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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 to award honorary doctorate to Maria Ramos

2004-12-08

The Council of the University of the Free State (UFS) recently approved the awarding of an honorary doctorate to Ms Maria Ramos, Group Chief Executive of Transnet in April 2005. A total of five honorary doctorandi will be honored.

The other doctorandi are Proff Jan Groenewald (D Sc (hc)), Jaap Durand (D Phil (hc)), Sampie Terreblanche (C Dom (hc)) and Anthon Heyns (MD (hc)).

Me Ramos will receive an honorary doctorate in Economics (P hD (Economics) (hc)) for the large contribution she made to the establishment of a prudent fiscal and macro-economic policy in South Africa and hence, to the restoration of the financial credibility of the country in the eyes of domestic and foreign investors. Ms Ramos was the Director General of the National Treasury from 1996-2003.

She obtained the MSc-degree in Economics in 1992 from the University of London and was awarded a British Council Scholarship (Helen Suzman award) in the same year and in 1991. During the early nineties she was among others project leader of the ANC’s Macro-economic Research Group and also a member of the team that negotiated chapters on finance in the interim Constitution of South Africa. She was a research associate at the Centre for the Study of the South African Economy and International Finance at the London School of Economics and also lectured at the Universities of South Africa and the Witwatersrand.

“It is a great privilege for us to honor Ms Ramos and the other doctorandi in their different fields of expertise. This once again serves as an example of the UFS’s policy to give recognition to people who excel and make a difference,” said Prof Frederick Fourie, Rector and Vice-Chancellor of the UFS.

Prof Jan Groenewald will receive an honorary doctorate for his life-long commitment to the establishment and development of Agricultural Economics as a subject field in South Africa and in Africa and his various contributions to the UFS. During his career, Prof Groenewald received various awards among others in 1998 when he received the Stals Prize for Economics from the South African Academy for Science and Art and in 1990 when he received an honorary medal from the South African Society for Agricultural Economics.

Prof Jaap Durand will receive an honorary doctorate in Philosophy for his pioneering work on various fields in the South African society. He obtained his Masters degree in Philosophy from the UFS and contributed to almost 60 articles and collections. Prof Durand has a colourful career as academic manager: from professor in Systematic Theology and dean of the Faculty of Theology at the University of the Western Cape to Deputy Vice-Chancellor of the same university. He was the ombudsman of the University of Stellenbosch from 2002-2003.

Prof Sampie Terreblanche will receive an honorary doctorate in Economics for the important role he played, and is still playing, to keep the debate about and the need for socio-economic and socio-political reform in South Africa going. Prof Terreblanche started his career as a lecturer at the UFS. In 1992 the Stals Prize for Economics was awarded to him by the South African Academy for Science and Art. Prof Terreblanche was also a founding member of ASSET, an organisation addressing the problems of poverty, inequality and social injustice in South Africa.

Prof Anthon Heyns, Chief Executive Officer of the South African National Blood Service, will receive an honorary doctorate in Medicine. Prof Heyns is a well-known international researcher in Hematology and recently received a Centenary Medal from the UFS for his strong role and national prominence as expert and leading figure in establishing and developing Hematology at the UFS. He was the first head of the UFS’s Department of Hematology and is also co-editor of the only Afrikaans hand book of Hematology. He serves among others as a council member and member of the executive management of the South African Medical Research Council. On the international front he serves on at least five committees of the World Health Organisation based in Geneve, Switzerland. He has two honorary appointments as professor respectively at the UFS and University of the Witwatersrand.

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

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