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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

Free State Receives R7 Million Grant from the Mellon Foundation for Arts Innovation

2015-11-30

Man in the Green Blanket, Lesiba Mabitsela.
Photo: Karla Benade

Bloemfontein will experience a flood of new, experimental art over the next four years as a result of R7 million that has been received to develop experimental art projects in central South Africa. The Andrew W. Mellon Foundation recently awarded the grant to the University of the Free State (UFS) for the Programme for Innovation in Artform Development (PIAD). Initiated jointly by the UFS and the Vrystaat Arts Festival in 2014, PIAD was established as a programme to promote the exploration of the arts to advance interdisciplinary research and to impact on human development.

The Andrew W. Mellon Foundation is a New York-based, non-profit organisation which endeavours to strengthen, promote, and, where necessary, defend the contributions of the humanities and the arts to human flourishing, and to the well-being of diverse and democratic societies.

“The Innovation in Artform Development initiative will provide an important contribution to the ways in which the university hopes to broaden and deepen research and dialogue about the humanities in South African society. Using the arts as a vehicle to engage communities around issues of social significance, makes for an exciting endeavour, and we are happy to have Mellon’s financial and partnership investment in this initiative,” said Prof Jonathan Jansen, Vice-Chancellor of the UFS.

“This substantial support from the Foundation will play a pivotal role in facilitating collaborations with national and international artists to explore new, innovative modes of artistic practice and creative production in South Africa,” said Angela de Jesus, UFS Art Curator and Co-Director of PIAD.

“A series of First Nations projects, arts/science research and artist residencies, arts laboratories for creative practitioners, the production of exciting new work for Bloemfontein, and critical debates/forums is expected over the next few years,” she added.

PIAD focuses on supporting cross-cultural, experimental art programmes that can assist South African society creatively. For this process, PIAD is engaging the skills and expertise of South Africa artists in collaboration with several international partners, who are recognised as global leaders in this field, to develop a mutually- beneficial programme of engagement.

Innovation, technology, and new forms of art will be explored and international collaborations that have the potential to attract benefits for the creative industries in Bloemfontein and beyond will be introduced.

“The artistic landscape of the Free State - in fact the whole South Africa - will be forever changed because of this extraordinarily generous grant. Rarely does a regional community get a chance to lead innovation on a national scale, and also impact on experimental art internationally. We are in for an incredible artistic journey,” said Dr Ricardo Peach, Director of the Vrystaat Arts Festival and Co-Director of PIAD.

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