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09 September 2025 | Story Martinette Brits | Photo Stephen Collett
Prof Botma Visser
Prof Botma Visser delivered his inaugural lecture at the University of the Free State, highlighting nearly two decades of research on wheat rust and global food security.

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.

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Qwaqwa Campus honours academic excellence
2017-05-18

Description: QQ autumn Graduation 2017 Tags: QQ autumn Graduation 2017

Photo: Ian van Straaten

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Qwaqwa Campus kicked off the 2017 graduations season of the University of the Free State in style when over 550 degrees and certificates were conferred in three sessions on 12 and 13 May 2017. These included five PhDs from the Faculty of Natural and Agricultural Sciences.

In his maiden speech delivered during the two ceremonies on Friday 12 May 2017, the newly-appointed Vice-Chancellor and Rector, Prof Francis Petersen, emphasised the interconnectedness of graduates with other stakeholders in their communities.

“Never forget the role played by other people who sacrificed a lot for you to be here today. Recognise the extra mile that someone was willing to go for you to graduate,” he said to an enthusiastic audience that included Grade 12 learners from neighbouring schools. 

Prof Petersen also reminded the graduates that not everybody had an opportunity to enter, enrol, and eventually graduate at a university. “You are part of the privileged few, and I am confident that the UFS has given you an equal opportunity to reach your full potential. You have had years of exposure to ideas and experiences on diversity. You now have the opportunity to show the world and to use what you have learnt beyond a classroom,” he added.

“Go out there and open doors for others as much as they were opened for you. I implore you to carry over your experiences of diversity and use them to build a better world. Go out there and build a better world, not only for yourself but for everyone in need. Expand your influence, reach out, and be accountable,” he said.

“South Africa needs your skills,
innovation, knowledge, expertise,
and creativity.”

Make your own unique contribution
The session held on Saturday 13 May 2017 saw the Principal of Motheo TVET College and Qwaqwa Campus alumnus, Dipiloane Phutsisi, having a heart to heart with the graduates from the Faculty of Education.

“Our contribution to the world as graduates will not be measured by the wealth we accumulate or the accolades we receive, but rather by the way in which we share our unique gifts with the world. And the only place to find those gifts is to look within yourself. As the class of 2017, make your own unique contribution,” she said.

“Your graduation takes place at a particularly challenging time in the history of our democracy. It happens at a time when our nation is engulfed by racial polarisation, anger, confusion about what democracy and freedom mean to us, and at a time when the pillars of morality are tested.”

“As you graduate, I wish to remind you that our country needs you more than ever before. South Africa needs your skills, innovation, knowledge, expertise, and creativity,” she said.

Three members of the current SRC were also among the graduates. They are the President, Njabulo Mwali (BSc Information Technology), Sports Affairs Officer, Ntokozo Thango (BA Sociology), and Student Development and Environmental Affairs Officer, Ntokozo Masiteng (BA Sociology).

 

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