Latest News Archive

Please select Category, Year, and then Month to display items
Previous Archive
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

Trevor Manuel and Max du Preez among the recipients of honorary doctorates at UFS graduation
2016-07-02

Description: 4 Hon Docs Tags: 4 Hon Docs

The UFS awarded four honorary doctorates
at its Winter Graduation ceremonies.
The recipients are from left Max du Preez,
Dr Reuel Jethro Khoza, Prof Joel Samoff
and Trevor Manuel at the UFS Chancellor’s
Dinner on 30 June 2016.

Photo: Johan Roux

He is excited about the young minds he saw and interacted with at the graduation ceremony of the University of the Free State (UFS). This is what Max du Preez, one of South Africa’s leading journalists and political analysts, said after receiving an honorary doctorate.

According to Du Preez (Humanities), he was inspired by the Winter Graduation ceremony on 30 June 2016 in the Callie Human Centre on the Bloemfontein Campus. He is happy to finally also call the UFS his alma mater. He grew up in Kroonstad and is a true Free Stater, but previously graduated at the Stellenbosch University.

The UFS awarded four honorary doctorates – the others to Prof Joel Samoff (Humanities), Trevor Manuel and Dr Reuel Jethro Khoza (both Economic and Management Sciences) – and two Chancellor’s medals at the morning ceremony on 30 June 2016. Chancellor’s medals were awarded to Antony Osler and Marguerite van der Merwe (née Osler).

Manuel impressed by amount of soul

At the Chancellor’s Dinner, which was held in the Centenary Complex on the Bloemfontein Campus on 30 June 2016, Du Preez said he feels honoured. He said South Africans must embrace the diversity of the country, and the UFS is a good example. “If the University of the Free State can make it, South Africa can make it.”

Manuel, a former South African Finance Minister, said he is honoured by the amount of soul he experienced from Dr Khotso Mokhele, UFS Chancellor, and Prof Jonathan Jansen, Vice-Chancellor and Rector of the UFS. “We cannot tolerate what is wrong (in the country) and need to push the boundaries of what is right,” he said.

UFS stands out regarding understanding


Dr Khoza, a distinguished thinker and businessman, also thanked the UFS at the Chancellor’s Dinner. “We shall strive to be known less for what we say, but rather more for what we do,” he said about the country.
According to Prof Samoff, Professor in Africa Studies at Stanford University (USA), “South Africa has committed itself to building a democratic, non-racist, and non-sexist society”. “Where the University of the Free State stands out, is in its understanding that societal change – ‘transformation’, to use the current terminology – is not an outcome, but a process. A difficult process.”

 

Media Enquiries

Contact person: Lacea Loader (Director: Communication and Brand Management)
Tel: +27(0)51 401 3422/2707 or +27(0)83 645 2454
Email: news@ufs.ac.za | loaderl@ufs.ac.za
Fax: +27(0)51 444 6393

We use cookies to make interactions with our websites and services easy and meaningful. To better understand how they are used, read more about the UFS cookie policy. By continuing to use this site you are giving us your consent to do this.

Accept