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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

Education dialogue opens engagement on legacy of OR Tambo

2017-10-05

Pali Lehohla, outgoing Statistician-General speaking at the
Centennial celebration of Oliver Tambo.
Photo: Supplied

To celebrate Oliver Reginald Tambo’s centennial year, the Oliver and Adelaide Tambo Foundation, in partnership with the Rector and Vice-Chancellor of the University of the Free State (UFS), Prof Francis Petersen, and Absa Bank, hosted an interactive dialogue session, titled “Educating Africa’s Future” on 26 September 2017 on the Bloemfontein Campus.

Students encouraged to take charge of their future
The event opened up dialogue on some of the current burning issues that affect students in South Africa, societal challenges such as poverty and crime, and how leaders such as Tambo envisaged a free Africa. Prof Petersen highlighted the role that universities played in developing society, in creating leaders and crafting the path to transformation. Other speakers included Pali Lehohla, outgoing Statistician-General, Linda Vilakazi, CEO of the Oliver and Adelaide Tambo Foundation, Nombulelo Nxesi, CEO of Education, Training and Development Practices, Sector Education and Training Authority, Prof Peliwe Lolwana, Associate Professor at Wits University’s Centre for Researching Education and Labour, and Sikhululekile Luwaca, former UFS Student Representative Council (SRC) president.

Education may require a new approach
During the panel discussion that was facilitated by Phiwe Mathe, former UFS SRC President and media officer in the Office of the Chief Whip of the Free State Legislature. The audience raised concerns regarding the future of funding for university study, the securing of employment and possibilities, if any, of entrepreneurship. In response to some of the concerns, Pali Lehohla said the realities of family dynamics in South Africa affected the ability of students to be properly profiled and funded, according to family income, and that most importantly, the solutions to Africa’s challenges had to come from within and not without. Students’ questions gravitated towards the question of whether higher education in its current form was still valuable or whether new models of teaching that would foster inclusion and earlier economic independence would be of better value.

The legacy of OR Tambo continues to be honoured
The notion of education as a driver for the liberation of South Africa and the continent as a whole, poverty alleviation and freedom from colonial rule are some of the building blocks of the legacy of Oliver Tambo.
Linda Vilakazi reiterated that students and student leaders would benefit from seeing the importance of using a broad-based African approach to the issues that plague them and their peers, rather than seeing their challenges outside of the continental context. Sikhululekile Luwaca said higher education must be more accessible, and in order to drive change, students should use their education to become future employers rather than employees and change the face of the future themselves as was envisioned by other liberation leaders.
Caption: Pali Lehohla, outgoing Statistician-General speaking at the Centennial celebration of Oliver Tambo.

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