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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

Kovsie TV Launched

2015-05-06

Victor Ngubeni, Grace Thoabala, Nangamso Dlatu, Aisha Poswa, Lesego Maakamedi, Nothando Hlope, Aldene vd Merwe and Lawrence Siyoko

“We have to change our university before we can change our country.”

There is a revolution at hand, and students are requesting new and exciting platforms on which they can voice themselves. Kovsie TV aims to do just that for Kovsie students.

As a student initiative, the steam behind it is SRC Student Development and Environmental Affairs, Victor Ngubeni. He says that it is only right that it be by the students themselves. The launch saw many from the campus community gathered out of curiosity and excitement for the new venture. The evening started out as quite a classy frenzy, which had attendees clearly prepared for the level of broadcasting that the launch would showcase.

The initial idea is to increase the number of platforms where students can receive information. The Student Media portfolio, which oversees the functioning of student media platforms, aims to make Kovsie TV as autonomous as possible. As an introductory initiative, it will aid in the sharing and telling of students’ stories.

It is important to mention the preparation process that was endured by the many hopefuls who auditioned, hoping to make it as one of the Kovsie TV presenters. For more than three weeks, the panel of judges sieved through the contestants until they had just six rough diamonds. Then, for the first time, the audience met the faces that they would become familiar with from this point.

As Ngubeni stressed during his speech, Kovsie TV would not serve as propaganda machine for the SRC, as many might have asked about the relationship that could be expected between the two. The architects of Kovsie TV hope that, as a student initiative, it will inspire a new era in student activism.

When asked about the concept behind this new platform, Ngubeni informed us that, “the concept is to have a twenty-minute campus TV show highlighting what goes on around campus so that students know, and so that we can get them participating in campus life activities.”

This is a student initiative whose future will depend solely on the students themselves.

Presenters:

Nangamso Dlathu – Studio presenter

Grace Thoabala – Studio presenter

Lesego Maakamedi – Social events

Nothando Hlophe – Current affairs

Aldine van der Merwe – Culture events and Vox-Pop

Mbulelo Siyoko – Culture and Vox-Pop

Aisha Phoswa ? Sports

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