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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

A time to celebrate: Autumn graduations

2016-04-07

General graduation information
Livestreaming

The first series of graduations for the year are upon us. Graduates from all seven faculties, the Business School, and the School of Open Learning at the University of the Free State (UFS) will be celebrating their academic achievements. A total of 3681 qualifications will be conferred at ceremonies on the Bloemfontein Campus from 12 to 15 April 2016.

Sejakhumo Makhetha, daughter of our Vice-Rector: Student Affairs and External Relations, Dr Choice Makhetha, will be among the graduates receiving BA Governance and Political Transformation degrees. Coincidently, Dr Makhetha obtained her PhD in Political Science in 2003 at the UFS. Sejakhumo Makhetha is currently busy with her postgraduate diploma in the same field.

The four-day celebration symbolises the UFS prerogative as an institution to transform lives by producing leaders of tomorrow. Dr Muavia Gallie, Dr Sello Hatang, Dawie Roodt, and Nikiwe Bikitsha are expected to address these future leaders and guests at these ceremonies.

Addressed by the best

On the guest speaker line-up, we have Dr Gallie, a School and District Turnaround Strategist and education activist, who has been identified as one of the 10 Most Impressive Public Leaders for 2015 by the UFS Vice-Chancellor and Rector, Prof Jonathan Jansen. The former Head of Operations, Human Resources and Information and Communication Technology at the South African Council for Educators (SACE) has had more than 30 years of experience in education.

Dr Gallie and Dr Hatang will address graduates of the Faculties of Education, Health Sciences, Law, and Theology on 12 April 2016. Dr Hatang is the Chief Executive of the Nelson Mandela Foundation. In addition to being a founding member of the Advisory Council of the Council for the Advancement of the South African Constitution, Hatang has had the privilege of serving as the Head of Information Communications, and spokesperson for the South African Human Rights Commission as well as Director: South African History Archive at Wits University.

Dawie Roodt, founder, director, and chief economist of the Efficient Group, will speak at the Faculty of Economic and Management Science ceremony on 14 April 2016. This nationally-renowned economist boasts 30 years of experience in monetary and fiscal policy, and is one of the most referenced authors. In 2013, he published Tax, Lies and Red Tape.

As one of South Africa’s leading journalists, Nikiwe Bikitsha will draw on her 20-year career in radio, television, and journalism to address the Faculty of the Humanities graduates on the final day of graduations. Through her passion for Africa’s economic development and women empowerment, the co-founder and CEO of Amargi Media has been a successful Programme Director for UN, IMF and AU-related events.

Details of event

Dates: 12, 13, 14, 15 April 2016

Times: 09:00 and 14:30

Venue: Callie Human Centre, Bloemfontein Campus, University of the Free State

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