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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 to implement a policy on HIV and Aids

2005-03-14

The Council of the University of the Free State (UFS) approved the implementation of a policy on HIV and AIDS.

“With this policy we recognise the seriousness of the HIV and AIDS epidemic and the potential impact this disease can have on both the UFS and the wider society. We are committed to addressing HIV and AIDS in a positive, supportive and non-discriminatory approach by providing resources and leadership to implement HIV and AIDS university-based, as well as community outreach programmes,” said Dr Ezekiel Moraka, Vice-Rector: Student Services at the UFS.

The objectives of the policy include:

The protection of individual rights of confidentiality and freedom from discrimination.
The promotion of a sustained educational programme that provides counseling and current accurate information to the University community and to the outside community.
The promotion of behaviors that reduce or minimise the risk of acquiring HIV infection and generally create a safe environment.
The provision of leadership in teaching, research and community service on HIV and AIDS and its impact.
The provision of leadership in promoting the human rights based approach to HIV and AIDS, and thereby also breaking down the stigma attached to the illness.

“The policy also makes provision for the establishment of a Centre for HIV and AIDS within Kovsie Health. This centre will render HIV and AIDS related support services and initiatives to the whole campus,” said Dr Moraka.

According to Dr Petro Basson, head of the Centre for HIV and AIDS at the UFS, there is less than 1% incidence of HIV positive cases amongst undergraduate students on the main and Vista campuses. All these students take part in a voluntary confidential counseling and testing programme (VCCT). In the case of postgraduate students, there is about 1% incidence on both campuses.

“The Centre for HIV and AIDS has led in the development of information campaigns and workshops for students and staff to make them aware of the risks of HIV and AIDS and the necessary measures to ensure their safety. We have found that, because students have access to the right information, they are more cautious when it comes to HIV and AIDS. Awareness campaigns are also conducted throughout the year – especially during rag and intervarsity,” said Dr Basson.

“Some departments have also taken the lead in introducing aspects of HIV and AIDS into academic programmes while important research on the HIV and AIDS topic has already been completed and receives continuous attention,” said Dr Basson.

To achieve a coordinated approach, a Life Skills Forum will be established consisting of representatives of among others the Student Representative Council (SRC), academic departments, trade unions, Kovsie Counseling and Development, etc.

“With this policy the UFS pledges its commitment to participate actively in the fight against the disease,” said Dr Moraka.

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

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