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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

Weak states and armed movements – researching the underlying links
2014-08-28

 

Prof Theo Neethling is conducting research on armed movements in the DRC.
Photo: en.wikipedia.org

Prof Theo Neethling from the Department of Political Studies and Governance is currently conducting research on armed movements in the Democratic Republic of the Congo (DRC).

“My research is premised on the scholarly insight and argument that in weak states, such as the DRC, armed movements and militias are filling power vacuums that are the result of the inability and lack of military capacity to fight these movements effectively,” Prof Neethling says.

“In this context, the DRC is severely affected by sub-state terrorism,” he continues.

“This is a phenomenon that is intimately linked to the failure to effect sustained development and to consolidate accountable and effective governance in especially the eastern provinces of the country.”

Earlier this year, Prof Neethling presented conference papers on this topic at two international conferences: the Conference of the New York State Political Science Association, as well as the World International Studies Conference hosted in Frankfurt, Germany.

In 2013, Prof Neethling co-edited the book, ‘Post-Conflict Reconstruction and Development in Africa: Concepts, Policy, Role-players and Practice’. He completed this work in collaboration with Prof Heidi Hudson from the UFS Centre for Africa Studies.

“The book revolves around the concept of ‘post-conflict’ and the blurring of military and civilian roles, analysing the multiple roles of the United Nations in the DRC and Sierra Leone, as well as the African Union Mission in Burundi,” Prof Neethling says.

“It also explores South Africa’s foreign policy imperatives in relation to multinational peace missions in conflict-stricken African states, involving military as well as civilian role-players.” 
 
 
 
 
 

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