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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 unveils portrait of Ms Winkie Direko

2005-11-28

During the unveiling ceremony were from the left Prof Frederick Fourie (Rector and Vice-Chancellor of the UFS), Mrs Direko, Judge Faan Hancke (Chairperson of the UFS Council) and Dr Charles Nwaila (Director-General of the Free State Provincial Government and Vice-Chairperson of the UFS Council). The blue background of the portrait depicts Ms Direko's philosophy of "the sky is the limit". She also wore the same outfit as what she has on in the portrait. Photo: Stephen Collett

UFS unveils portrait of Ms Winkie Direko
A portrait of Ms Winkie Direko, former Chancellor of the University of the Free State (UFS) and Premier of the Free State Province and currently a Member of Parliament, was unveiled today during the last session of the UFS Council for this year on the Main Campus in Bloemfontein.

The portrait, painted by the gifted artist Ms Reshada Crouse, now hangs in the Council Chambers of the UFS.

Ms Direko was sworn in as Chancellor of the UFS in August 1999. She was the first black person and first woman in this position at the UFS. She was succeeded by Dr Franklin Sonn.

“Ms Direko had an exceptional legitimacy in the black community because of her role in black education in the Free State (as principal) and community leader in the difficult ‘struggle’ period. This former principal’s simultaneous insistence on transformation as well as discipline and order at an educational institution was exactly what the UFS needed at that stage,” said Prof Frederick Fourie, Rector and Vice-Chancellor, during the unveiling ceremony.

“She also played a special role to bring the UFS and the Free State Provincial Government closer to each other. Her comprehension for the own nature of a university helped in times when difficult decisions had to be made. She also realised the value of the university’s expertise for her government. The Premier’s Economic Advisory Council, with the UFS rector and academics like Lucius Botes and James Moses in leading roles, was formed to undertake important research on economic development strategies in the Free State,” said Prof Fourie.

In her speech Ms Direko said that it is an unique experience for her to be catalogued in the history of the UFS. “I am humbled and proud to be associated with the UFS,” she said.

Ms Direko said that the UFS is on the right track with its transformation process. “I will continue to convince people that the UFS is for everyone and will fight for that until the end. But, it is important to see a visible change concerning transformation. The UFS must bring its side and speed up the transformation process. I know that it is a difficult road, but we cannot hide from the realities of our time,” she said.

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

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