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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

SASOL TRAC laboratory launched at UFS Qwaqwa Campus

2006-05-08

Some of the guests attending the launch of the Sasol TRAC Laboratory at the University of the Free State's (UFS) Qwaqwa Campus were from the left Prof Peter Mbati (Principal of the Qwaqwa Campus), Mrs Zimbini Zwane ( Communications Manager of Sasol Infrachem), Prof Gerhardt de Klerk (Dean : UFS Faculty of the Humanities), Prof Fred Hugo
Director of TRAC SA) and Prof Jack van der Linde (Director of RIEP at the UFS).

SASOL TRAC laboratory launched at UFS Qwaqwa Campus

The Research Institute for Education Planning (RIEP) of the University of the Free State (UFS) today unveiled the Sasol TRAC Laboratory at its Qwaqwa campus.

The laboratory will be used to help grade 10, 11 and 12 learners and educators from the Qwaqwa region to conduct the experiments from the physical sciences outcome-based curriculum.

“The Sasol TRAC Laboratory introduces learners not only to the latest technology used by engineers and other scientists in practice but also to stimulate the learner’s interest in the field of science in such a way that more of them will enter into science related careers,” says Mr Cobus van Breda, Co-ordinator of the TRAC Free State Regional Centre.

According to Mr van Breda the newly established Sasol TRAC Laboratory will enable RIEP to train learners and their educators in Physical Sciences. The laboratory will consist of six work stations equipped with computers and electronic sensors.

“Learners from the Qwaqwa region will visit the Sasol TRAC Laboratory on regular basis to conduct experiments based on the curriculum. Data will be collected with electronic apparatus and presented as graphs on the computer so that results can be analysed and interpreted,” says Mr van Breda.

“There is a serious shortage of suitable qualified teachers in maths and science in the Qwaqwa region. Many schools in the region are not yet part of the RIEP project and are in dire need of assistance. A large number of these schools are in remote areas not reached regularly by intervention programmes,” says Prof Peter Mbati, Principal of the UFS Qwaqwa Campus.

“The establishment of the Sasol TRAC Laboratory at the Qwaqwa Campus provides us the opportunity to engage with our community and assist in the development and training of these vital education subjects. We are pleased that Sasol agreed to fund the project,” says Prof Mbati.

Students from the Qwaqwa Campus will also benefit from the TRAC programme. “Some promising students will also undergo further training and become assistants for the TRAC programme,” says Prof Mbati.

“Nurturing science and mathematical skills is of great importance in growing our national economy. Annually, Sasol invests more than R50 million in supporting mathematical and science education in South Africa. Our primary aim is to increase the number of learners gaining access to tertiary education in the science fields. Therefore, our Corporate Social Investment (CSI) education interventions at secondary school level focus on educator development and direct learner interventions such as the Sasol TRAC Laboratory,” explains Ms Pamilla Mudhray, CSI and SHARP manager at Sasol.

According to Ms Mudhray the implementation of the National Curriculum Statement for physical sciences in the further education and training (FET) phase from 2006, under resourced schools will need greater access to the tools and equipment necessary to teach the syllabus and fulfil the ideals of the curriculum.

TRAC South Africa is a national non-profit programme focused on supporting and expanding science, mathematics and technology education in secondary schools. The programme was first introduced to South Africa in 1994. In 2005, RIEP established the TRAC Free State regional centre on the UFS 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 May 2006

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