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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

Water Collection Campaign distributes 3 500 bottles in Free State
2016-02-19

 Description: KL News 2016 02 19 Water Tags: KL News 2016 02 19 Water
The Muslim Students Association (MSA), along with the Gift of the Givers Foundation, collected 3 500 5l bottles of water that was distributed to disadvantaged areas within the Free State. From left is Muhammed Bhamjee, President of MSA, Emily Thomas, project manager for Gift of the Givers Foundation, and Grace Jansen, one of the generous donors. Photo: Charl Devenish.

The Muslim Student Association (MSA) at the University of the Free State (UFS) took it upon themselves to respond to the regional water crisis being experienced in the Free State. Under the leadership of Muhammed Bhamjee, President of MSA, the association started an initiative to collect water for the purpose of distributing it to disadvantaged areas within the Free State.

The drive started out as just a humble request within the student community, but it gained a great deal of attention from staff, departments, and students from the UFS. The response was overwhelming; 3 500 5l bottles of water were donated.

Amongst the donors were the Student Affairs department and Grace Jansen, wife of Prof Jonathan Jansen, Vice-Chancellor and Rector of the UFS. Mrs Jansen said it was important for her to make a contribution: “Even though we are receiving, we need to give as well. Wherever there is a need, we need to be involved.” She believes the project has the ability to grow and gain more attention and support. She believes it needs to grow across communities to solve such problems together.

Bhamjee explains that the MSA has had a relationship with Gift of the Givers Foundation, as they have been running the campaign for quite some time. “We just felt that it’s our responsibility to get involved. Even with the little we can do, every bit counts at the end of the day.” He added that there is also a need to support fellow students at the UFS Qwaqwa Campus.

Emily Thomas, project manager for Gift of the Givers Foundation, applauds the MSA initiative, and encourages students to continue collaborating with the foundation to assist with disaster situations.

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