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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

UFS changes format of graduation ceremony

2011-04-17

The highest number of qualifications in the history of the University of the Free State (UFS) will be awarded at the autumn diploma and graduation ceremony from 9-11 May 2011, which will be held in the Callie Human Centre on our Main Campus in Bloemfontein.

From this year, the format of the ceremony will change to make it more visible to students and the public. For the first time, all the doctoral and master’s degrees from each respective faculty will be conferred during one ceremony on 11 May 2011, instead of each faculty handling these qualifications individually. Another change in the format is that the procession will gather on the Red Square in front of the Main Building and move to the Callie Human Centre from there. Both academic staff and graduands will partake in the procession.

A total of 3 674 qualifications will be conferred during this year’s graduation ceremony, including 629 diplomas, 2 613 Bachelors and honours degrees, 372 master’s degrees and 58 doctorates.

An honorary doctorate in Drama and Theatre Arts will also be awarded to theatre stalwart Mr Pieter Fourie. He is one of the most acclaimed Afrikaans playwrights in South Africa and probably the only person to have left his mark as an actor, director, artistic director and writer.

Mr Fourie was awarded the Gerhard Beukes prize for drama , was honoured for his contribution to the arts by the South African Academy for Science and Arts and was appointed as trustee of the Arts and Culture Trust of the State President in 1997. He has also served as a committee member of the South African Academy for Science and Arts.

Mr. Fourie has also been the proud recipient of the Hertzog prize for drama, two FNB-Vita awards and a Fleur Du Cap award.

The full programme for the respective ceremonies is as follows:

Monday, 9 May 2011:

At 08:30, certificates and diplomas, excluding PGED and PGES, will be awarded to graduates from the Faculty of Education and at 12:00 PGED, PGED and B and honours degrees will be awarded to students from the same faculty. At 15:30 on the same day, certificates and B and honours degrees will be awarded to students in the Faculty of the Humanities.

At 19:00, the Faculties of Education, the Humanities and Economic and Management Sciences will have their prize-giving ceremonies for outstanding achievers.

Tuesday, 10 May 2011:

At 08:30, students in the Faculty of Economic and Management Sciences will graduate and at and 12:00 the Faculty of Natural and Agricultural Science will join them. This includes students in BML, B.Admin., B.Pub. and related honours degrees. At 15:30, 503 students from the Faculty of Natural and Agricultural Sciences will receive their certificates, diplomas and B and honours degrees.

At 19:00, the Faculties of Health Sciences, Natural and Agriculture Sciences, Law and Theology will have their prize-giving ceremonies.

Wednesday, 11 May 2011:

The Faculty of Health Sciences, the Faculty of Law and the Faculty of Theology will be awarding their certificates, diplomas and B and honours degrees at 08:30. At 12:00, all faculties will award a total of 372 master’s degrees and at 15:30 a total of 58 doctorates will be conferred.

The Chancellor’s Dinner will take place in the Centenary Complex on the Main Campus of the UFS at 19:00.

The graduation ceremony of our Qwaqwa Campus will take place in the Rolihlahla Mandela Hall on the Qwaqwa Campus on 7 May 2011 at 10:00. All the faculties at this campus will confer their degrees, certificates and diplomas at this ceremony.

Media Release
21 April 2011
Issued by: Lacea Loader
Director: Strategic Communication
Tel: 051 401 2584
Cell: 083 645 2454
E-mail: news@ufs.ac.za

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