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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

Regional Conference on Trafficking in Human Beings

2007-06-29

Trafficking in Human Beings:
National and International Perspectives

Date: 17th August 2007
Address: CR Swart Auditorium, University of the Free State, Bloemfontein, South Africa.

Every year thousands of children and adults become victims of trafficking and abuse in South Africa and throughout the southern African region. Victims are trafficked for a myriad of reasons: sexual exploitation, including prostitution and pornography; illegal labour, including child conscription; domestic servitude; illegal adoptions; body parts/organs; and forced marriages.

The Unit for Children’s Rights, Department of Criminal and Medical Law, University of the Free State (UFS), together with the Centre for Continuing Legal Education at UFS, will host a Regional Conference on Trafficking in Human Beings. The conference will bring together key role-players from the South African government as well as crucial international non-governmental organizations (NGOs) in the region.

Trafficking in human beings, especially women and children, is a serious violation of the human rights of the victims, as well as an extremely profitable source of income to organized crime, and needs the attention and intervention of both governmental and non-governmental institutions in South Africa.

Speakers will include representatives from the United National Office on Drugs and Crime (UNODC), the International Organization for Migration (IOM), the National Prosecuting Authority (NPA), the South African Law Reform Commission, the Unit for Children’s Rights-UFS, and NGOs Molo Songololo and Terre Des Homes, that work with child trafficking victims in South Africa and around the world.

The media are invited to report on the conference, and interview speakers and presenters Attached find programme. For more info contact the following persons.

1. Beatri Kruger - 051 401 2108 / email: krugerh.rd@mail.ufs.ac.za
2. Susan Kreston - 051 401 9562 / email: krestons.rd@mail.ufs.ac.za
3. Elizabeth Snyman – 051 401 2268 / email: snymane.rd@mail.ufs.ac.za

Programme

Trafficking in human beings:
National & international perspectives

Presented by The Unit for Children’s Rights, Department Of Criminal & Medical Law , Faculty of Law, in Conjunction with The Centre for Continuing Legal Education, University of the Free State.

Funded through the Generosity of the United States Department of State

17 AUGUST, 2007 – CR SWART AUDITORIAM

8:00-8:30 Registration & Tea
8:30-8:45 Opening & Welcome
Prof. JJ Henning, Faculty of Law
8:45-9:40 Overview & Global Perspective
Prof. Susan Kreston - Unit for Children’s Rights, Faculty of Law-UFS

9:40-10:00 TEA

10:00-10:45 International Perspectives & the Role of Organized Crime in Trafficking
Wiesje Zikkenheiner, Associate Expert
United Nations Office on Drugs & Crime, Pretoria
10:45-11:45 Identifying and Assisting Victims of Trafficking
Marija Nikolovska, Project Officer
International Organization for Migration, Pretoria

11:45-12:30 LUNCH

12:30-1:15 Prosecuting Trafficking Without Trafficking Laws
Adv. Nolwandle Qaba, Sexual Offences & Community Affairs Unit
National Prosecuting Authority, Pretoria
1:15-2:15 Recommendations for New Legislation in South Africa
Lowesa Stuurman - South African Law Reform Commission, Pretoria

2:15-2:30 TEA

2:30-2:50 The Role of Terre Des Homes in Fighting Trafficking in Children
Judith Mthombeni– Terre Des Homes, Pretoria
2:50-3:50 Trafficking in Children in South Africa – A Front Line Perspective
Patrick Solomon - Molo Songololo, Cape Town
3:50-4:00 Closing Remarks
Adv. Beatri Kruger
Department of Criminal & Medical Law - UFS

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