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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 offers bursaries for interpreters

2005-12-01

The Unit for Language Management (previously Unit for Language Facilitation and Empowerment) at the University of the Free State (UFS) is offering bursaries to persons who want to apply for the Post-graduate Diploma in Language Practice (interpreting) for 2006.

The Unit was involved in the setting up of a comprehensive interpreting infrastructure at the Free State Legislature and provided the interpreting services for the Truth and Reconciliation Commission (TRC) for the latter’s full duration.

“The UFS supports a multilingual society. Our language policy, which was approved by the Council in 2003, is a striking example. This policy is in accordance with the national movement towards multilingualism and the recognition of language rights. Through the training of interpreters the UFS is empowering others to exercise their language rights and to partake meaningfully in formal conversations,“ said Prof Theo du Plessis, head of the UFS Unit for Language Management (ULM).

“The UFS has been using interpreter services at executive management meetings and other occasions such as meetings, seminars and conferences for several years. The demand for these services has risen quite considerably. We have found that the current three interpreters on the Main Campus will soon not be able to cope with this demand,” said Prof du Plessis.

According to Prof du Plessis institutions like the Mangaung Local Municipality and the Motheo District Municipality use the interpreter services of the ULM on a regular basis.
“Because the demand for interpreter services is becoming so great, the demand for trained interpreters is also increasing. This is why we are offering bursaries for persons who want to be trained as interpreters to register in 2006 for the Post-graduate Diploma in Language Practice (interpreting) as offered by the UFS Department of Afro-asiatic Studies and Language Practice and Sign Language,” said Prof du Plessis.

According to Prof du Plessis the UFS will be able to use these students on an ad-hoc basis to assist with interpreter services on the Main Campus or to deliver interpreter services to institutions outside the UFS.

The bursaries will preferably be awarded to persons with English as mother tongue with an above average knowledge of Afrikaans or Sesotho. The duration of the bursaries is one year and only tuition fees will be paid. “To qualify for the bursaries, prospective students must have an undergraduate qualification,” said Prof du Plessis.

The closing date for applications is 25 January 2006. For any enquiries, Mrs Susan Lombaard can be contacted at (051) 401-2405 or 072 605 4966 during office hours or at lombasc.hum@mail.uovs.ac.za.

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

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