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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

Alcinda Honwana: Youth Protests Main Mechanism against Regime

2015-05-25

Prof Alcinda Honwana

"Enough is Enough!": Youth Protests and Political Change in Africa (speech)

The Centre for Africa Studies at the UFS hosted an interdisciplinary project on the Bloemfontein Campus from 20-22 May 2015.

The project, entitled Contemporary Modes of Othering: Its Perpetuation and Resistance, looked at different perspectives, representations, and art forms of otherness, how it is perceived, and how it is resisted.

The annual Africa Day Memorial Lecture was held on Thursday evening 21 May 2015 at the CR Swart Auditorium. Guest speaker Prof Alcinda Honwana addressed the subject of ‘Youth Protests and Political Change in Africa’.

“Youth now seem able to display what they don’t want, rather than what they do want,” Honwana said in her opening remarks. “Thus, we see the young driven to the streets to protest against regimes.”

Honwana shed some light on recent examples of youth protests in Africa that have enjoyed global attention. Looking at the protests in Tunisia (2010), Egypt (2011), Senegal (2012), and Burkina Faso (2014), it is clear that these events in northern and western Africa have inspired others globally. Yet, Honwana stated that, despite these protests, no social economic change has been seen, and has left dissatisfaction with new governments as well.

“Once regimes fall… young activists find themselves more divided, it seems…

“Which leaves the question: Will street protests remain young people’s main mechanism to avert those in power?”

Background on Prof Alcinda Honwana:

Alcinda Honwana is currently Visiting Professor of Anthropology and International Development at the Open University (UK). She was chair in International Development at the Open University, and taught Anthropology at the University Eduardo Mondlane in Maputo, the University of Cape Town in South Africa, and the New School for Social Research in New York. She was programme director at the Social Science Research Council in New York, and worked for the United Nations Office for Children and Armed Conflict. Honwana has written extensively on the links between political conflict and culture, and on the impact of violent conflict on children and youth, conducting research in Mozambique, the Democratic Republic of the Congo, Angola, Colombia, and Sri Lanka. Her latest work has been on youth and social change in Africa, focusing on Mozambique, Senegal, South Africa, and Tunisia.

Honwana’s latest books include:

• Youth and Revolution in Tunisia (2013);
• Time of Youth: Work, Social Change, and Politics in Africa (2012);
• Child Soldiers in Africa (2006);
• Makers and Breakers: Children and Youth in Postcolonial Africa (2005, co-edited).

Honwana was awarded the prestigious Prince Claus Chair for Development and Equity in the Netherlands in 2007.

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