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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

Meet the person behind the new #FaceOfFacebook

2016-05-19

Reuben “R” Davids

The votes have been counted, and we have a winner! After much excitement and a fairly close contest, Reuben “R” Davids emerged victorious from the top five contestants selected by our panel of judges. We chatted with the vibrant and enthusiastic Mr Davids to get a sense of the person who will be our Facebook ambassador for the next year.

What does the “R” stand for?

“Interestingly, some also know me as Vuyo. It's not a name on my birth certificate or anything; I just really like it. And I also coincidentally found out that it means “joy/happiness”, and I do enjoy being happy.”

What is your field of study, and how far along are you?

“I am pursuing a career in the economics field as a third-year BCom Accounting student in the Faculty of Economic and Management Sciences here at the University of the Free State.”

Are you originally from Bloemfontein?

“Yes, born and bred. I've been a Bloem Kid since day one.”

How is it that you ended up here, studying at the UFS?

“The UFS has always been one of my favourite universities. During my high school period, I was constantly exposed to people from my neighbourhood as well as schoolmates who performing excellently here at UFS, and it didn't go unnoticed. So I have always been drawn to the prestige that UFS carries.”

Which residence are you in, and what do you enjoy most about res life?

“I currently stay at home with the family, but for my first 2 years of study I resided at ConLaurês. What I enjoyed the most about res life is the freedom and independence that you get. It also enables one to participate in campus life much easier. It actually helps one grow and mature into the adult you're supposed to become with all the challenges and responsibilities that you're faced with.”

What do you hope to accomplish during your term as the #FaceOfFacebook?

“I enjoy the art of presenting (as well as being an MC), and being the #FaceOfFacebook will enable me to exercise that skill. Also, my interaction skills will be exercised. That being said, I would like to have those skills developed further by the end of my term as #FaceOfFacebook.”

What is your motivation in your studies, in taking part in this contest, and in life?

“I am an adrenaline junkie. I like taking on challenge; so what I normally do is I set a certain goal for myself and then take on the challenge to achieve that goal. That's my number one motivating factor. And I think I'm also inspired by the failures and successes of myself and of those around me.”

Reuben has already been featured in a #PeopleOfKovsies post on Facebook, and appeared in his first Facebook video covering the Open Day on our Bloemfontein Campus.

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