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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

Researchers urged to re-emphasise regeneration of grassroots
2013-10-23

23 October 2013

Institutions of higher learning have a critical role to play in the promotion and protection of indigenous knowledge systems. This is according to Dr Mogomme Masoga, UFS alumnus and Senior Researcher with the Development Bank of Southern Africa (DBSA).

Dr Masoga was addressing the 6th annual Indigenous Knowledge Systems (IKS) Symposium at the University of the Free State’s Qwaqwa Campus.

“The time has come for local communities rich with knowledge to be taken seriously by the researchers doing their work in those respective communities,” argued Dr Masoga.

“Power relations between the researcher and the communities involved in the research process should be clarified. The same applies to the ownership and control of knowledge generated and documented in a community.

“There is an increasing need for democratic and participatory development in our communities. This can be achieved by giving primacy to the interests, values and aspirations of the people at large. There must be a radical move from prevailing paradigm of development that suffers from relying on coercion and authoritarianism. There is a need to associate development with social needs. This will give validity and integrity to the local communities, thereby giving confidence to the leaders and their constituencies.”

Dr Masoga said that the time has come for African universities in particular to “de-emphasise factors that monopolise attention today. Factors like debt crisis, commodity prices and foreign investment, among others, must be replaced by emphasis on the regeneration of the grassroots. Many African universities and research institutions have not lived up to their responsibilities as guiding lights to the continent. However, all is not lost.

“The current global race for knowledge works against so-called developing countries, especially in Africa. There is a far greater need to have a code of ethics drawn up for researchers engaging with local communities, to ensure the promotion and protection of indigenous knowledge systems.”

Meanwhile, a cross-section of papers were also delivered during the symposium. These ranged from Moshoeshoe’s lessons in dealing with poverty alleviation as presented by Dr Samuel Mensah, Department of Economics, to indigenous grasses of Qwaqwa by Prof Rodney Moffett, Department of Plant Sciences. Also presenting lectures were Phephani Gumbi, African Languages; Tshele Moloi, School of Mathematics; Natural Sciences and Technology Education and Dr Tom Ashafa (Plant Sciences).

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