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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.

News Archive

Food insecurity should not stand in the way of education
2015-06-11

 

Every year, hundreds of students drop out of university due to financial difficulties – only to return to dire financial circumstances. It is only a few who manage to secure a bursary to fund their studies. These bursaries often pay only for academic and residential expenses, leaving students without additional funding for food.

The University of the Free State realized that up to 60% of its students were food insecure. Many of these students admitted to having to work after class to buy food or having to beg from friends. In 2011, the UFS launched the No Student Hungry Bursary Programme (NSH), which provides modest food bursaries to food insecure students. Currently, 130 students receive food bursaries from the programme to ensure they have one less thing to worry about while they are studying.

This year, at our Autumn Graduation Ceremony, six beneficiaries of the NSH Bursary Programme, received their degrees – an achievement all them feel they could not have reached was it not for the support by NSH.

For Tshililo Nethengwe, accounting student from Venda, her first year at university in 2012 was a daily battle. Although her parents managed to pay her study and accommodation fees, the meager monthly food allowance her parents could afford was not enough to last her the month.

“Every morning I used to tell myself not to think about food because I am here to study. Somehow, I still managed to get something to eat – even if it was just a few slices of bread a day. I was very determined to succeed in my studies, and NSH took away the burden of needing to ‘hustle’ and beg for food.”

Tshililo was one of six NSH recipients who received their degrees and is now doing her honours in B.Com Accounting.

“The NSH Bursary Programme invests in potential, and supports academic achievers who come from challenging backgrounds,” explains Vicky Simpson, co-ordinator of NSH.

“We promote the success of undergraduate students, enabling them to focus on their studies and not on where their next meal will come from. Successful graduates will have a positive and direct impact on our economy, different communities, and many households.”

The NSH food bursary is awarded to students on the basis of financial need, academic excellence, and the commitment to serve the community. We have helped more than 500 students since 2011, when Prof Jonathan Jansen, Vice-Chancellor and Rector, started NSH.

“These students share amazing stories that inspire us. Many had to endure hardship, but they managed to persevere, worked hard, and made it to university. The ability to buy a meal makes an enormous difference.”

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