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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

UFS researcher selected as emerging voice
2016-11-03

Description: Andre Janse van Rensburg  Tags: Andre Janse van Rensburg

André Janse van Rensburg, researcher at the
Centre for Health Systems Research and Development
at the University of the Free State, will be spending
almost three weeks in Vancouver, Canada. He will be
attending the Emerging Voices for Global Health programme
and Global Symposium on Health Systems Research.
Photo: Jóhann Thormählen

His research on the implementation of the Integrated School Health Programme (ISHP) in rural South Africa led to André Janse van Rensburg being selected to become part of the Emerging Voices for Global Health (EV4GH) group.

It is a collection of young, promising health policy and systems researchers, decision-makers and other health system professionals. A total of 222 applications from 50 countries were received for this programme, from 3-19 November 2016 in Vancouver, Canada.

The EV4GH is linked to the fourth Global Symposium on Health Systems Research (HSR2016), from 14-18 November 2016. It also taking place in Vancouver and Janse van Rensburg will be taking part, thanks to his research on the ISHP in the Maluti-a-Phofung area. He is a researcher at the Centre for Health Systems Research & Development (CHSR&D) at the University of the Free State (UFS).

The theme of the HSR2016 is Resilient and Responsive Health Systems for a Changing World. It is organised every two years by Health Systems Global to bring together roleplayers involved in health systems and policy research and practice.

Janse van Rensburg also part of Health Systems Global network
The EV4GH goals relate to the strengthening of global health systems and policies, particularly from the Global South (low-to-middle income countries with chronic health system challenges). The initiative involves workshops, presentations, and interactive discussions related to global health problems and solutions.

As an EV4GH alumni, Janse van Rensburg will become part of the Health Systems Global network. Partnering institutions include public health institutes from China, India, South Africa, Belgium, and the UK.

“The EV4GH is for young, promising health
policy and systems researchers, decision-makers
and other health system professionals.”

Research aims to explore implementation of schools health programme
In 2012, the ISHP was introduced in South Africa. This policy forms part of the government's Primary Health Care Re-engineering Programme and is designed to offer a comprehensive and integrated package of health services to all pupils across all educational phases.

Janse van Rensburg, along with Dr Asta Rau, Director of the CHSR&D, aimed to explore and describe implementation of the ISHP. The goals were to assess the capacity and resources available for implementation, identify barriers that hamper implementation, detect enabling factors and successful aspects of implementation and disseminate best practices in, and barriers to, ISPH implementation with recommendations to policymakers, managers and practitioners.

“A lot of people were saying they don’t
have enough resources to adequately
implement the policy as it is supposed to
be implemented.”

Findings of project in Maluti-a-Phofung area
Janse van Rensburg said the ISHP had various strengths. “People were impressed with the integrated nature of the policy and the way people collaborated across disciplines and departments. The school team were found to work very well with the schools and gel well with the educators and principles.”

He said the main weakness of the implementation was resources. “A lot of people were saying they don’t have enough resources to adequately implement the policy as it is supposed to be implemented.

“Another drawback is the referral, because once you identify a problem with a child, the child needs to be referred to a hospital or clinic.” He means once a child gets referred, there is no way of knowing whether the child has been helped and in many cases there is no specialist at the hospital.

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