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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

Statement by the senior leadership of the University of the Free State
2016-02-29

Statement by the senior leadership of the University of the Free State regarding the situation on the Bloemfontein Campus 

All academic and administrative activities on the Bloemfontein and South Campuses of the University of the Free State (UFS) resume on Monday 29 February 2016.

In light of the recent incidents on the Bloemfontein Campus, the university leadership would like to address the understandable concerns of students, staff and the general public. The university obviously respects the rights of individuals to freedom of speech and expression, but notes that these rights are subject to reasonable limitation, and cannot extend to justifying criminal acts.

The Bloemfontein Campus is secure and security measures have been doubled up to ensure the safety of students, staff and public property. The court interdict is in place and will be enacted if required. Unlawful disruptions, including those involving criminal conduct, will not be tolerated.

The university strongly condemns the unlawful and unacceptable conduct by students, protesting outsourced workers, and visitors to its campus during the past week, and in particular the assault on protestors at Xerox Shimla Park on Monday 22 February 2016 during a Varsity Cup rugby match between the FNB Shimlas and FNB Madibaz. The university has started a comprehensive and independent investigation into criminal activities on this campus before, during and after the Xerox Shimla Park events.

The university regrets the destruction of public property and the intimidation of staff and students which led to the shutdown of academic and administrative activities on the Bloemfontein Campus. Extensive investigations are underway to identify the perpetrators who took part in all incidents of disruption and criminal conduct, and urgent steps will be taken against such individuals or organisations in due course.

The university leadership remains deeply concerned about a dangerous and damaging allegation that a lecturer was identified on a widely circulated photograph while assaulting a protestor at the Varsity Cup rugby match on Monday 22 February 2016. The university diligently investigated this allegation and found it to be false; the individual is NOT a member of the UFS staff. A suspect was however identified and evidence handed over to the South African Police Services (SAPS) for urgent action.

It has further come to the attention of the university management that a number of individuals and organisations continue to make blatantly false and defamatory statements on social media platforms with the intention of inciting criminal conduct, threatening individuals, and spreading fear within the university community in order to unsettle the campus. Investigations are at an advanced stage to prosecute individuals and groups involved in such criminal conduct in the social media; both those who post these statements and those who repost or retweet them, are liable under the law.

Should you wish to confirm whether there is any truth attached to a circulated rumour or allegation, please call +27(0)51 401 2911, +27(0)51 401 2634 or send an email to news@ufs.ac.za. Legal steps will be taken against individuals and organisations that persist in circulating such misleading and damaging statements.
    
The UFS urges all individuals who are in possession of evidence or knowledge of any crimes that have been committed on the Bloemfontein Campus in the past week, to come forward with such evidence and information and to call the numbers indicated above or to send an email to news@ufs.ac.za. Any individuals who are in possession of video footage and photographs of the incidents at Xerox Shimla Park, the Equitas Building (formerly known as the CR Swart Building), Thakaneng Bridge, various residences, the Main Building and the grounds in front of the building, are requested to provide such evidence in order to assist with the identification of those involved in criminal acts.

The university leadership remains committed to its duty to act in the best interests of its students and staff and calls on its community and the public to act peacefully at all times and respect the rights of others.

Issued by: Lacea Loader
(Director: Communication and Brand Management)
Email: news@ufs.ac.za

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