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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 Rose Ball promises to be an unforgettable experience

2005-09-08

On Saturday 15 of October 2005, the Department of Paediatrics and Child Health at the University of the Free State (UFS) in collaboration with Medi-Clinic, are hosting a Rose Ball in aid of children and babies with serious diseases and special needs.

The Bloemfontein public should get ready for one of the most magnificent events ever held in the city.

The Rose Ball promises to offer an evening of glamour, elegance and beauty which will make it an unforgettable and unique event. The Department aims to make the Rose Ball an annual event to which the Bloemfontein public can look forward to with expectation.

“Excellent food and wine, a 35 man symphony orchestra and of course a magical setting awaits those who attend the Rose Ball. We will do everything possible to make guests feel special, so that they return to the Rose Ball year after year. In this way, we can ensure an annual income from this event for children and babies who are very ill and need specialised care,” said Prof. André Venter, Head of the Department of Paediatrics and Child Health.

The Department of Paediatrics and Child Health at the UFS is responsible for the tertiary care, that is highly specialised care, of around 1 000 000 children in the Free State, Northern Cape, North-West, Eastern Cape and Lesotho. Approximately 13 000 out-patients are treated at the Universitas and Pelonomi Hospitals annually. Children who suffer from cancer, heart disease, neurological disease and endocrinological and gastro-enterological conditions are treated. The Department is also responsible for children who need intensive care and children with contagious diseases. In addition, there is a large neonatal unit where prematurely born babies are treated.

The level of health care needed to treat these children and babies, necessitate highly specialised equipment and knowledge. However, it is not always possible to replace or upgrade equipment, due to the lack of much-needed funds. That is why a fund was created within the Department to satisfy the need for funds. The Rose Ball promises to eventually give a vital boost to the fund that will go a long way toward providing in the special healthcare needs of these patients.

The Rose Ball is made possible thanks to the support of Medi-Clinic.

“Medi-Clinic is honoured to be involved in this great effort and in this way take hands with the Department of Paediatrics and Child Health at the UFS. There are so many children with life-threatening diseases today and we cannot afford to be uninvolved in any effort to make life better and easier for these children. We at Medi-Clinic, as a private sector company, look forward to establishing a long-term commitment with the Department of Paediatrics and Child Health,” said Mr Sakkie van der Merwe, Hospital Manager of Bloemfontein Medi-Clinic.

Only a limited number of tables are still available for the Rose Ball. Tickets cost R500 per person or R5 000 per table of 10 people.

Those who are interested can contact Ms Ilse Olivier at 051-4012415 or Ms Adele van Aswegen at 051-4013535 for more information.

Media release
Issued by:  Lacea Loader
   Media Representative
   Tel: (051) 401-2584
   Cell: 083 645 2454
   E-mail: loaderl.stg@mail.uovs.ac.za
8 September 2005

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