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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

Active citizenship key to building healthier communities
2014-09-22

Photo: Mamosa Makaya

The Office of Community Engagement in collaboration with Bloem Shelter, hosted a three-day Indaba on active citizenship. The focus of the event was to engage local government leaders, NGOs and social services groups on creating a society that is healthier, safer and more informed.

The over-arching theme of the Indaba centred on the strengthening of family structures, social and health service delivery, spiritual healing and counselling. Amongst the various speakers was Rev Jennifer Samdaan, Minister in the Methodist Church and community activist. During her presentation, ‘Youth, Women and Children at Risk in South Africa', she highlighted the challenges that women and youth in townships and rural areas deal with in their daily lives. One example is physical and sexual violence while commuting to school and work. Rev Samdaan’s organisation has been instrumental in engaging municipal authorities in the region of Kokstad to provide security and lighting on roads where women are most vulnerable to violent attacks as they commute from work.

Community workers discussed their contributions in the fields of marital and family counselling and mental health support services. They discussed the benefits of their collaboration with local judicial bodies and other community leaders to render services to victims of domestic violence.

Rev Billyboy Ramahlele, Director in the Office of Community Engagement, emphasised the role of leadership and the responsibility of political leaders and citizens alike to ensure accountability in the quest to build a healthier society.

Vanessa Booysen, a neonatal consultant for Newborn Care in South Africa, demonstrated the importance of bonding between mothers and their babies. She called attention to the negative effects on the development of babies when separated from their mothers and the future challenges this causes. Modern medicine also leads to fewer women giving birth naturally. Booysen stressed that "it matters how we are born". She encouraged health practitioners to go back to basics in maternal care to lessen the negative effects that pass onto children into adulthood.

The workshop concluded with an exhibition by various groups that showcased the information resources and services offered to communities in the Free State.

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