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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

Charlotte Maxeke Memorial Lecture launches national Women’s Month Celebrations
2012-08-17

Free State Premier Ace Magashule with President Jacob Zuma during the Charlotte Maxeke Memorial Lecture held on the Bloemfontein Campus.
Photo: Stephen Collett
6 August 2012

 

“Mother of African Freedom, heroine, teacher, unifier and true revolutionary.”

That is how dignitaries such as President Jacob Zuma, African Union (AU) Commission Chairperson Dr Nkosazana Dlamini Zuma, Basic Education Minister Angie Motshekga and others described Charlotte Maxeke, the woman they came to celebrate at the University of the Free State on 4 August 2012.

President Zuma honoured the life of the ANC Women’s League stalwart in delivering the fifth annual Charlotte Maxeke Memorial Lecture. The event officially kicked off the national Women’s Month celebrations and thousands of people made their way to the Bloemfontein Campus to listen to the President’s address.

President Zuma told the audience in the Callie Human Centre that women activism had not started with the 1956 march to the Union Buildings – it began much earlier. He spoke about Charlotte Maxeke’s leading role in the landmark 1913 march against pass laws in Bloemfontein and said this had inspired bravery and enthusiasm in the hearts of many in the struggle.

“As a collective, we must emulate the contribution of Mama Maxeke. In her honour, we must continue to open new paths for women, enable them to break new ground in leadership." President Zuma said Charlotte Maxeke, who believed a woman’s place was everywhere, had to be smiling with regard to Dr Dlamini Zuma’s appointment as Chairperson of the AU Commission.

In her speech, Dr Dlamini Zuma encouraged women to embrace the African Decade of Women, saying it was their responsibility to define and implement the changes they want to see. “We should define for ourselves what this decade means, define that we want to do, the role we want to play and achieve during this decade.”

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