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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 plans to improve undergraduate pass rate

2005-01-13

The University of the Free State (UFS) will introduce a new foundation programme this year 2005 in an effort to improve the academic performance of undergraduate students.

According to Mr Francois Marais, Head: Centre for Higher Education Studies and Development (CHESD) at the UFS, the programme will assist students by providing for the development of cognitive and critical thinking skills by means of the integration of appropriate thinking skills (such as creative thinking, decision-making, problem solving, reasoning, and how to learn), into the subject content of university courses.

“The foundation programme will benefit students from disadvantaged school backgrounds and, in future, those whose performance in proficiency tests points to the need for additional development in, for example, language proficiency, mathematical literacy, computer skills and life skills,” says Mr Marais.

Based on their level of achievement in the final Grade 12 examination (Senior Certificate), students will be referred to the foundation programme.

In order to improve students writing and reading abilities for higher education studies, foundation programme students will be offered academic language courses in English and Afrikaans.

Kovsie Counselling will render appropriate services, eg career guidance and support to these students.

The new foundation programme will be implemented in the faculties of Natural and Agricultural Sciences, Economic and Management Science, the Humanities and Law.

The duration for this programme differs from faculty to faculty. In the Faculty of Law it will take five years, while in the faculties of the Humanities, Natural and Agricultural Sciences, and Economic and Management Sciences it will take four years.

The national Department of Education will fund the foundation programme for three years. Funding for such programmes was made available to all higher education institutions in South Africa.

The welcoming function for all new first-year students and their parents will take place on Saturday 15 January 2005 at 11:00 in the Callie Human Centre on the main campus in Bloemfontein.

The registration of first-time entering first-year students who applied before 30 November 2004 to study at the Bloemfontein campus will take place from Monday 17 January 2005 to 21 January 2005 at the Callie Human Centre.

Senior undergraduate students (that is, students entering their second or later year of study) may register from 22 to 29 January 2005.

Postgraduate students, first time entering first year students and other students who applied for admission to the main campus after 30 November 2004 must register at the Callie Human from 31 January 2005 to 4 February 2005.

Due to the limitations placed by government on student numbers, the applications of students who applied late will be regarded as pending and will be processed as places become available.

Media release
Issued by: Lacea Loader
Media Representative
Tel: (051) 401-2584
Cell: 083 645 2454
E-mail: loaderl.stg@mail.uovs.ac.za
13 January 2005

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