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Rust diseases remain a serious threat to food crops in South Africa

07 August 2025 | Story Martinette Brits | Photo Stephen Collett

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

Alumni in the financial sector: money talks!

2016-12-26

Marina Marinkov, Economist at the
International Monetary

Evangelina Nailenge, General
Manager: Investment Institutions at
Namibia Financial Supervisory Authority.

Vuyelwa Vumendlini, Chief Director:
Global and Emerging Markets, National
Treasury.

Prof Meshach Azaikpono, Professor of
Development Finance, University of
Stellenbosch.

Anton Nicolaisen, Provincial Head for
the Free State Province, Standard Bank.

Where are they now?

On good days, most of us battle to set our personal finances straight, let alone be responsible for a large enterprise. So we are extremely proud of the well-trained and talented Kovsie alumni who fill prominent shoes. Operating mostly away from the public eye, they make decisions to improve the economy on various levels. It is heartening to know that the UFS contributes to financial matters and training all across the globe.

Marina Marinkov

Courses: BCom (Economics), BCom Hons (Money and Banking), and MCom (Economics) (2000-2004)
Current position: Economist at the International Monetary Fund
Biggest career obstacle: I once worked for an organisation with poor leadership which negatively affected employee morale and job performance. It still proved to be a great learning experience, though. Bad bosses can teach us powerful lessons.
Best career advice: Stop doubting yourself, work hard and be humble.
Fondest memory of UFS: Time spent on campus with my classmates, whether studying for finals at the library or just catching up between classes. The UFS was also my first employer and I have plenty of wonderful memories with colleagues at the Department of Economics.

Evangelina Nailenge

Courses: BCom Hons (Money and Banking) MCom (Money and Banking) (2005-2006)
Current position: General Manager: Investment Institutions at Namibia Financial Supervisory Authority
Biggest career obstacle: At times, being one of the youngest requires you to work twice as hard to earn your voice and cue at the decision-making table.
Best career advice: “Whatever your hand finds to do, do it with all your might, for in the realm of the dead, where you are going, there is neither working nor planning nor knowledge nor wisdom.” Eccl. 9:10
Fondest memory of UFS: Walking around the campus. Its well-manicured lawns and gardens had a calming effect in the midst of academic pressures. I will forever treasure the moment I first saw my name engraved in the walls of FGG, as the best postgraduate student for both 2005 and 2006.

Vuyelwa Vumendlini

Course: BCom Hons (Economics) (1996-1999)
Current position: Chief Director: Global and Emerging Markets, National Treasury
Biggest career obstacle: Doubting your own capabilities.
Best career advice: The sky is the limit, go for it all out, but most importantly, do something that you are passionate about it. It makes your work much more meaningful.
Fondest memory of UFS: Working as a tutor in my honours year and being able to help other students. I also enjoyed hanging out at Mooimeisiesfontein on Saturday afternoons.

Prof Meshach Azaikpono

Course: PhD in Economics (2004-2008) “The Depth of Financial Integration and its Effects on Financial Development and Economic Performance of the Southern African Customs Union Countries”. He received the Founders’ Medal for the best PhD dissertation in Economics in South Africa.
Current position: Professor of Development Finance, University of Stellenbosch.
Biggest career obstacle: I was fortunate to never have experienced a major career obstacle.
Best career advice: Pursue and focus on your passion.
Fondest memory of UFS: Being a part-time student, I had very limited interaction with the broader university environment. But I really enjoyed the support provided by the library staff and the staff from the Department of Economics. It was always like coming to see friends.

Anton Nicolaisen

Course: BEcon (1986-1989), MBA (1999-2003)
Current position: Provincial Head for the Free State Province, Standard Bank
Biggest career obstacle: Earlier in my career, I fell into a comfort zone and had to acquire the willingness to change.
Best career advice: Continuously challenge yourself to be the best possible person you can be, and run your own race. Learn through difficult times, and be open to change.
Fondest memory of UFS: Although I was not the biggest academic, I enjoyed interacting with lecturers … their stories and unique characteristics. Back then, I interpreted some as funny or awkward, only later did I realise how much I had learned from them. And of course, I’ll always remember the team spirit at athletics meetings and intervarsity.

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