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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

Three Kovsies receive prestigious Mandela Rhodes scholarship for 2015

2014-11-10

From the left: Lehlohonolo Mofokeng, Tumelo Morobane and Zola Valashiya
Photo: Stefan Lotter

The UFS continues to produce leaders and is proud to have three Mandela Rhodes scholars next year.

Lehlohonolo Mofokeng, Zola Valashiya and Tumelo Morobane all received this prestigious scholarship for 2015.

A Mandela Rhodes Scholarship provides full funding for a maximum of two years of postgraduate study. The award is open to all African citizens under the age of 30 years and recipients must study towards an honours or master’s degree at a recognised South African institution. Although there is no maximum number of awards, the scholarships are highly competitive, with fewer than 30 scholarships being awarded each year since its inception in 2005. The scholarships cover tuition, accommodation, meals, book allowance, general allowance, and travel expenses. Recipients of the Mandela Rhodes Scholarship are students with outstanding academic achievements, who also possess leadership ability, entrepreneurial skills, and a commitment to reconciliation. In addition to receiving funding for their studies, scholars also do a leadership development programme while in residence. The award is named after Nelson Mandela and Cecil Rhodes and is administered by the Mandela Rhodes Foundation, which is a partnership between the Nelson Mandela and the Rhodes Trusts.

Lehlohonolo has just finished his BEd Hons in Philosophy and Policy of Education at the UFS. He hopes to enroll for a master’s degree in Education Policy, Planning and Management at the University of Witwatersrand with his Mandela Rhodes Scholarship.

Zola is originally from Johannesburg and is completing his LLB degree at the UFS this year. He is planning to stay at the UFS in 2015 to do his LLM in Constitutional Law or International Human Rights Law.

Tumelo has a BSc Honours in Actuarial Science and will use this scholarship next year to study towards her master’s degree at the UFS.

“I chose to stay at the UFS because I am doing a great master's project with Munich Re through the UFS,” says Tumelo.

“Furthermore, the CEO of the Mandela Foundation, Mr Sello Hatang, asked me to work with the foundation on a few projects that mostly focus on keeping the girl child in school across Africa, as well as helping with providing training and workshops on entrepreneurship to young people.

“So, I am looking forward to a very busy year ahead of me, which will be filled with so much learning, growth and making a difference,” Tumelo says.

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