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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

Two honorary doctorates part of highlights at UFS graduations

2017-11-30

Leah Molatseli (left), Dr Imtiaz Sooliman, and Likeleli Monyamane will be
the guest speakers during the End-of-year Graduation Ceremonies
at the University of the Free State.
Photos: Supplied, www.mudboots.co.za

Roads and entrance closed due to roadworks on the Bloemfontein Campus

Graduation Livestream

Two honorary doctorates and a Chancellor’s medal will be some of the highlights during the End-of-year Graduation Ceremonies at the University of the Free State (UFS).

The Callie Human Centre on the Bloemfontein Campus will once again welcome graduates, their parents, friends, and relatives for the celebrations on 6 and 7 December 2017. A total number of 1226 qualifications, including diplomas, certificates, and degrees, will be conferred during the two days.

Altogether 40 doctorates and 109 master’s degrees will be awarded. Most doctorates (19) will be awarded in the Faculty of Natural and Agricultural Sciences, while most of the master’s degrees (27) are in the same faculty.

Prof Holloway, Botha, and Isaacs honoured
Prof Paul Holloway (Natural and Agricultural Sciences) and Marius Botha (Law) will receive honorary doctorates during the afternoon ceremony on 7 December 2017, while Joyene Isaacs (Natural and Agricultural Sciences) will be honoured with a Chancellor’s Medal.

Prof Holloway is an internationally acclaimed expert in the science and technology of surfaces, thin films, and nanoparticles, and Botha has played a significant role in financial planning in South Africa. Isaacs is the Head of Department of the Western Cape Department of Agriculture, and her department has been nominated by the South African Institute of Government Auditors as the best government department.

Young leader, young alumnus, and humanitarian
Likeleli Monyamane, Leah Molatseli, and Dr Imtiaz Sooliman will be the guest speakers at the ceremonies.

Monyamane, a UFS Council member, will address graduates on 6 December 2017 during the morning ceremony. She is one of 15 young leaders selected to represent Lesotho as participants in the Mandela Washington Fellowship in the United States. In 2016, Molatseli, the speaker during the afternoon session on 6 December 2017, launched South Africa’s first legal ecommerce website, Lenoma Legal, and is the university’s most recent Young Alumnus of the Year.

Dr Sooliman, the speaker at both ceremonies on 7 December 2017, is the founder and Director of the Gift of the Givers Foundation. He has received more than 100 national and international awards, citations, commendations, and special recognition for his humanitarian work.

Date: 6 December 2017
Time: 09:00: All qualifications up to Honours degrees in the Faculty of Economic and Management Sciences (including the Business School) and the Faculty of Natural and Agricultural Sciences
14:30: All qualifications up to Honours degrees in the Faculties of Education, Law, the Humanities, and Theology

Date: 7 December 2017
Time: 09:00: All qualifications up to Honours degrees in the Faculty of Health Sciences and Educational qualifications in Open Distance Learning – South Campus
14:30: Master’s and Doctoral degrees in all faculties

For information about the ceremonies, click here to visit the graduation home page.

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