustainable empowering learning environments in South were handed to Prof. Ezekiel Moraka, Vice-Rector: External Relations at the UFS. At this occasion were, from the left: Prof. Dennis Francis, Dean of the UFS Faculty of Education; Prof. Sechaba Mahlomaholo, Research Professor in the Faculty of Education Sciences at the North-West University; Prof. Moraka; and Dr Milton Nkoane, Senior Lecturer in the UFS Faculty of Education.
Photo: Leonie Bolleurs

This year, the University of the Free State (UFS) was the host for the Research Colloquium: Education for Social Justice for the very first time. It is the third time that this colloquium has been presented.

Prof. Ezekiel Moraka, Vice-Rector: External Relations at the UFS, opened the colloquium, stating that academics, through their research, are ultimately in a good standing to advise government on important issues such as social justice for them to address these issues accordingly.

Prof. Sechaba Mahlomaholo, Research Professor in the Faculty of Education Sciences at the North-West University, delivered the opening address on the theme: Validating community cultural wealth towards sustainable empowering learning environments for social justice. He said that the legacy of our recent past as South Africa still continues to haunt us, especially as exemplified in the dysfunctionalities that are rife in our education.

“With the colloquium we manage to bring together the ideas, thoughts, resources and efforts of educators and/or educationists concerned with the creation of a more equitable, equal, free, hopeful, peaceful and socially just society. Through our teaching, our community engagement and research activities we strive towards a more humane, caring, respecting and respectful South Africa and the world,” he said.

According to Prof. Mahlomaholo, education and its research are some of the most potent mechanisms at the very centre of social transformation. The papers at the colloquium focused on investigating, understanding and responding to issues of amongst others:

The medium of teaching and learning which continues to be a barrier to many learners to perform to the best of their abilities in the majority of the education institutions in South Africa;
Health, sexuality, HIV/Aids, stigmatisation and other deseases plaguing our communities currently;
Self-fulfilling prophecies and stereotypes about some learners not being as intelligent as the rest and this finally being reflected and confirmed in their poor academic achievements;
Differentiated levels of parental involvement in the activities of their children’s learning due to long absences from their families as they have to work in far-off places of employment;

Papers delivered at the colloquium moved beyond merely identifying the problems; they also suggested possible and plausible research-based solutions to these, such as integrating HIV/Aids education in curricula, listening to the aspirations of significant stakeholders such as mothers and parents generally in teaching and facilitating more rigorous community engagement practices.

At the colloquium gala dinner the book Praxis towards sustainable empowering learning environments in South Africa by authors Dr Milton Nkoane, Senior Lecturer in the UFS Faculty of Education, Prof. Mahlomaholo and Prof. Dennis Francis, Dean of the Faculty of Education at the UFS, was launched. The publication consists of a collection of the best peer-reviewed papers from a conference with the theme Creating sustainable empowering learning environments through scholarship of engagement. The main criterion for inclusion was that the paper should contribute to the theme by means of an original, tight, theoretical and empirical study conducted with the aim of informing the practice of creating sustainable empowering learning environments. The concrete cases examined in many of the chapters are very useful to helping readers understand the specific, on-the-ground concerns related to higher education and schools.

Media Release
Issued by: Leonie Bolleurs
Strategic Communication
Tel: 051 401 2707
Sel: 0836455853
Email: bolleursl@ufs.ac.za
30 September 2010

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