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09 September 2025 | Story Martinette Brits | Photo Stephen Collett
Prof Botma Visser
Prof Botma Visser delivered his inaugural lecture at the University of the Free State, highlighting nearly two decades of research on wheat rust and global food security.

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

Machinery and equipment to the value of R6 million acquired by UFS Instrumentation Division
2015-07-02

Photo: Supplied

At an information session held on the Bloemfontein Campus, the Instrumentation Division in the Faculty of Natural and Agricultural Sciences at the University of the Free State (UFS) introduced its new Computer Numeral Control (CNC) machines to the value of R6 million.

Initially, the primary aim of the Instrumentation workshop was to design, produce, and maintain special research equipment which is unavailable on the market, mainly for academic departments. The small-scale production focused on producing support material and equipment for research work.

However, with new equipment and machinery the Division now also can deliver a service to corporate companies and external associates.
 
The CNC machines include a 5-axis Vertical Machining Centre from Haas imported from America. This is one of only four in South Africa, with two in Johannesburg and one in Cape Town.  The lathe makes it possible to produce sophisticated parts, which were previously cumbersome and difficult to make. The machines also cover a wide spectrum in the mechanical field such as the the FLOW Water Jet, which cuts a wide variety of material ranging from titanium to wood without utilising heat, thus saving electricity. This makes it possible to cut a wide variety of materials.

With the new machinery now available, the Instrumentation Division is able to perform high quality and quantity production with precision.

“The advantage of the machinery is that it stimulates production, and is much faster and more accurate than the conventional way of doing things,” said Pieter Botes, Head of the Division.

Botes explained that, by having students and professional artisans at the university design and manufacture equipment, costs are reduced when compared with the expensive nature of equipment and tools found in the market. In addition, “the machines broaden the scope of research conducted” said Botes. The technical dynamics of the machinery advances the scientific knowledge needed to operate it, so bridging the gap between theory and practice.

The Central University of Technology, Signs Division Bloemfontein, Product Development Technology Station (PDTS), Maizey’s, and Knottco Truckparts are some of the university’s trade partners.

The workshop collaborates with the Chemistry, Physics, Microbiology, Botany, Agriculture, and Electronics departments, as well as the Institute of Groundwater Studies at the UFS, and others. These departments receive services in the form of pipette stands, containers for test tubes, bottles, laboratory trolleys, stands for cadavers for Anatomy, pump repairs, stainless steel bailers, filaments, and heaters.

The Instrumentation Division is, therefore, a vital support unit for the Faculty of Natural and Agricultural Sciences as well as the university at large.

Companies, institutions, or individuals who need the Division’s expertise may contact Pieter Botes on botespds@ufs.ac.za.

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