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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

Food insecurity at university campuses a growing threat
2015-07-28

Food insecurity on university campuses in South Africa has come to the fore as one of the more pressing subjects that needs to be tackled to ensure the continuing education of disadvantaged students across the country.

On Friday 14 August 2015, the University of the Free State will host the first higher education colloquium on food insecurity on university campuses.  The one-day colloquium will take place during the Arts and Social Justice Week, in collaboration with the UFS’s Institute for Reconciliation and Social Justice Best practices will be shared, exploring the available research on student food insecurity at institutions of higher education.

Food insecurity has emerged as a pressing social justice issue affecting students countrywide. Action needs to be taken to promote the academic success of students, who will ultimately contribute to the country’s economic growth. One of the primary focus areas of the colloquium will be to establish a common practice to address this need.  Universities leaders, staff from wellness and social work departments, and SRC members from across the country who have been invited, and are expected to attend, are the University of Pretoria, the Tshwane University of Technology, North West University, UNISA, and the Central University of Technology.

Professor Jonathan Jansen will participate in a panel discussion alongside Ruda Landman and Prof Edelweiss Wentzel-Viljoen (HPCSA). This promises to be an inspiring meaningful dialogue, by asking the difficult question:  How do we change the food insecurity situation at universities?

The University of the Free State is currently the country’s leading university in addressing food insecurity on all its campuses through its flagship No Student Hungry Bursary programme, which has funded more than 500 students since it was established in 2011.

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