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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

Learning to serve, serving to learn

2013-10-18

At the Community Engagement Open Day were, at the back, from the left: Dr Choice Makhetha, Vice-Rector: External Relations; and Rev Billyboy Ramahlele, Director of Community Engagement. In front are, from the left: Selby Lengoabala, Betlehem Unit Manager; Councillor Job Tshabalala, Acting Executive Mayor; and Councillor Isaac Tshabalala, Strategic Manager in the office of the Executive Mayor of the Dihlabeng Local Municipality.
18 October 2013

Local community members, students and staff gathered at the Bloemfontein Campus, displaying what they do to empower communities.

The university held its first Community Engagement Open Day in order to honour outstanding individuals and highlight programmes that advance its civil responsibility. Hosted by the UFS Community Engagement Directorate, local community members, students and staff gathered in the Callie Human Centre at the Bloemfontein Campus, displaying what they do to empower communities.

Partners in Community Engagement (CE) and Service Learning (SL), local government, community-based research, student volunteer groups, Non-Profit Organisations (NPOs) and private business interacted with guests at their various information stalls. Faculties and departments displayed their distinctive programmes and demonstrated a renewed commitment to change lives through sharing knowledge, rendering services and fostering empowerment among communities.

In recognition of outstanding service, commitment and excellence in the field of community engagement and service learning, some staff members, researchers and some partners received the Vice-Rector’s Award for Community Engagement. Among them was Prof Matie Hoffman, who was honoured for his longstanding involvement in research at the Boyden Observatory. He is currently at the forefront of renovations for the planetarium at Naval Hill. In the category for external partners, REACH and Heidedal Childcare were awarded for demonstrating commitment towards their partnership with the university. The acting Executive Mayor, Job Tshabalala, also received an award on behalf of Dihlabeng Local Municipality Mayor, Tjhetane Mofokeng, for their involvement in education and social cohesion programmes. During his keynote address, the Director of Community Engagement, Rev Billyboy Ramahlele, emphasised the contribution that community engagement has on the two major strategic programmes of the university, namely the Academic and Human Projects. He pointed out that CE creates a platform on which students learn to appreciate human diversity in a real and unprotected set-up.

The interactions of the Open Day are expected to raise awareness, cultivate understanding among partners, encourage solid alliances and bring to the fore an acknowledgement of community engagement as the integral part of higher education.

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