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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

During 2011: Prestige Scholars Programme (PSP)
2011-12-01

The University has designed the Vice-Chancellor’s Prestige Scholars Programme (PSP) to promote and support the intellectual breadth and depth required of young scholars to pose questions and generate knowledge in their disciplines and hence to occupy the vanguards of contemporary intellectual enquiry. The programme specifically targets members of the academic staff who are near completion, or have newly completed, their doctoral studies.

The goal is to select no more than 100 of the most promising young scholars and to make substantial investments in their development towards becoming full professors. A tailored, intensive programme of support is designated that combines international placement working alongside leading scholars in the discipline of the prestige scholar, with intensive mentorship and support from within the university.

 Description: 2011 PSP_Thuthuka  Tags: 2011 PSP_Thuthuka

Elite young scholars on the Vice-Chancellor’s Prestige Scholars Programme generated R1,2 million in National Research Foundation Thuthuka and Blue Skies funding in 2011 alone. Dr Katinka de Wet in the Department of Sociology was awarded Blue Skies funding for her work on the Hybrid Identity of the HIV/Aids patient. Thuthuka Grant holders Drs Cilliers van den Berg, Olihile Sebolai, Dirk Opperman and Diaan van der Westhuizen work in the fields of German and Afrikaans trauma literature, microbiology, structural and evolutionary biology, and architecture, respectively. This broad disciplinary range typifies the depth and extraordinary range of scholarship present among junior academics at the UFS.


 Description: 2011 PSP_Liza Coetsee Tags: 2011 PSP_Liza Coetsee

Dr Liza Coetsee, a Y2-rated physicist, is the first of the Vice-Chancellor’s elite cohort of Prestige Scholars to submit for National Research Foundation rating. Dr Coetsee works on the latest of the Nanotechnology Surface Science systems housed in our Department of Physics. As Prestige Scholar, Dr Coetsee conducts research on phosphor solar cells. Her aim is to establish a new Phosphor Solar Cell field at the University of the Free State with Proff. Hendrik Swart and Koos Terblans. As a member of the Prestige Scholar Programme, Dr Coetsee will work in collaboration both with colleagues from the Nelson Mandela Metropolitan University and Prof. Eray Aydil from the University of Minnesota and Editor-in-Chief of the Journal of Vacuum Science & Technology.


 Description: 2011 PSP_Olihile Sebolai Tags: 2011 PSP_Olihile Sebolai

Dr Olihile Sebolai is one of the 2 Vice-Chancellor’s elite Prestige Scholars and a microbiologist. In 2011, Dr Sebolai was awarded a Thuthuka Grant for his research on the yeast pathogen Cryptococcus neoformans, the cause of life-threatening Aids-defining illnesses such as meningitis. Dr Sebolai considers how cryptococcal lipids mediate infectious processes leading to illness. An understanding of these cellular processes will offer hope for future drug development to combat the scourge of cryptococcal meningitis, annually causing the death of over half a million people in Sub-Saharan Africa. Dr Sebolai is also interested in mapping the prevalence and distribution pattern of cryptococcal meningitis in the Free State. This, in turn, will assist health authorities to manage current infections and plan appropriately for potential outbreaks. The Prestige Scholars Programme, with the assistance of the National Research Foundation, will afford Dr Sebolai the opportunity to pursue his research in laboratories in the United States and India in 2012 and 2013.


 Description: 2011 PSP_Louis Holtzhausen Tags: 2011 PSP_Louis Holtzhausen

Dr Louis Holtzhausen, member of the Vice-Chancellor’s Prestige Scholars Programme, has been named by the South African Sports Confederation and Olympic Committee (SASCOC) as team doctor for Team South Africa during the All Africa Games, the largest sports event in Africa. National teams from African countries participated in 23 sports events. As an esteemed South African academic in sports medicine Dr Holtzhausens’ participation was an extension of the work already being done under his supervision at the UFS’s Sports Performance Unit. Many of the athletes who prepared at the Unit were also part of the team. Elite athletes’ illness and injury profiles are one of Dr Holtzhausens’ research focus areas. The exposure to this group in competition was of great value in the identification and development of research niche areas.


 Description: 2011 PSP_ Chantel Swart Tags: 2011 PSP_ Chantel Swart

The South African Society for Microbiology awarded Dr Chantel Swart-Pistor, a Prestige Scholar on the Vice-Chancellor’s elite programme, the top prize for her PhD during a recent gala dinner in Cape Town. Dr Swart-Pistor accomplished a breakthrough in the field of nanotechnology with The influence of mitochondrial inhibitors on zoospore and ascospore development. Her supervisor, Prof. Lodewyk Kock and co-supervisors, Dr Carolina Pohl and Prof. Pieter van Wyk, also stressed the important collaboration with Proff. Hendrik Swart (Physics) and Pieter van Wyk (Centre for Microscopy), which made Dr Swart-Pistor’s work possible. She has presented her work in Beijing (Medichem 2011) and Philadelphia (Biotechnology-2011). She has been invited to return to China in 2012.


 Description: 2011 PSP_ Lizette Erasmus Tags: 2011 PSP_ Lizette Erasmus

Dr Lizette Erasmus, scientific chemist and one of the Vice-Chancellor’s Prestige Scholars, has just returned from a three-month-long research visit to Prof. Hans Niemantsverdriet at the Technical University of Eindhoven in The Netherlands and the University of California, Davis. Dr Erasmus specialises in heterogeneous catalysis. Her visit to Prof. Niemantsverdriet, one of the global experts in the field of surface science, served to round of existing research. In California, Dr Erasmus visited her mentor, Prof. Bruce C. Gates, as part of the objectives of the Rector’s programme for the internationalisation of young researchers. Prof. Gates, an expert in catalysis, could contribute to Dr Erasmus’ research on the characterisation of heterogeneous catalysis and catalytic reactions. In exchange, her expertise in organometallic synthesis added value to Prof. Gates’ existing research. Their continued collaboration gave availed them of the opportunity for interdisciplinary interaction between engineering (Prof. Gates’ speciality) and chemistry, and promises to contribute to increased collaboration between the two universities in future.


 Description: 2011 PSP_Dirk Opperman Tags: 2011 PSP_Dirk Opperman

Dr Dirk Opperman, specialist in structural and evolutionary biology and National Research Foundation Thuthuka Grant holder, joined the Vice-Chancellor’s Prestige Scholars Programme after his postdoctoral work at the Max Planck Institute (KOFO) in Germany. Dr Opperman is the recipient of institutional seed funding to establish a protein crystallisation unit, which in turn led to the donation in 2011 of a multi-million Rand X-ray diffractometer¬ from the University of the Western Cape to complement his existing access to international synchrotrons. Dr Opperman is spending part of 2011 at the University of Exeter (UK) to further his research into the three-dimensional structures of specific enzymes and their trajectories of evolution to specific functions.


 Description: 2011 PSP_Abiodun Ogundeji Tags: 2011 PSP_Abiodun Ogundeji

Abiodun Ogundeji is a member of the Vice-Chancellor's Prestige Scholars Programme. Abiodun's work was recently recognised when he and his co-authors received an award for the best contributed paper at the 49th annual conference of the Agricultural Economics Association of South Africa on the topic, Impact of climate change on planning and dealing with flood disasters in South Africa: A case study of Soweto on Sea. The paper was co-authored by Prof. Giel Viljoen from our Department of Agricultural Economics and Herman Booysen, as well as Gawie du T. de Villiers, Research Associates in the Department of Geography. Abiodun is currently conducting invaluable research on the quantification of the economic value of climate change impacts and the benefits and costs of adaptation in South Africa.

 

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