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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

UFS hosts Fulbright senior specialist
2010-06-14

Pictured from the left, are: Prof. Aldo Stroebel (Director: International Affairs), Prof. Daryl Smith, Ms Dineo Gaofhiwe (Manager: International Research Funding Opportunities, UFS) and Mr John Samuel (Interim Director: the Institute for Studies in Race, Reconciliation and Social Justice, UFS).

The University of the Free State (UFS) has, for the past month, hosted Prof. Daryl Smith, Professor of Education and Psychology at Claremont Graduate University in the United States of America (USA), as a senior Fulbright specialist. She was hosted by the Institute for Studies in Race, Reconciliation and Social Justice, under the leadership of Mr John Samuel, who is its Interim Director. She helped in developing and establishing the research agenda of the institute.

A series of policy briefs and research papers will emanate from Prof. Smith’s tenure at the UFS, complemented by work of three additional Fulbright senior specialists who are joining the UFS early in the second semester. Prof. Smith met with various role-players and stakeholders in the domain of social justice, institutional change, transformation and diversity management, and will continue her association with the UFS at both the Institute and the Faculty of Education, in collaboration with its Dean, Prof. Dennis Francis.

Prof. Smith’s current research, teaching, and publications have been in the areas of diversity in higher education, leadership change, organisational implications of diversity, governance, and assessment and evaluation. She earned her Ph.D. in Social Psychology and Higher Education at Claremont Graduate University, her M.A. from Stanford University, and her B.A. in Mathematics from Cornell University.

Amongst many specialist missions, Prof. Smith served as part of two US delegations to the Ford Foundation-sponsored tri-national conferences (India, South Africa, US) on campus diversity in higher education that have taken place in South Africa and the United States. Her most recent book, Diversity’s Promise for Higher Education: Making it Work, is available from Johns Hopkins University Press.

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