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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 awards honorary doctorates during spring graduation ceremony

2004-09-20

The University of the Free State (UFS) will award three honorary doctorates this week during its spring graduation ceremony.

The graduation ceremony will take place on Wednesday 22 September 2004 and the honorary doctorates are Dr Calvin Seerveld (D Phil (hc), Prof YK Seedat (MD (hc) and Dr Mary Seely (D Sc (hc).

“The doctorates come from a wide spectrum of specialty fields and serve as proof of the UFS’s policy to give recognition to people who stand out and make a difference,” says Prof Frederick Fourie, Rector and Vice-Chancellor of the UFS.

Dr Calvin Seerveld (D Phil (hc) will receive an honorary doctorate for his academic leadership at the Institute for Christian Studies in Toronto and the wide international recognition he has received throughout his career in various subject areas, eg philosophical aesthesia, the theory of art, the methodology of the description of the history of art and continental philosophy.

Prof YK Seedat (MD (hc) will receive an honorary doctorate for his extraordinary contribution to medicine in South Africa. His research in the field of hypertension in blacks received international recognition and significantly contributed to the understanding of the pathophysiology of this condition.

In the mid-eighties Prof Seedat was instrumental in supporting the bid from the Faculty of Medicine at the University of the Orange Free State (UOFS) to host the first Colleges of Medicine of South Africa examination in Bloemfontein. This started a tradition that is still being maintained. Prof Seedat is a researcher at the Faculty of Health Sciences at the University of Kwa-Zulu Natal.

The Executive Director of the Desert Research Foundation of Namibia, Dr Mary Seely (D Sc (hc)), will be honored for the impact she has made on the development of environmental management in the drier parts of the southern African subcontinent. Though her research has been concentrated in Namibia, she has affected the professional lives of large numbers of ecologists, environmental scientists and environmental managers.

According to Prof Fourie the three doctorates form part of the greater group of 18 who will be honored by the UFS during its centenary year. The last group will be receiving their honorary doctorates in October 2004.

Media release
Issued by: Lacea Loader
Media Representative
Tel: (051) 401-2584
Cell: 083 645 2454
E-mail: loaderl.stg@mail.uovs.ac.za
20 September 2004

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