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Rust diseases remain a serious threat to food crops in South Africa

07 August 2025 | Story Martinette Brits | Photo Stephen Collett

Prof Willem Boshoff shares insights from decades of rust disease research during his inaugural lecture at the University of the Free State.

Rust diseases of food crops remain one of agriculture’s most enduring and evolving challenges. In his inaugural lecture on 23 July 2025 at the University of the Free State (UFS), Prof Willem Boshoff shared how these complex pathogens continue to pose a significant threat to South Africa’s staple crops – and why continued research is more critical than ever.

Titled Battling rust diseases of food crops in South Africa, the lecture reflected on decades of rust research and recent developments in pathogen virulence. Prof Boshoff, from the Department of Plant Sciences, emphasised that the threat posed by rust fungi today stems from their “mechanisms of variability, their ease of long-distance spore dispersal, and subsequent foreign race incursions”.

A shifting disease landscape

Rust fungi are biotrophic organisms that cannot be cultured on artificial growth media. This makes rust research a technically demanding field that requires living pathogen collections, seed sources, skilled researchers, and specialised infrastructure. Prof Boshoff noted that for more than 35 years, the UFS has been at the forefront of this work, monitoring rust pathogens on wheat, barley, oats, maize, and sunflower.

While wheat remains the most extensively studied type, recent rust outbreaks across a range of crops point to a worrying trend. A localised outbreak of stem rust on spring wheat in the Western Cape has been linked to race BFGSF, which carries a previously unknown combination of virulence genes affecting both wheat and triticale. In 2021, leaf rust race CNPSK was detected, showing virulence to the highly effective Lr9 resistance gene.

More recently, stripe rust race 142E30A+ – first reported in Zimbabwe – was found in wheat cultivars from the Free State and northern irrigation areas. “Results revealed increased susceptibility of especially spring irrigation wheat cultivars,” Prof Boshoff explained, particularly due to its virulence to the Yr9 and Yr27 resistance genes.

Rust pathogens affecting other crops are also evolving. In maize, only a few lines with mostly stacked resistance gene combinations were effective against all tested isolates. In sunflower, just four of 30 Agricultural Research Council national trial hybrids showed resistance to local rust races.

Building better resistance

A key strategy in rust control lies in identifying and understanding resistance in host plants. This, Prof Boshoff stressed, requires optimised phenotyping systems for both greenhouse and field conditions, along with a solid understanding of available resistance sources. At the UFS, several recent studies have contributed valuable data to both local and international plant breeding programmes.

“Continued local and regional rust research is critical,” he said. “It supports early detection of new races, alerts to producers through updated cultivar responses, and enables efficient breeding strategies and other sustainable methods of rust management.”

The rust programme at the UFS has not only supported varietal release and on-farm risk management, but also strengthened collaboration between plant scientists, industry partners, and international researchers. With South Africa’s strategic location and history of rust surveillance, the programme continues to play a pivotal role in continental and global food security efforts.

About Prof Willem Boshoff

Prof Willem Boshoff is a plant pathologist with a strong background in wheat breeding and rust disease control. He holds four degrees from the University of the Free State, all awarded cum laude: a BScAgric (1994), BScAgric Honours (1995), MScAgric (1997), and PhDAgric (2001). His doctoral research focused on the control of foliar rusts in wheat.

Between 2001 and 2016, he worked as a wheat breeder and contributed to the release of several commercial cultivars. He joined the UFS Department of Plant Sciences in 2017 and has since been actively involved in national and international research projects, capacity development, and advancing disease resistance in food crops.

News Archive

Enhancement of social justice focus at research colloquium

2010-10-07

At the third Education for Social Justice Research Colloquium the publication Praxis towards sustainable empowering learning environments in South were handed to Prof. Ezekiel Moraka, Vice-Rector: External Relations at the UFS. At this occasion were, from the left: Prof. Dennis Francis, Dean of the UFS Faculty of Education; Prof. Sechaba Mahlomaholo, Research Professor in the Faculty of Education Sciences at the North-West University; Prof. Moraka; and Dr Milton Nkoane, Senior Lecturer in the UFS Faculty of Education.
Photo: Leonie Bolleurs

This year, the University of the Free State (UFS) was the host for the Research Colloquium: Education for Social Justice for the very first time. It is the third time that this colloquium has been presented.

Prof. Ezekiel Moraka, Vice-Rector: External Relations at the UFS, opened the colloquium, stating that academics, through their research, are ultimately in a good standing to advise government on important issues such as social justice for them to address these issues accordingly.

Prof. Sechaba Mahlomaholo, Research Professor in the Faculty of Education Sciences at the North-West University, delivered the opening address on the theme: Validating community cultural wealth towards sustainable empowering learning environments for social justice. He said that the legacy of our recent past as South Africa still continues to haunt us, especially as exemplified in the dysfunctionalities that are rife in our education.

“With the colloquium we manage to bring together the ideas, thoughts, resources and efforts of educators and/or educationists concerned with the creation of a more equitable, equal, free, hopeful, peaceful and socially just society. Through our teaching, our community engagement and research activities we strive towards a more humane, caring, respecting and respectful South Africa and the world,” he said.

According to Prof. Mahlomaholo, education and its research are some of the most potent mechanisms at the very centre of social transformation. The papers at the colloquium focused on investigating, understanding and responding to issues of amongst others:

The medium of teaching and learning which continues to be a barrier to many learners to perform to the best of their abilities in the majority of the education institutions in South Africa;
Health, sexuality, HIV/Aids, stigmatisation and other deseases plaguing our communities currently;
Self-fulfilling prophecies and stereotypes about some learners not being as intelligent as the rest and this finally being reflected and confirmed in their poor academic achievements;
Differentiated levels of parental involvement in the activities of their children’s learning due to long absences from their families as they have to work in far-off places of employment;

Papers delivered at the colloquium moved beyond merely identifying the problems; they also suggested possible and plausible research-based solutions to these, such as integrating HIV/Aids education in curricula, listening to the aspirations of significant stakeholders such as mothers and parents generally in teaching and facilitating more rigorous community engagement practices.

At the colloquium gala dinner the book Praxis towards sustainable empowering learning environments in South Africa by authors Dr Milton Nkoane, Senior Lecturer in the UFS Faculty of Education, Prof. Mahlomaholo and Prof. Dennis Francis, Dean of the Faculty of Education at the UFS, was launched. The publication consists of a collection of the best peer-reviewed papers from a conference with the theme Creating sustainable empowering learning environments through scholarship of engagement. The main criterion for inclusion was that the paper should contribute to the theme by means of an original, tight, theoretical and empirical study conducted with the aim of informing the practice of creating sustainable empowering learning environments. The concrete cases examined in many of the chapters are very useful to helping readers understand the specific, on-the-ground concerns related to higher education and schools.

Media Release
Issued by: Leonie Bolleurs
Strategic Communication
Tel: 051 401 2707
Sel: 0836455853
Email: bolleursl@ufs.ac.za
30 September 2010

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