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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

Award-winning architect firm presents the 29th Sophia Gray Memorial Lecture and Exhibition
2017-09-07

  Description: Arch break Tags: Sophia Gray Memorial Lecture and Exhibition, Elphick Proome Architects, South African Institute of Architects

At the Sophia Gray Bursary Fund breakfast, were from the left:
Henry Pretorius, head of the UFS Department of Architecture,
AJ Corbett, and Boipelo Morule, third-year student
in Architecture and Prof Francis Petersen, UFS Rector
and Vice-Chancellor, 
at the UFS
Photo: Stephen Collett

The laureates of this year’s Sophia Gray Memorial Lecture were George Elphick and Nicholas Proome from the award-winning architecture firm, Elphick Proome Architects (EPA). Over the past 28 years this Durban firm has received 26 awards and its work has been published in 26 magazines.  

From bedroom to boardroom
EPA is involved in major corporate architecture as well as several residential projects. It believes that good design is produced from careful study and research combined with sound technical knowledge and artistic judgement. At the 29th Sophia Gray lecture, presented by the Department of Architecture at the University of the Free State, EPA addressed the Bloemfontein community, stating that architecture was about people, space and light. 

For EPA, architecture is the form of art with the most impact on society. “Ultimately, our architecture needs to be enjoyed and be hard to forget,” it said. 

In its three decades of practice, most of EPA’s built work has been executed in South Africa. It has also completed projects beyond South African borders, including Mozambique, Kenya, Ghana, and France. 

The lecture was followed by the opening of the 29th Sophia Gray Memorial Exhibition at Oliewenhuis Art Museum.

New PhD in Architecture with Design announced
A highlight at this year’s lecture was the announcement by Henry Pretorius, the head of the department, of a new and innovative doctoral programme, the PhD in Architecture with Design. From 2018, students with a MArch (professional) or MArch can enrol for this postgraduate qualification.

“The programme recognises the intelligence and ingenuity of design. Its primary objective is to harvest and study the implicit orientations, operations, and achievements of design, and to enlist creativity in the formation of new knowledge. The degree facilitates analytical reflection, stimulates creative action, and opens new insights into the unique logic of design,” said Pretorius.

“Although design-based research has gained international momentum in recent years, similar research has not been done in South Africa until now.”

Contribution to the Sophia Gray Bursary Fund 
During a breakfast function, the department also announced another initiative, the Sophia Gray Bursary Fund. Prof Francis Petersen, Rector and Vice-Chancellor at the UFS, said that the type of architecture in developing countries was different from places such as New York and other big cities in developed countries. For a transformed profession we need architects from different cultures and demographics in the system. The bursary fund was a fantastic starting point for this to happen. 

The Sophia Gray Bursary Fund initiative is part of a greater call to alumni and friends of the department to be actively involved in the department’s continuous development and future endeavours towards imagination, care, and excellence.
AJ Corbett, founder and director of TCN Architects in East London, made the first contribution towards the fund. 

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