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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

Zubeida Jaffer short film to feature on SABC3

2014-10-08

Zubeida Jaffer
Photos: Adrian Steirn, 21 Icons South Africa

The nation-building initiative known as 21 ICONS South Africa, was recently thrilled to announce that Zubeida Jaffer will feature in their second season due to her professional excellence as a journalist and author.

Jaffer is a well-known South African reporter and author and has been a writer-in-residence at the UFS for three years now. The 21 ICONS project was inspired by Nelson Mandela and has created a movement for positive change. By sharing the stories of iconic South African men and women, the intention is to inspire new generations to follow in their footsteps.

One icon is featured per week in a visual celebration of engaging and entertaining portraits and short films, along with an essay biography across multiple media platforms such as print, broadcast, outdoor and social media. Jaffer’s short film will be broadcasted on 2 November 2014 at 20:27 on SABC3 and her collectable portrait will be published in City Press on the same day.

Jaffer’s short film discusses her truth as a journalist and activist who was a key figure in the struggle movement in the Western Cape during apartheid. In an intimate conversation with Adrian Steirn (creator, photographer and director of 21 ICONS, Jaffer talks about her journey as a journalist who always seeks to uncover the truth and give people who don’t have a voice an outlet to express their views, opinions and thoughts.

Other iconic South Africans that have featured on 21 ICONS, were among others, Francois Pienaar (former Springbok rugby captain who won the 1995 Rugby World Cup), Pieter-Dirk Uys (satirist who used comedy and caricature to oppose the apartheid government) and Frene Ginwala (the first female speaker in the National Assembly of South Africa).

With the country celebrating 20 years of democracy, the message that everyone can do something to make a difference – which is portrayed in these powerful and inspiring stories that make up the second season of 21 ICONS – has been well-received by South Africans.

Be sure to get your City Press early and tune in on the evening of 2 November 2014 to see Jaffer’s feature on 21 ICONS.

Jaffer is also the publisher of the Journalist website (http://www.thejournalist.org.za/) launched earlier in 2014, of which the UFS is the founding member. The Journalist is “an independent, non-profit organisation working with the academic community and a range of credible online entities to make their knowledge more accessible to the wider public.”

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