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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 honours many during Autumn Diploma and Graduation Ceremony

2006-04-06

The University of the Free State (UFS) will award 857 diplomas and 2 579 degrees on 21 April 2006 and from 24-26 April 2006 during this year’s autumn diploma and graduation ceremony. Students from the Main Campus and Vista Campus will take part in the ceremony.

Altogether 35 doctorates and two honorary doctorates will be awarded. The honorary doctorandi are Mr Pieter Cox (Ph D (hc)) and Mr Terry Moss (Ph D (hc)). Mr Cox is the non-executive chairperson of Sasol Limited and Mr Moss is General Manager: Generation Business Enhancement at Eskom.

On 21 April 2006 at 08:30 altogether 347 diplomas in all the faculties (except the upgrading programmes in the School of Education) will be awarded. On the same day at 14:30 altogether 361 degrees in the Faculty of Economic and Management Sciences (excluding B Acc, B Admin, B Pub and related honours, master’s and doctor’s degrees) will be awarded.

On 24 April 2006 at 08:30 altogether 510 diplomas will be awarded in the School of Education (ACE, NPDE and CE). That same day at 14:30 altogether 314 degrees, one doctorate and one honorary doctorate will be awarded in the Faculty of Economic and Management Sciences (i.e. B Acc, B Admin, B Pub and related honours, master’s and doctor’s degrees). The honorary doctorate will be awarded to Mr Pieter Cox during this ceremony.

Mr Cox will be honoured for being the driving force behind Sasol’s global expansion and the subsequent listing of Sasol on the New York Stock Exchange. His passion and focus ensure that Sasol as a national asset is constantly making history, despite the sometimes hostile economic and environmental influences.

On 25 April at 08:30 altogether 325 degrees and 9 doctorates will be awarded in the faculties of Health Sciences, Law and Theology. That same day at 14:30 altogether 554 degrees, 13 doctorates and one honorary doctorate will be awarded in the Faculty of Natural and Agricultural Sciences. The honorary doctorate will be awarded to Mr Terry Moss during this ceremony.

Mr Moss is regarded as a modern-day South African industrialist. He will be honoured for his dedication to the provision of sustainable renewable energy to the citizens of South Africa and Southern Africa through the development and promotion of the hydroelectric power industry and other sources of renewable electrical energy.

On 26 April at 08:30 altogether 427 degrees and 5 doctorates will be awarded in the Faculty of the Humanities and that same afternoon at 14:30 altogether 598 degrees and 7 doctorates will be awarded in the School of Education.

Both the diploma and degree ceremonies will be held in the Callie Human Centre on the Main Campus in Bloemfontein.

Media release
Issued by: Lacea Loader
Media Representative
Tel: (051) 401-2584
Cell: 083 645 2454
E-mail: loaderl.stg@mail.uovs.ac.za
5 April 2006

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