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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

Greyhound racing: Public input needed

2009-02-03

Members of the public have a second opportunity to make submissions regarding the possible legalisation of greyhound racing in South Africa.

A research team from the Faculty of Law at the University of the Free State (UFS), in conjunction with the Department of Trade and Industry (dti), will hold a second round of public consultations in Gauteng, the Free State, North West, the Eastern Cape, the Western Cape and KwaZulu-Natal in February and March this year.

During the first round of consultations last year the research team, under the supervision of Prof. Elizabeth Snyman-Van Deventer of the UFS, received written submissions from interested members of the public and various associations.

The purpose of this research project is to give an objective overview of the greyhound racing industry nationally as well as internationally. This includes aspects such as animal welfare, social, economical and political issues and the legal framework pertaining to greyhound racing.

The study focuses on the current situation in South Africa and internationally regarding the jurisdictions where the sport is currently active and the current legal framework.

It will also include a comparative study of the situation in countries such as the United States of America, Ireland, England, Belgium, Australia, New Zealand, Canada and Vietnam.

Greyhound racing was banned in South Africa years ago because gambling was regarded as immoral at that time. Now that gambling has been legalised and is regulated there are debates on the legislation of greyhound racing.

The animal welfare and protection groups are against the legalisation of greyhound racing, while other role players have been calling for the racing to be legalised and regulated.

The public consultations will take place as follows:

• 6 February 2009, 09:00-12:30, Protea Edward Hotel, Durban
• 13 February 2009, 09:00-12:30, Protea Sea Point Hotel, Cape Town
• 20 February 2009, 09:00-12:30, Protea Marine Hotel, Port Elizabeth
• 26 February 2009, 09:00-12:30, Garden Court Hotel, Bloemfontein
• 27 February 2009, 09:00-12:30, Protea Manor Hotel, Hatfield, Pretoria
• 6 March 2009, 09:00-12:30, Garden Court East London, Esplanade, East London
• 13 March 2009, 09:00-12:30, Willows Garden Hotel, Potchefstroom

For further information, members of the public who are interested in attending these consultations should contact Mpho Mosing of the dti at 012 394 1504/083 436 5534 or Prof. Snyman-Van Deventer at 051 401 2698 or e-mail it to snymane.rd@ufs.ac.za

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