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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 withdraws interdict against SASCO and ANCYL

2003-11-25

The Rector and Vice-Chancellor of the University of the Free State, Prof Frederick Fourie, announced today that a court order against the South African Students Congress (SASCO) and the ANC Youth League (ANCYL) had been withdrawn.

The withdrawal of the court order follows after a written statement by SASCO and the ANCYL in which they “unconditionally withdraw or retract statements threatening to render the institution ungovernable” and give their “commitment not to proceed with our threats to establish our own democratic SRC and occupy the current SRC offices”.

The UFS management obtained the court order in October after SASCO and the ANCYL refused to accept the outcome of the recent student referendum and SRC elections and threatened to disrupt the campus.

Prof Fourie also welcomed the undertaking by SASCO and the ANCYL to act in accordance with the prescribed procedures to resolve any grievance that the organisations may have, saying the UFS management remains committed to a constructive dialogue with all student organisations to manage a campus of diversity, tolerance and non-racialism.

In September students voted in a referendum to test support for a system of proportional representation (PR) for the SRC. A vast majority of students voted against the PR system, a system favoured by SASCO and the ANCYL..

Following allegations of fraud in the referendum, the UFS management asked the auditing firm PriceWaterhouseCoopers to conduct an independent audit of the ballot papers.

The auditors found that a total of 180 ballot papers out of 3513 – only 5.12% - of the votes cast - appeared to have been altered by means of erasing and then changing the student number.

According to the auditors, with all potentially altered and suspicious ballot papers excluded, a huge majority of 60,8% of students voted against the proportional representation system.

A few days after the referendum, the actual SRC election was held. However, at no stage were there any complaints from any organization about the integrity of the SRC election itself.

Despite this and the findings of the auditors, SASCO and the ANCYL refused to accept the outcome.

Law student Quintin du Plessis was elected SRC president. He welcomed the stance taken by SASCO and the ANCYL to pursue their objectives through the existing structures and said the SRC was always willing to engage with these organisations on issues of student governance.

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