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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

Shortage of quantity surveyors discussed at UFS

2006-03-24

During the recent visit of the Association of South African Quantity Surveyors (ASAQS) to the University of the Free State (UFS) were from the left Mr Egon Wortmann (Director: ASAQS), Prof Basie Verster (representative of the Free State on the ASAQS and head of the Department of Quantity Surveying and Construction Management at the UFS), Mr Greyling Venter (Chairperson: Free State branch of the ASAQS), Prof DG Brümmer(Vice-President: ASAQS) and Mr Patrick Waterson (President: ASAQS).
Photo supplied

Shortage of quantity surveyors discussed at UFS

“The South African building industry is experiencing an unprecedented high level of economic growth and prosperity. This is causing a definite shortage of registered quantity surveyors,” said Mr Egon Wortmann, Director of the Association of South African Quantity Surveyors(ASAQS) during the association’s recent visit to the Department of Quantity Surveying and Construction Management at the University of the Free State (UFS).

“This shortage is especially noticeable in local and national governments where unqualified and inexperienced staff, consultants and/or facilitators are now appointed,” said Mr Wortmann.

In doing so, the authorities that have adopted this approach are according to Mr Wortmann actually acting illegally and are not in compliance with the legal and statutory requirements of South Africa. “These unprofessional practices are unproductive, it leads to frustration and is strongly condemned by the ASAQS,” he said.

“The service delivery of these unqualified and unregistered service providers is often sub standard and does not comply to the legal requirements of the profession. It may also result in the tarnishing of the image and high professional standards set by the quantity surveying profession,” said Mr Wortmann.

“Universities offering programmes in quantity-surveying and construction management are also negatively affected by the high levels of activity in the building environment. Suitable lecturing staff are leaving the academic institutions as they are attracted to better opportunities being offered in the building industry. The ability of the tertiary institutions to attract young academics, to train them and to keep them in the longer term, is therefore almost impossible”, said Prof Basie Verster, head of the Department of Quantity Surveying and Construction Management at the UFS and representative of the Free State on the ASAQS.

According to Prof Verster the UFS supplies more than its quota of qualified quantity surveyors to the South African building industry. “Although more than 460 students are registered in construction related programmes at the UFS, we are as the ASAQS’s concerned about the shortage of students that can enter the construction industry. In our case, we are experiencing a shortage in black female students,” he said.

“Of the 460 postgraduate students, 38% are black of which 20% are female students. Graduates do also not necessarily stay in the country. As the UFS’s programmes are accredited overseas, a lot of our students leave the country for working opportunities elsewhere,” said Prof Verster.

Mr Patrick Waterson, President of the ASAQS, appealed to quantity surveyors to, when they are approached, consider academic careers or to make themselves available to lecture on a part time basis. “I also appeal to quantity-surveying practices, construction companies and developers to consider taking part in training activities,” he said.

The ASAQS has over the years developed a proud tradition within the quantity-surveying profession. Consequently membership of this organisation is a sought after goal for many members within the building environment. International agreements with various countries are also in place whereby it is mutually agreed that local as well as overseas qualifications are mutually acceptable on a reciprocal basis.

A more recent addition to the list of agreements is the reciprocity agreement entered into with the Royal Institution of Chartered Surveyors which makes it possible for South African based quantity surveyors to practice in over 120 countries worldwide.

Media release
Issued by: Lacea Loader
Media Representative
Tel: (051) 401-2584
Cell: 083 645 2454
E-mail: loaderl.stg@mail.uovs.ac.za
23 March 2006

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