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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

UFS committed to a two-language model
2010-08-13

  Prof. Jonathan Jansen

The University of the Free State (UFS) will continue to use a two-language model while it builds capacity for research and teaching in Sotho languages.

This was announced by the Rector and Vice-Chancellor of the UFS, Prof. Jonathan Jansen, when he delivered the 29th DF Malherbe Memorial Lecture on the Main Campus in Bloemfontein yesterday, on the topic: The politics and prospects of Afrikaans, and Afrikaans schools and universities.

“In the course of time black students will learn Afrikaans, white students will learn Sesotho, and all students will learn decent English,” he said.

“Classes will remain in English and Afrikaans, especially in the first years of study. Dual-medium classrooms will break down the racial isolation where outstanding university teachers are comfortable in both languages. Parallel-medium classes will exist where large numbers enable such a facility.”

He said schools and higher education institutions that continue to use language as an instrument of exclusion, rather than inclusion, would remain “culturally and linguistically impoverished”. He said the future of Afrikaans in these institutions lay in its inter-dependence and co-existence with other languages.

“A strong two-language model of education, whether in the form of double- or parallel-medium instruction within a racially integrated campus environment is the only way in which Afrikaans can and should flourish in a democratic South Africa,” he said.

“It is the only model that resolves two problems at the same time: the demand for racial equity, on the one hand, and the demand for language recognition, on the other hand.”

He said the idea of an exclusively Afrikaans university was a “dangerous” one.

“It will lock up white students in a largely uni-racial and uni-lingual environment, given that the participation rates in higher education for Afrikaans-speaking black students are and for a long time will remain very low,” he said.

“This will be a disaster for many Afrikaans-speaking students for it will mean that the closed circles of social, cultural and linguistic socialization will remain uninterrupted from family to school to university.

“Rather than prepare students for a global world marked by language flexibility and cultural diversity, students will remain locked into a sheltered racial environment at the very stage where most South African students first experience the liberation of the intellect and the broadening of opportunities for engaging with the world around them.

“The choice at the Afrikaans universities, therefore, must never be a choice between Afrikaans and English; it must be both.”

Media Release
Issued by: Lacea Loader
Director: Strategic Communication (actg)
Tel: 051 401 2584
Cell:   083 645 2454
E-mail: loaderl@ufs.ac.za
13 August 2010

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