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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

Qwaqwa Campus Hosts a DSD Roadshow

2012-04-04

In front, from the left, in front: Joe Mosuhli (DSD Provincial Office), Ms Maboe Grey Magaiza (Lecturer: Sociology), Ms SM Khupane (Thibella Marakabeng Traditional Council), Mr Mbulaheni Mulaudzi (DSD). At the back, from the left: Dr Malete, Dr Elsa Crause (Departmental Head: Sociology), Chief Mahase (Phomolong Traditional Council), Mrs Sadi Luka (DSD), Chief QD Moloi (Makgolokweng Traditional Council), Chief Sekonyela (Thibella Traditional Council), Ms Mpontseng Kumeke (DSD) and Mrs Malikoankoetla Tsosane (Matsieng Traditional Council).

The National Department of Social Development (DSD) and the Free State Department of Social Development, in collaboration with the Qwaqwa Campus of the University of the Free State, hosted a road show on the professionalisation of Community Development Practice yesterday.

This inaugural road show was aimed at conceptualising and soliciting stakeholder buy-in in the new Community Development Qualification Framework, which was jointly developed by the department and the South African Qualifications Authority (SAQA). The road show also briefed stakeholders on the Recognition of Prior Learning (RPL) pilot project that will integrate the current community development workforce into the national qualification framework. Stakeholders were also briefed on the professionalisation process and were given a platform on which to talk about related issues. This included the formation of a community development association, a unified professional body and eventually, the formation of an independent statutory council.

In his welcoming remarks, Campus Principal Dr Elias Malete said that the envisaged programme of professionalising community development practice would address the local needs and bring vibrancy to affected communities. “The programme will definitely help in revitalizing our campus and the community we serve,” said Dr Malete. He was referring to the Qwaqwa Campus Revitalisation Plan. “Among the plans we have is the introduction of the four year Bachelor of Community Development degree. We are confident that our proposal will be received favourably and that we will offer this qualification from 2013,” Dr Malete said to applause from the invited guests and community members.

Talking on behalf of the provincial Department of Social Development was the department's head, Me Matlhogonolo Maboe, who emphasised the fact that large segments of communities were entirely dependent on the community development sector for their daily survival. “In professionalising the sector, we would be building vibrant rural communities and repositioning them to be better equipped in addressing what President Zuma referred to as the ‘triple challenge of unemployment, poverty and inequality’ in his State of the Nation address in February”, said Me Maboe.

Traditional leaders from the Qwaqwa area, national and provincial departmental officials as well as students and staff of the UFS attended the road show.

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