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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

UFS celebrates Africa Month
2017-05-24

 Description: ' Africa Month Tags: UFS celebrates Africa Month

Most of the international students at the UFS come from
the Southern African Development Community (SADC)
and other countries in Africa.

Photo: iStock

“Africa Month provides an opportunity
to every student and staff member to
commemorate African unity and celebrate
our rich cultural heritage, diversity,
energy and social dynamism.”

The University of the Free State (UFS) celebrates Africa Month to commemorate African unity and praise cultural heritage, as well as to take ownership of the future of the continent. According to Prof Heidi Hudson, Director of the Centre for Africa Studies, these are reasons to take part in the festivities.

Formation of Organisation of African Unity

Africa Day is the day on which Africa observes the creation of the Organisation of African Unity (OAU) on 25 May 1963. A total of 32 independent African states attended the formation.

The OAU’s aims were to promote unity and solidarity of the African states and act as a collective voice for the continent, in order to secure Africa’s long-term economic and political future and to rid it of remaining forms of colonialism. The OAU later gave birth to the African Union, which formally replaced the OAU in July 2002.

Prof Hudson says celebrating Africa Month forms part of her centre’s institutional mandate to promote an African focus in research, teaching, as well as public debate.

“Africa Month provides an opportunity to every student and staff member to commemorate African unity and celebrate our rich cultural heritage, diversity, energy and social dynamism. Secondly, by participating we all begin to take ownership of our future on this continent.”

She adds that Africa month provides a platform for reflecting on past experiences and achievements, as well as to critically assess the failures, challenges and the lessons learnt for the sake of a better future for the continent’s people.

Working relations across the continent

The UFS has working relations with universities, embassies and consulates in African countries such as Zimbabwe, Mozambique, Botswana, Zambia, Kenya, Namibia, Nigeria, Ghana, Uganda, and Tunisia.

Five cooperation agreements exist – they are with the Botho University (Botswana), Greater Zimbabwe University, Universidad Eduardo Mondlane (Mozambique), Trinity Theological Seminary Ghana, and Namibia Evangelical Theological Seminary.

According to Kanego Mokgosi, Senior Officer at Internationalisation, there are also working relations between the university and The Council for the Development of Social Science Research in Africa, Swedish International Development Agency and The United Nations Educational, Scientific and Cultural Organization. All of these focus on research development in Africa.

Most of the international students at the UFS come from the Southern African Development Community (SADC) and the continent. It hosts 1393 students from SADC countries.

“The UFS employs SADC protocol guidelines which, among others, enjoin SADC universities to admit at least 5% of their student population from the SADC region,” says Mokgosi.

Memorial Lecture by Dr Zeleza

On 24 May 2017 the Centre for Africa Studies hosted an Africa Day Memorial Lecture by Dr Paul Tiyambe Zeleza, the Vice Chancellor (President) of the United States International University Africa, Nairobi, Kenya.

The UFS library, in collaboration with the Department of English and the Office of International Affairs, also celebrated Africa Day on 25 May 2017. They hosted a conversation on the Land Debate in South Africa, together with the launch of a book titled White Narratives: The depiction of Post-2000 Land Invasions in Zimbabwe by Prof Irikidzayi Manase. He is an Associate Professor in the Department of English.

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