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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

Leah Tutu - from a humble heritage to a matriarch of devotion
2013-10-18

 

Leah Tutu
18 October 2013

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Leah Tutu Symposium: YouTube video

There are treasures in life, but owners are few
Of money and power to buy things brand new
Yet you can be wealthy and feel regal too,
If you will just look for the treasures in you …

The joy and the laughter, the smile that you bring;
The heart unafraid to love and to sing;
The hand always willing to help those in need;
Ones quick to reach out, to labour and feed.

So thank you for sharing these great gifts inside;
The caring, the cheering, the hug when one cried.
Thanks for the energy, encouragement too,
And thank you for sharing the treasures in you. (Author unknown)

With these words, Thandeka Tutu-Gxashe embodied the celebration in honour of her mother, Leah Tutu.

On Thursday 17 October 2013, the Annual Intercontinental Leah Tutu Symposium was launched at the UFS’ Bloemfontein Campus. Dignitaries and students alike flocked to the Centenary Hall where friends and family shared their immense love and respect for Ms Tutu.

Approaching the podium, Eunice Dhadhla (co-founder with Ms Tutu of the Domestic Workers Union) started humming and in an instant the audience had risen to their feet and the words “My mother was a kitchen girl. My father was a garden boy. That’s why I’m a unionist”, reverberated through the hall.

“I am what I am today because of her,” Dhadhla said of Ms Tutu. They have walked a long hard road together to ultimately unite domestic workers across the globe. Stretching her small body to its full length, Dhadhla imparted one of the most valuable lessons she has learned from Ms Tutu, “Stop crawling, stand up and walk for yourself.”

As soon as Dr Sindiwe Magona – acclaimed writer and poet – ascended the stage, her energy rushed across the room with electrifying intensity. Her high regard for Ms Tutu as public icon as well as a mother, wife and friend, was palpable. Belting out line after line of a poem she wrote especially for Ms Tutu, the audience echoed their agreement in a mutual exchange.
No sooner were they seated, than Archbishop Desmond Tutu and Prof Jonathan Jansen had the crowd roaring with laughter. Archbishop Tutu’s familiar chuckle peppered his story of how he came to propose to his wife. It was clear, though, how much he reveres Ms Tutu’s presence in his life. With enormous awe, he revealed her innate power, specifically during difficult times in our country’s past – from weathering death threats against her husband to public humiliation.

But despite adversity and heartache, in front of the Centenary Hall, this matriarch stood up and beamed joy into everyone present.

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