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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

Future Leader’s Award 2017 goes to UFS Quantity Surveying student

2017-08-11

Celebrating big achievements in the construction
sector at the recent Association of South African
Quantity Surveyors (ASAQS) conference are, from
the left: Cameron Ferreira, junior lecturer in the
UFS Department of Quantity Surveying,
Jhon Thatcher, former UFS student in the same
department who was the second runner-up for the
Gold Medal Award, Dr Stephan Ramabodu, President
of ASAQS, Gerné Bothma, former student in the
department and winner of the Future Leaders’
Award 2017, and Pierre Oosthuizen, UFS lecturer in
the same department.
Photos: Supplied

The Department of Quantity Surveying and Construction Management at the University of the Free State (UFS) made good on its promise to develop independent and critical-thinking graduates who will become leaders in their field. At the recent Association of South African Quantity Surveyors (ASAQS) conference and gala dinner, two students from the department, Gerné Botma and Jhon Thatcher, received awards for their outstanding performance.

Best of the best
Botma received the ASAQS Future Leaders’ Award (2017), an award based on academic achievement in the first three years of study. He competed with nominees from universities across South Africa offering Quantity Surveying programmes, and was the winner in this category.

Thatcher was a second runner-up for the ASAQS Gold Medal Award (being in the top three Quantity Surveying students in South Africa). This is awarded on a number of criteria, including academic achievement. Fourth-year students from all the universities in South Africa offering Quantity Surveying programmes compete for this award, and must display achievement in categories such as academia, leadership, community engagement, and general interests. In 2016, the Gold Medal Award was won by the UFS student, Kamogelo Leeuw.

Keeping abreast of developments
Today, organisations are relying on its members to stay ahead of issues, technologies, innovations and trends. In Quantity Surveying, to keep abreast of developments in the built environment, ASAQS was established as a voluntary association, with one of its goals being advancing and promoting the science and practice of Quantity Surveying. ASAQS works in close collaboration with its member firms, tertiary institutions, and the South African Council for Quantity Surveying Professions (SACQSP), a statutory body that oversees and regulates the profession, and accredit Quantity Surveying programmes in South Africa.

Two staff members from the UFS Department of Quantity Surveying and Construction Management, Cameron Ferreira and Pierre Oosthuizen, attended the recent ASAQS annual conference. Ferreira, a junior lecturer in the department, is the current Chapter Chairperson of the Free State for ASAQS and Oosthuizen, a lecturer in the department, is the former Chapter Chairperson.

According to Ferreira, they attended the conference to keep abreast of the latest development within the industry. “The event also served as a great networking opportunity for the UFS to build partnerships with other industry pioneers,” she said. Making use of opportunities such as these is in line with the UFS’s pursuit of lifelong learning.

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