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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 presents first Beyers Naudé Memorial lecture

2010-09-16

At the Beyers Naudé Memorial lecture were, from the left: Prof. Jonathan Jansen, Rector and Vice-Chancellor of the UFS; Rev. Cedric Mayson; and Mr Kgotso Schoeman, Chief Executive Officer of Kagiso Trust.
Photo: Dries Myburg

The seventh Beyers Naudé Memorial lecture was presented for the first time at the University of the Free State (UFS) this week. This lecture that is presented at a different university each year took place on the Main Campus of the UFS in Bloemfontein this year. Rev. Cedrick Mayson presented the lecture with under the theme: Crafting a legacy.

According to Rev. Mayson more deeply rooted forms of suppression came forward after the democratic elections in 1994. Liberation from apartheid was, according to Mason, very superficial. The poor were still severely suppressed at economic, political, cultural, religious and environmental level. “We have to apply Beyers Naudé’s legacy of liberation in these areas,” Rev. Mayson declared.

“The system according to which the rich become wealthier and the poor become poorer must be replaced by a system where everybody can have enough. This is only possible with the insight of the oppressed.

“The government and the opposition are dominated by people who seek advantage for their own gain. Regardless of democratic slogans and some enlightened individuals’ rules against corruption and violence, we lack the political will to engage in the transformation of the whole world for the good of all earthlings,” said Rev. Mayson.

According to him, consumer culture has become a fine-tuned instrument for keeping people incomplete, shallow and dehumanised.

“Religions are self-centred. Leaders from most of the religious groupings criticised apartheid but they never joined the struggle to assist in demolishing apartheid. It appears as if religious institutions are not able to address the causes of poverty because they themselves are too rich and too powerful,” said Rev. Mayson.

He ended with the following words: “What we need is a leap of faith. Beyers knew that. The world is waiting for people to claim their legacy and to accomplish a post-religious secular spirituality of ubuntu.”

Rev. Mayson is a former Head of Religious Affairs of the ANC. He had also been a former staff member of the Christian Institute before it was banned. Furthermore, he was the Editor of Pro Veritate. Before he retired, he had also been involved in the South African Council of Churches and the World Conference for Peace.

The memorial lecture, a collaborative effort of the UFS and Kagiso Trust, endeavours to involve South Africans in dialogue about issues that affect our nation. This year the lecture was presented at the UFS for the first time and it will take place on the Qwaqwa Campus of the UFS next year.

Media Release
Issued by: Mangaliso Radebe
Assistant Director: Media Liaison
Tel: 051 401 2828
Cell: 078 460 3320
E-mail: radebemt@ufs.ac.za
16 September 2010

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