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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

ANC Centenary Seminar looks at the role of women in the liberation struggle

2012-03-22

At the ANC Centenary Seminar were, from the left: Nadine Lake, ProgrammeDirector: Gender Studies, at the UFS; Prof. Hassim; Zubeida Jaffer, Writer-in-Residence at the UFS; and Senovia Welman from the UFS-Sasol Library.
Photo: Amanda Tongha
22 March 2012

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“Looking back at the history of South African politics you will always find women involved in that history.”

This is according to Prof. Shireen Hassim, a professor in Political Studies at the University of the Witwatersrand, who recently spoke at an ANC Centenary Seminar, held on the Bloemfontein Campus of the University of the Free State (UFS). The seminar is part of a series of dialogues hosted by the Centre for Africa Studies about the ruling party’s 100 years of existence. It was the first one to be held following the 100 year celebrations of the ANC in January 2012 and was dedicated to the ANC Women’s League. Prof. Hassim told the audience that from early roles as wives who provided catering and entertainment, women have always been politically active in the African National Congress (ANC).

“ Women took the lead in the defiance campaign, going beyond the role of tea lady of the 1910s. When the ANC went into exile, the women’s section, as it was called then, played an important role.” Prof. Hassim also praised independent women’s organisations for the role they had played during the struggle and added that they were part of the collective history.

Talking about today’s Women’s League, Prof. Hassim said there had been debate about its current role with some critics labelling the league conservative. “In recent years, they have become very allied to internal battles.”

According to Prof. Hassim, a new language was needed that could give voice to the policies that needed to be developed.She drew attention to the plight of rural women, saying that thus far urban women have been taking the lead in defining issues. She warned that legislation like the Traditional Courts Bill would put rural women at a disadvantage. Prof. Hassim said the Bill was not rigorously debated, despite the high number of women in Parliament.

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