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Prof Botma Visser takes on rust diseases threatening South Africa’s wheat

09 September 2025 | Story Martinette Brits | Photo Stephen Collett

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

Department of Political Studies and Governance involved in regional seminar on peace and security in Southern Africa

2012-09-26

Attending the Lusaka seminar was from the left: Prof. Hussein Solomon; Prof. Virgil Hawkins from Osaka University and main organiser of the seminar; and Prof. Theo Neethling.
26 September 2012

Two staff members from the Department of Political Studies and Governance, Prof. Hussein Solomon and Prof. Theo Neethling, were recently invited by the Osaka University in Japan to participate in a regional seminar in Lusaka, Zambia, on multinational peacekeeping and peace enforcement in Southern Africa.

The seminar was organised by the Southern African Centre for Collaboration on Peace and Security funded by the Japan Society for the Promotion of Science. Prof. Solomon presented a paper on the establishment of the Southern African contingent of the African Union’s African Standby Force, while Prof. Neethling presented his paper on United Nations peacekeeping operations in the war-ravaged eastern parts of the Democratic Republic of Congo.

The participation of Prof. Solomon, Senior Professor, and Prof. Neethling, Head of the Department of Political Studies and Governance, comes from a cooperation agreement between Osaka University’s School for International Public Policy (OSIPP) and the Faculty of Humanities at the University of the Free State. The agreement covers issues like joint collaboration projects, the exchange of staff and senior students and joint conferences. One of the key joint areas lay in the Southern African Centre for Peace and Security Studies, a consortium of several Southern African universities with Osaka University and the University of the Free State as its key pillars.

Other universities include the University of Zambia, Zambian Open University, University of Dar es Salaam, Mozambique-Tanzania Centre for Foreign Relations. Academics from other universities in the region, like Nzuzu University in Malawi, University of Botswana, University of South Africa, Stellenbosch University, University of Zimbabwe, are all in the network.

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