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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

Cohesions and Disruptions Forum
2014-07-15

 
The Institute for Reconciliation and Social Justice at the UFS and the Johannes Stegmann Art Gallery, in partnership with the Vryfees, co-presented an artist and academic forum on 18 July 2014.

The forum, ‘Cohesions and Disruptions: Art as a Key to Transformation’, was aptly timed to coincide with Mandela Day. This event formed part of the transformation strategy of the Vryfees arts festival, aiming to support more diversity and cross-cultural, contemporary art programmes.

“Cohesions and Disruptions is part of the new Program for Innovation in Artform Development (PIKO/PIAD),” said Adri Herbert, Director of the Vryfees. “This includes both the cross-cultural OPENLab 2014, a new Australian/South African laboratory for early and mid-career South African artists, and a partnership with the Australian based SituateArt in Festivals initiative, managed by Salamanca Arts Centre in Hobart, Tasmania.”

The forum’s keynote speaker was Lee-Ann Tjunypa Buckskin. She is a Narungga, Wirangu, Wotjobaluk woman from South Australia and Victoria respectively. She is well known throughout the Aboriginal and Torres Strait Islands and broader arts communities. Buckskin’s presentation was titled ‘Building Young Indigenous People’s Lives through Art and Culture in Remote Central Australia.’

Buckskin spoke broadly about her involvement with youngsters – often poverty stricken and sniffing petrol – in remote areas of Australia. She explained how the arts have given the youth a chance at rehabilitation and hope for the future.

After her presentation, she was joined by Dr Willy Nel, lecturer at the UFS School of Education Studies. Dr Nel completed his PhD among the Khomani San in the Kalahari. 

Other forum speakers who presented their work included:
Dr Mari Velonaki, Director of the Centre for Social Robotics at the National Institute for Experimental Art at the University of New South Wales, Sydney;
Dr Nigel Helyer of Sonic Objects; Sonic Architecture, Sydney;
Bec Dean, Curator at Performance Space, Sydney;
Jesse Olivieri, co-founder of Parachutes for Ladies in Sydney; and
Cigdem Aydemir, Vryfees visual artist for 2014.

“Given the histories and present experiences of human rights violations and racial discrimination that indigenous people in Australia and South Africa are subjected to, we are particularly honoured to have Lee-Ann (Buckskin) as a guest speaker,” said Prof Andre Keet, Director of the UFS Institute for Reconciliation and Social Justice. 


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