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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.

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Summer programme a first outside Austria

2012-12-06

Mr Derek Hanekom, Minister of Science and Technology
Foto: Johan Roux
05 Desember 2012

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People often fight about their differences, like skin colour, religion and more. “These differences are minute. We must celebrate our common ancestry and commit ourselves to a common destiny. Your work can make a difference.” This is according to Mr Derek Hanekom, Minister of Science and Technology.

He opened the Southern African Young Scientists Summer Programme (SA-YSSP) at the Bloemfontein Campus on Sunday 2 December 2012. The UFS is the first institution outside Austria to host the Summer Programme. A total of 19 young researchers from 17 countries will be hosted by the UFS until 28 February 2013. Researchers in the programme are, among others, from South Africa, Egypt, China, Italy, Sweden, Iran, Hungary, India, the USA and Indonesia.

The programme will form part of an annual three-month education, academic training and research capacity-building programme jointly organised by the International Institute for Applied Systems Analysis (IIASA), based in Austria, the National Research Foundation (NRF) and the Department of Science and Technology (DST). IIASA is an international research organisation that conducts policy-oriented scientific research in the three global problem areas of energy and climate change, food and water and poverty and equity. South Africa’s engagements with IIASA, specifically with regard to the SA-YSSP, relate primarily to the DST’s Ten-Year Innovation Plan.

Mr Hanekom spoke about the impact the growing global population, which is expected to grow from 7 billion in 2012 to 9 billion in 2050, has on natural resources. “We use purified water to flush our toilets while other people do not have clean drinking water. We cannot carry on like this. Somewhere it must stop, if we do not want to be responsible for the 6th great extinction. We must know how our systems impact on each other.

“We can do things differently and better and should endeavour that other people enjoy luxuries we take for granted,” he said.

He urged the researchers to believe that they can make a difference, share knowledge and translate the knowledge into plans.

Prof. Dr Pavel Kabat, Director/CEO of IIASA, said the summer programme was presented outside Austria for the first time, with plans to expand to Brazil and China in future. Twenty countries are represented on the IIASA board, with more than 3 000 researchers associated with the organisation.

IIASA was launched in 1972 in the days of the Cold War as a “science bridge” between the West and the Soviet Union. It served as a “think tank” for various issues that needed to be resolved. Its mission was reconfirmed after the fall of the Berlin Wall in 1989.

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