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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 academics serve high in ranks of Cereal Science institutions
2017-10-10

Description: Cereal Science Tags: Cereal Science

Dr Angie van Biljon, Senior Lecturer in the Department of Plant Sciences at the University of the Free State (UFS), was elected as president of Cereal Science and Technology South Africa (CST-SA) at their bi-annual general meeting, in Pretoria.

Prof Maryke Labuschagne, Professor in Plant Breeding at the UFS and official representative of South Africa in the American Association for Cereal Chemists International from 2007, was re-elected as the South African representative to the American Association for Cereal Chemists. She attends the annual conference in the US as well as the International Association for Cereal Science and Technology (the European counterpart of AACC) regularly. “I use these conferences to report on the research done by the research team at the UFS on gluten protein, baking quality and nutritional value of cereals,” she said.

Prof. Labuschagne was also involved in a training course for the baking industry. 

Both Dr Van Biljon and Prof Labuschagne are involved in research on wheat gluten proteins, which is critical to the baking industry. CST-SA is a platform to disseminate this and other research, not only locally but also internationally. The aim of this society is to advance cereal science and technology both in the public sector and in the industry of Southern Africa.

CST-SA creates an opportunity for staff and
students working on cereals to interact
with the industry. This prevents research
from being just academic and creates
an opportunity to bring the research and the
industry together.

Wheat research not just academic
According to Prof Labuschagne CST-SA creates an opportunity for staff and students working on cereals to interact with the industry. This prevents research from being just academic and creates an opportunity to bring the research and the industry together. This has been very useful for students at the university working on cereals, as they have made presentations at the “New Voices” symposium, a forum for postgraduate students to present their research.

“Through CST-SA we have also, through the years, presented our research on an international level at the annual meetings of the American Association for Cereal Chemists and the International Association for Cereal Science and Technology,,” said Prof Labuschagne.

The science of cereals
CST-SA is an association of organisations and individuals, from both the private and public sectors, who are actively involved in the science and technology of cereals. Its aim is to promote the dissemination of knowledge and information on cereal science and technology through meetings, publications, workshops and other means. CST-SA also organises training courses for the industry. In the past years there was a course for the baking industry and one for the milling industry and also the “New Voices” symposium”.

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