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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

Record number of students to graduate at UFS

2017-06-19

Description: Day 2 Mid-year Graduation Bloemfontein Campus Tags: Day 2 Mid-year Graduation Bloemfontein Campus

Eleven graduation ceremonies will form part of the
mid-year graduation ceremonies at the
University of the Free State.
Photo: Charl Devenish

Livestream of Graduation Ceremonies

Six days, eleven ceremonies, and more than 5 000 degrees. This all forms part of what is the biggest set of graduation ceremonies in the history of the University of the Free State (UFS).

The mid-year graduation ceremonies, taking place from 19 to 26 June 2017 in the Callie Human Centre on the Bloemfontein Campus, will see the most students graduate during a week. A total of 5 258 degrees, which includes 460 master’s and doctoral degrees, will be conferred – including 72 doctoral degrees.

First graduation ceremonies for Prof Petersen
It will also be the first ceremonies that Prof Francis Petersen, new Rector and Vice-Chancellor, attends on the Bloemfontein Campus. Students from all seven faculties, as well as the South Campus, will graduate.

Graduates per faculty are (without master’s and doctoral degrees): Faculty of Education (488), Faculty of Health Sciences (345), Faculty of Theology (29), Faculty of Law (686), Faculty of Natural and Agricultural Sciences (1 029), Faculty of Economic and Management Sciences (1 044), Faculty of the Humanities (826), and the South Campus (354).

Guest speakers include three judges
Guest speakers for the ceremonies include Dipiloane Phutsisi, Principal and Chief Executive Officer of the Motheo TVET College in the Free State, Dr Susan Vosloo, UFS Council member and founder member of the World Society for Paediatric and Congenital Heart Surgery, and Prof Petersen.

Three judges will also act as speakers. They are Justice Ian van der Merwe, Judge of Appeal at the Supreme Court of Appeal and former Chair of the UFS Council, Justice Mahube Molemela, Judge President of the Free State Division of the High Court and Acting Justice of the Supreme Court of South Africa, and Justice Connie Mocumie, Judge of Appeal at the Supreme Court of Appeal.

Graduations ceremonies:

19 June 2017:
09:00: Faculty of Education, except educational qualifications in Open Distance Learning – South Campus
14:30: Faculty of Health Sciences, Faculty of Theology and Faculty of Law (including the School of Financial Planning Law)

20 June 2017:
09:00: Faculty of Natural and Agricultural Sciences: All Bachelor’s degrees
14:30: Faculty of Natural and Agricultural Sciences: All Diplomas and Bachelor Honours degrees

21 June 2017:
09:00: Faculty of Economic and Management Sciences: All Certificates, Diplomas, Bachelor’s degrees and Bachelor Honours degrees, excluding BCom degrees
14:30: Faculty of the Humanities: Social Sciences and Communication Sciences only

22 June 2017:
09:00: Faculty of Economic and Management Sciences: BCom degrees only
14:30: Faculty of the Humanities: All qualifications except Social Sciences and Communication Sciences

23 June 2017:
14:30: Educational qualifications in Open Distance Learning – South Campus

26 June 2017:
09:00: All faculties except the Faculty of Natural and Agricultural Sciences: Master’s and Doctoral degrees
14:30: Faculty of Natural and Agricultural Sciences: Master’s and Doctoral degrees

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