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07 August 2025 | Story Martinette Brits | Photo Stephen Collett
Prof Willem Boshoff
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

Postgraduate School opens at UFS
2011-05-19

 
Prof. Maresi Nerad, from Washington university in Seattle, USA
Photo: Stephen Collett

We are celebrating the launch of our new Postgraduate School (PGS) on our Main Campus in Bloemfontein from 16 - 20 May 2011.

In line with national priorities for research-based postgraduate education and the focus of the UFS Academic Turnaround Strategy, the aims of the Postgraduate School are to:

  • improve the quality of postgraduate student research;
  • produce graduates who are global citizens, research literate and able to reflect ethically on the purpose, process and product of research;
  • improve throughput rates of postgraduate students; and
  • make the experience of being a postgraduate at the UFS one which is stimulating, enjoyable and which contributes to the development of the person beyond the limits of her or his discipline(s).

“We hope that the school will be a pleasant place to pursue research scholarship, discuss ideas and relax, and we look forward to welcoming postgraduates and other scholars to the school,” Prof. Neil Roos, Director of the UFS Postgraduate School said.

This significant event in the academic transformation of the university goes hand in hand with the inaugural lecture of Prof. Maresi Nerad. Prof. Nerad’s impressive CV reads amongst others that she has a M.A. (Political Science) at the Technical University of Darmstadt, Germany and a Ph.D. (Higher Education) at the University of California, Berkeley. She is also the founding director of the national Center for Innovation and Research Graduate Education (CIRGE).

As Professor Extraordinary in the UFS’s Postgraduate School, she is bringing more to the table than a world of wisdom and her passion for the postgraduate education. “I can contribute lessons learned from four distinct professional experiences, including 17 years of administrative and scholarly leadership in undertaking the conceptual and practical transformational work of organisational change at two US postgraduate schools, where I worked amongst others to improve the quality of mentoring, shorten the time to doctoral degree, and improve doctoral completion rates.”

She also brings to the UFS her experience as founding and current director of the first research center for studies on graduate education in the world. “It is our mission to discover how best to prepare Ph.D. students to be effective leaders in research and society,” she said.

Prof. Nerad says that she is committed to support and consult with the UFS Postgraduate School. She would particularly encourage the use of research to understand postgraduate education in all its dimensions at the UFS better and to use the evidence-based findings as a base for policy-making and resource allocation.

In reflecting on her vision for the UFS Postgraduate School, Prof. Nerad says that five years from now she hopes to see the UFS having strengthened its position as a major driving force in the national South African postgraduate-education community for internationalising postgraduate education. She is also confident that the UFS will supply increased numbers of skilled postgraduates who are “intellectual entrepreneurs and risk takers with a social consciousness, who have sustainability of the systems of the planet as a core value”.

“Five years from now the PSG will have taken the lead in preparing graduate students who are world citizens,” Prof. Nerad concluded.

 

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