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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

Thinking stone artist on his way to Italy
2015-04-29

Willem Boshoff

Professor extraordinary at the UFS Department of Fine Art, Willem Boshoff, together with other South African artists, will represent the country next month at the Venice Biennale.

The 56th Biennale takes place between 9 May and 22 November 2015. It is regarded as the world’s most important art event, with 53 countries taking part. This year the artists will take part in the exhibition entitled What remains is Tomorrow, which will take place in the Arsenal complex in the Italian city of Venice, where it will be on view.

Boshoff was responsible for one of the sculptures known as the Thinking Stone, that may be seen in the middle of the Bloemfontein Campus, in front of the Main Building and next to Red Square.

This work consists of a 32-ton black granite block excavated from the Boschpoort stone quarry in Belfast, Mpumalanga. The block has engravings that are copies of the prehistoric rock paintings (also known as petroglyphs) from Driekopseiland (a prehistoric rock art area near Kimberley). Together with the engravings, on the front of the block, there are sand-blasted inscriptions in six languages of verses and well-known quotations that refer to the word “rock”. These inspire further thought and contemplation. Boshoff has created similar works, including Children of the stars, situated at the Cradle of Mankind.

Boshoff is also known for very innovative and conceptual works, and has created various public artworks, both nationally and internationally. His work includes commissions from the University of Johannesburg, The Constitutional Court, the Mpumalanga Legislature in Nelspruit, and South Africa House in London’s Trafalgar Square.

His work focuses regularly on relationships and social interaction. Generally, they are also the subject of subsequent discussions.       

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