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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

Prof Antjie Krog speaks on verbalising revulsion and the collusion of men
2015-06-26

From the left are Prof Lucius Botes, UFS: Dean of the Faculty of the Humanities; Prof Helene Strauss, UFS: Department of English; Prof Pumla Gobodo-Madikizela, UFS: Trauma, Forgiveness and Reconciliation Studies; Prof Antjie Krog, UCT: Department Afrikaans and Dutch; Dr Buhle Zuma, UCT: Department of Psychology. Both Prof Strauss and Dr Zuma are partners in the Mellon Foundation research project.

“This is one of the bitterest moments I have ever endured. I would rather see my daughter carried away as a corpse than see her raped like this.”

This is one of 32 testimonies that were locked away quietly in 1902. These documents, part of the NC Havenga collection, contain the testimonies of Afrikaner women describing their experiences of sexual assault and rape at the hands of British soldiers during the South African War.

This cluster of affidavits formed the foundation of a public lecture that Prof Antjie Krog delivered at the University of the Free State’s (UFS) Bloemfontein Campus on Tuesday 23 June 2015. The lecture, entitled ‘They Couldn’t Achieve their Goal with Me: Narrating Rape during the South African War’, was the third instalment in the Vice-Chancellor’s Lecture Series on Trauma, Memory, and Representations of the Past. The series is hosted by Prof Pumla Gobodo-Madikizela, Senior Research Professor in Trauma, Forgiveness, and Reconciliation Studies at the UFS, as part of a five-year research project funded by the Andrew W. Mellon Foundation.

Verbalising revulsion

The testimonies were taken down during the last two months of the war, and “some of the women still had marks and bruises on their bodies as evidence,” Prof Krog said. The victims’ words, on the other hand, struggled to express the story their bodies told.

What are the nouns for that which one sees? What words are permissible in front of men? How does one process revulsion verbally? These are the barriers the victims – raised with Victorian reserve – faced while trying to express their trauma, Prof Krog explained.

The collusion of men

When the war ended, there was a massive drive to reconcile the Boers and the British. “Within this process of letting bygones be bygones,” Prof Krog said, “affidavits of severe violations by white men had no place. Through the collusion of men, prioritising reconciliation between two white male hierarchies, these affidavits were shelved, and, finally, had to suffer an embargo.”

“It is only when South Africa accepted a constitution based on equality and safety from violence,” Prof Krog said, “that the various levels of deeply-rooted brutality, violence, and devastation of men against the vulnerable in society seemed to burst like an evil boil into the open, leaving South African aghast in its toxic suppurations. As if, for many decades, we did not know it was there and multiplied.”

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