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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.

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Renowned writer for Africa Day
2012-05-31

 

Attending the lecture were, from left: Dr Choice Makhetha, Vice-Rector: External Relations; Prof Kwandiwe Kondlo, Director of the Centre for Africa Studies;Prof. Ngugi wa Thiong'o; Prof Lucius Botes, Dean of the Faculty of the Humanities, and Prof Andre Keet, Director of the Institute for Reconciliation and Social Justice..
Photo: Stephen Collett
25 May 2012

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Lecture: THE BLACKNESS OF BLACK: Africa in the World Today

Audio of the lecture

Profile of Professor Ngugi wa Thiong'o (pdf format)

“Flowers are all different, yet no flower claims to be more of a flower than the other.” With these words Kenyan writer and one of the continent's most celebrated authors, Prof. Ngugi wa Thiong’o, delivered the tenth annual Africa Day Memorial lecture on 25 May 2012 in the University of the Free State's (UFS) Odeion Theatre on the Bloemfontein Campus. The lecture was hosted by the Centre for Africa Studies.

Long before Prof. wa Thiong’o was led inside the venue by a praise singer, chairs were filled and people were shown to an adjoining room to follow the lecture. Others, some on the university's Qwaqwa Campus, followed via live streaming.

In his speech titled the Blackness of Black: Africa in the world today, Prof. wa Thiong’o looked at the standing of Africa in the world today. He highlighted the plight of those of African descent who are judged “based on a negative profile of blackness”.

Prof. wa Thiong’o recalled a humiliating experience at a hotel in San Francisco in the United States, where a staff member questioned him being a guest of the hotel. He shared a similar experience in New Jersey, where he and his wife were thought to be recipients of welfare cheques. He said this was far deeper than overt racism.

“The certainty is based on a negative profile of blackness taken so much for granted as normal that it no longer creates a doubt.”

Prof. wa Thiong’o said the self certainty that black is negative is not confined to white perception of black only.

“The biggest sin, then, is not that certain groups of white people, and even the West as a whole, may have a negative view of blackness embedded in their psyche, the real sin is that the black bourgeoisie in Africa and the world should contribute to that negativity and even embrace it by becoming participants or shareholders in a multibillion industry built on black negativity.”

“Africa has to review the roots of the current imbalance of power: it started in the colonisation of the body. Africa has to reclaim the black body with all its blackness as the starting point in our plunge into and negotiations with the world.”

Prof. wa Thiong’o concluded by saying that Africa must rediscover and reconnect with Kwame Nkrumah’s dreams of a politically and economically united Africa.

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