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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

New building for Centre for Financial Planning Law

2012-04-23

A graphic illustration of the new building for the Centre for Financial Planning Law.
19 April 2012

During a recent tree planting ceremony, the Centre for Financial Planning Law in the Faculty of Law officially handed over the site for a new building for the centre. The building should be complete by the end of 2012.

The Centre for Financial Planning Law’s present premises has become too small for the needs of the centre, thus a decision was taken to build a new building.

The centre, which was opened in 2001 with three staff members, grew during the past 11 years to a centre with 13 permanent staff members. Some 1 300 students – 120 undergraduate and 1 200 postgraduate students in the Postgraduate Diploma in Financial Planning Law and the Advanced Postgraduate Diploma in Financial Planning Law respectively – are enrolled at the centre. Undergraduate students attend weekly contact sessions while the postgraduate students all study electronically through distance education.

According to Mr Rudolf Bitzer of Bitzer Design Studio, one of the two architecture firms involved in the development of the building, the new building was planned in order to to make provision for future extensions. “The opportunity for the centre to function independently was important from the beginning and facilities had to be positioned in such a way that the lecture hall and committee room could be hired out commercially when lectures were not being presented.

“The building consists of a large reception venue, which gives access to a lecture hall (which can be subdivided), a committee room, public amenities and a reception counter. The centre will present about ten lectures annually in its own building and the lecture hall can accommodate 80 students. Exams will also be written in the venue,” said Mr Bitzer.

The usable inside area of the building totals 827 square metres.

The staff function in their own section of the building, with the offices arranged around a courtyard. Security access makes it a secure environment. In addition, staff have access to a staff room with a service hatch to the reception room, reception counter, personal assistant’s office, nine individual offices and a large open plan office, a storeroom, a cleaners’ room and facilities for staff.

“With the design, an attempt was made to make the building stand comfortably in the landscape without disappearing into the natural landscape. It is an unpretentious building, which seeks to provide well articulated architecture,” said Mr Bitzer.

The architecture firms involved are Bitzer Design Studio and Roodt Architects.

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