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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

“Deploy your education and not connections,” Chancellor tells graduates

2012-05-16

Qwaqwa Autumn Graduation
Photo: Thabo Kessah
16 May 2012

Our Qwaqwa Campus conferred 424 degrees, diplomas and certificates at this year’s autumn graduation ceremony held on 12 May 2012.

Amongst the degrees conferred were two doctorates in Polymer Science, two Master’s of Arts in Geography and African Languages, respectively, five Master’s of Science degrees in Physics (3) and Polymer Science (2) and 37 honours degrees in Education, Zoology, Physics, Botany and Polymer Science.

In their congratulatory messages, both the Vice-Rector: Institutional Affairs, Prof. Teuns Verschoor, and the Chancellor, Dr Khotso Mokhele, challenged the graduates to start focusing their attention beyond their graduation on what they both referred to as “the real world”.

“Graduation ceremonies are a fantastic event, but you must never lose sight of appreciating the support given by those around you,” said Dr Mokhele.

“This hall was full of shouting and yes, you must bask in that glory, knowing that you have achieved part of your goals. Yes, this is your moment, so shine. You deserve it. You have earned it.”

“However, this noise also means you must go out there and face the real world. You are graduating in a model country on how people can reconcile, despite their painful and divided past. You deserve all the accolades, but that model country is disappearing before your eyes. How can you mess up what Mandela, Biko, Sobukwe, Nardine Gordimer lived and fought for? How can you mess up such a good thing?” Dr Mokhele asked of an attentive audience that included proud parents and siblings, as well as educators and learners from the Thabo Mofutsanyana District.

“Go out there and deploy your education and not your connections, as these are embedded in corruption. Go out there and help get rid of the patronage system where hard-workers are more likely to be constructively dismissed as they stand in the way of those with corrupt tendencies. Save this country from becoming another Zimbabwe. Let us do whatever it takes to save this country. Let these matriculants who are here today want to walk that red carpet with pride in the next few years,”,said Dr Mokhele.

Dignitaries in attendance included the former Chief Minister of the former Qwaqwa homeland, Dr T K Mopeli; the Executive Mayor of the Dihlabeng Local Municipality, Councillor Tjhetane Mofokeng; Dr SWF Moloi (Thabo Mofutsanyana Education District) and representatives from various government departments.

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