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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

Nigeria’s Boko Haram: Why negotiations are not an option

2014-10-23

There has been much speculation if the recently announced ceasefire in Nigeria as well as talks with Boko Haram will indeed secure the release of about 200 girls kidnapped by this religious militant group.

Talks already started between the government and Boko Haram but there are still doubts if the girls will be freed and if the Nigerian government can successfully negotiate with Boko Haram. Prof Hussein Solomon, Senior Professor at the University of the Free State, regards this current negotiations as a terrible idea.

“At a time when Boko Haram’s strength is escalating, the correlatory weakness of the Nigerian government is increasingly exposed. As Nigerians prepare for the next presidential elections, embattled President Goodluck Jonathan is increasingly desperate to negotiate with Boko Haram to secure the release of schoolgirls seized by the terrorists earlier this year and to negotiate a ceasefire. This is a terrible idea. It makes a mockery of the rule of law and of the thousands of innocent victims of the militant violence. More importantly, it will only serve to fuel the terrorists’ ambitions further as the powerlessness of the government is exposed.”

Prof Solomon says religious intolerance is on the rise on the African continent, with a concomitant rise in terrorist incidents. In Algeria, extremist terrorism carries the name of Jund al Khilafah or Caliphate Soldiers in Algeria. In Mali it is Ansar Dine or Defenders of the Faith. In Somalia it is Al Shabaab (The Youth). But none of these organisations come close to the carnage wrought by Nigeria’s Boko Haram (literally meaning Western education is forbidden).

Boko Haram has carried out more than 1 000 attacks since 2010, which has resulted in the deaths of 10 000 people and a further 6 million affected by this terrorist violence. The 300 000 Nigerian refugees who have fled this tsunami of terrorism and have sought refuge in neighbouring Cameroon, Chad and Niger, provide adequate testimony to the human costs of such terrorism. Boko Haram, meanwhile, has formed tactical alliances with Al Qaeda in the Islamic Maghreb, Al Shabaab and the Islamic State in Iraq and Syria (ISIS), which means that the groups are sharing intelligence, tactics and material support. This cooperation has also resulted in increasingly sophisticated terror attacks mounted by Boko Haram.

Read more about Prof Solomon and his research.

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