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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 appoints new council members

2004-06-07

The council of the University of the Free State (UFS) last week appointed two new council members. One of the members, Mrs Busiswa Tshabalala, will represent the Qwaqwa community. It is the first time since the incorporation of the Qwaqwa into the UFS campus last year that a council member was elected to represent the Qwaqwa community.

Mrs Tshabalala obtained her BA Hons in History from the University of the North’s Qwaqwa campus in 1992 and a B Ed degree in leadership management from the UFS in 1998. She was the first female deputy principal at the Harrismith Secondary School (1989-1992) and principal of the Forty Second Hill Teachers’ Centre in the Vrede area office of the Free State Department of Education. In 2001 she was seconded by the Free State Department of Education to coordinate programme 1 and 2 for Link Community Development. She is currently the director of the Thabo Mofutsanyana education district of the Free State Department of Education.

Dr Susan Vosloo, international acclaimed cardiologist, is the other new member of the council. Dr Vosloo, old Kovsie of the year 1989, obtained the MB Chb degree in 1980 at the UFS, an M Med cardiothoracic surgery and in 1998 the FCS (SA) qualification in cardiothoracic surgery at the College of Medicine of South Africa (CMSA). Dr Vosloo’s career extends over a wide spectrum and she specialises in pediatric and adult cardiothoracic surgery. In 1993 she took part in the first heart transplant in Johannesburg at Milpark Hospital, in 1997 she did the first hear-lung transplant at City Park Hospital in Cape Town and in 1997 a heart transplant on a 3-year old child.

She has a cardiothoracic surgery at the Christiaan Barnard Memorial Hospital in Cape Town since 1991 and in also part-time involved with the Red Cross Memorial Hospital in Cape Town.

“It is a great honour for the UFS to welcome two women with so much expertise and experience on the council. Their presence strengthens the UFS’s continued effort to transform the council,” said judge Faan Hancke, chairperson of the UFS council..

Both Mrs Tshabalala and Dr Vosloo’s appointments are until June 2008.

The following council members have been re-elected until June 2008:

Prof Dines Gihwala - vice-chairperson of the council
Dr Nathan Bagarette
Dr Frans Kotzé

Dr Kobus Laubscher was elected by the donors as representative for a further term until June 2008. Me Winifred Hoexter was elected by the Alumni as the third representative. She has been a foundation donor of the UFS since 1997 and committee member of the Kovsie Alumni Trust since 2000. Me Hoexter’s term is until June 2008. The other Alumni representatives are judge Faan Hancke and Mr Jan Grobler, whose term is until June 2006.

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

7 June 2004

Mrs Busiswa Tshabalala

Dr Susan Vosloo

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