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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.

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Students have a responsibility in SA, says Ntuli
2016-02-19

Description: 2016 SRC presidents Tags: 2016 SRC presidents

Lindokuhle Ntuli (left), President of the Student Representative Council (SRC) on the Bloemfontein Campus of the University of the Free State (UFS), and Paseka Sikhosana, president of the SRC on the Qwaqwa Campus, are in agreement about their vision for the UFS in 2016.
Photo: Johan Roux

You and I have a role to play in building the new South Africa built upon the Constitution of 1996.

These are the words of Lindokuhle Ntuli, President of the Student Representative Council (SRC) on the Bloemfontein Campus of the University of the Free State (UFS). They echo his and the SRC’s message of a “campus for all students, locally and internationally, irrespective of colour.”

Ntuli and Paseka Sikhosana, president of the SRC on the Qwaqwa Campus, were in agreement about their vision for the UFS in 2016.

According to Sikhosana, a well-known slogan accentuates a feeling of uniqueness at the university. “United in diversity. No wonder we say only a Kovsie knows a feeling,” he says.

“As the SRC, we believe that complete transformation on campus is through promoting a non-sexist, non-racial, but democratic student society that acknowledges diversity and change. That further promotes and embraces one student’s difference in terms of culture, tradition, religion, and sexual orientation.”

A new South Africa

Ntuli means students have a responsibility. He referred to a quotation from Frantz Fanon’s book, The Wretched of the Earth, to illustrate this. Fanon was a revolutionary and writer whose works are influential in post-colonial studies. “Every generation has a mission. It is the responsibility of every generation to discover its mission. Once you have discovered it, you have to fulfil it or betray it into relative obscurity,” Ntuli quoted.

According to him, the South African Constitution holds pious promises of a better life for all, and each citizen needs to help to achieve that.

SRC has open door policy 

Ntuli says the UFS remains committed to human embrace, diversity, integration, and human togetherness. He added that the SRC has an open door policy, and will avail itself in helping students.

According to Sikhosana, it is the objective of the SRC to represent the student community in all interactions within the university and externally.

“There is nothing for us, about us, without us students,” he says.

• The above excerpts have been taken from Ntuli and Sikhosana’s respective welcoming speeches to first-year students on the Bloemfontein and Qwaqwa Campuses.

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