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Prof Botma Visser takes on rust diseases threatening South Africa’s wheat

09 September 2025 | Story Martinette Brits | Photo Stephen Collett

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 takes 70 first-year students to the USA

2010-08-20

Mr Rudi Buys (middle, with tie) with some of the students selected for the F1 Programme
Photo: Gerhard Louw

The University of the Free State (UFS) has announced the names of the first ever group of 70 first-year students that will travel to the United States of America (USA) as part of the university’s Student Leadership Development Programme.

This group of students will spend two weeks at universities in the USA to experience student life and learn about leadership and diversity at these universities.

“This is a first for not only the UFS, but also for South Africa and we are incredibly proud. The programme is unique to any other student leadership development programme in the country. We are leading the way and are taking students to live and learn amongst students at various universities across the USA,” said Mr Rudi Buys, Dean of Student Affairs at the UFS.

The programme was one of the goals of Prof. Jonathan Jansen, Rector and Vice-Chancellor of the UFS, which he aimed to realise when he was appointed by the UFS in 2009.

“With the programme we want to develop participants’ thinking and capacity to lead in the contexts of diversity and change and we hope to direct them to programmes leading change in student life in general upon their return,” Mr Buys said.

The 70 students will leave for the USA on 22 September 2010. After spending some time there and learning more about their American peers’ lives and culture, they will return to the UFS on 7 October 2010.

“We took great care in selecting the 70 participants. They are representative of all our students, as well as students from our Qwaqwa Campus,” said Mr Buys.

A rigorous selection process was followed, which focused on the students’ academic excellence, their participation in student- and residence-life programmes and their interest in growing in the areas of, amongst others, leadership, diversity and citizenship. Each candidate had to undergo a pre-selection process, followed by a panel interview consisting of staff from various faculties and divisions at the UFS.

The students will stay in groups of about ten at the various universities, which include universities such as Cornell University, New York University, the University of Massachusetts, the Appalachian State University and Virginia Polytechnic University. “These universities will provide our students with accommodation and will present various academic and cultural programmes which our students will participate in and learn from,” said Mr Buys.

“We have also put a programme in place to prepare our students thoroughly for the trip. Because some of them have never travelled on an aeroplane, let alone travelled to a foreign country, we have made arrangements with the Department of Home Affairs for assistance with travel documentation, as well as special arrangements with the USA Embassy for assistance with visas. They will also be attending workshops focusing on, amongst others, research, leadership and diversity before their departure on 22 September 2010.

“Upon their arrival in the USA the group of students will firstly be taken to Washington DC where they will be briefed about American customs, etc. From there they will be placed at the various universities,” said Mr Buys.

Upon their return the students must be involved in student-life programmes on campus, establish volunteer programmes and initiate and establish mentoring programmes for their fellow students. “We want them to give back what they have learnt and experienced,” said Mr Buys.

“We are planning on implementing the Student Leadership Development Programme as an annual programme and are looking forward to this incredible programme through which this group of first-year students will have the opportunity of a lifetime to be true ambassadors of South Africa and, in particular, the UFS, as they leave for the USA,” he said.

Media Release:
Mangaliso Radebe
Assistant Director: Media Liaison
Tel: 051 401 2828
Cell: 078 460 3320
E-mail: radebemt@ufs.ac.za
20 August 2010

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