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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

Graduates encouraged to use their knowledge to the benefit of SA

2017-06-28

Description: Graduation read more photo 27 June 2017 Tags: Graduation read more photo 27 June 2017

On 26 June 2017, the last day of its mid-year graduation
ceremonies, the University of the Free State conferred
388 master’s and 72 doctoral degrees.
Photo: Charl Devenish

You have the knowledge, which is a big resource, and should use it to the benefit of South Africa. This was the overwhelming message to graduates obtaining their master’s and doctoral degrees at the University of the Free State (UFS).

Their responsibility was emphasised by the likes of Justice Mahube Molemela during the ceremonies in the Callie Human Centre at the Bloemfontein Campus on 26 June 2017. Justice Molemela, Judge President of the Free State Division of the High Court and Acting Justice of the Supreme Court of South Africa, was the guest speaker at the morning and afternoon ceremonies.

The UFS conferred 388 master’s and 72 doctoral degrees on the final day of its mid-year graduation ceremonies, which was the biggest set of ceremonies in the university’s history. The doctorates came from the Faculty of Natural and Agricultural Sciences (30), Faculty of the Humanities (15), Faculty of Economic and Management Sciences (9), Faculty of Education (8), Faculty of Health Sciences (5), and Faculty of Theology (5). A total of 5 258 degrees were conferred over six days from 19 to 26 June 2017.

Future dependant on youth
Justice Molemela said the master’s and doctoral graduates have the skills to make a difference. “The future of a nation is largely dependent on its youth playing a meaningful role in creating a strong economy, culminating in a good standard of living for everyone.”

She said they should plough back into their communities and give opportunities to others. “I am certain that if each one of you thinks innovatively in your respective fields, you will find solutions which will eradicate poverty, improve service delivery, and hence our education will advance gender equity, and promote public participation.”

Dr Khotso Mokhele, UFS Chancellor, said these graduates have every reason to hold their heads high, their shoulders square, and walk with a bit of an attitude, as they have distinguished themselves.

Generation of new knowledge
According to Prof Francis Petersen, Rector and Vice-Chancellor, the UFS strives to be a university that is research led. “For me, one of the important aspects about universities which set them apart from other training and vocational institutions is the generation of new knowledge,” he said at a lunch function for PhD graduates on 26 June 2017. He feels it is critically important for them to make a contribution to the country.

Dipiloane Phutsisi, Principal and Chief Executive Officer of the Motheo TVET College in the Free State, also emphasised this. Phutsisi was the guest speaker on 23 June 2017. “Your courage and eagerness to face the future and tell the truth in the midst of this confusion, is highly desired by South Africans.”

Justice Ian van der Merwe, Judge of Appeal at the Supreme Court of Appeal and former Chair of the UFS Council, was the guest speaker at the ceremonies on 22 June 2017. He encouraged graduates from a chapter in the book War and Peace by Leo Tolstoy.

“There is no greatness where there is not simplicity, goodness, and truth (according to Tolstoy). Or maybe more modernly translated: There is no greatness where simplicity, goodness, and truth are absent.”

Click here to see a list of Deans’ and Senate medals awarded.

Graduations ceremonies:

19 June 2017:

Faculty of Education, except educational qualifications in Open and Distance Learning – South Campus
Faculty of Health Sciences, Faculty of Theology, and Faculty of Law (including the School of Financial Planning Law)

“Every one of us, is destined for greatness. In the words of Dr Martin Luther King: Everyone has the power for greatness, not for fame but greatness, because greatness is determined by service.” – Dipiloane Phutsisi (Guest speaker and Principal and Chief Executive Officer of the Motheo TVET College in the Free State)

Photo Gallery
Livestream Footage (morning session)
Livestream Footage (afternoon session)

Photo: Charl Devenish

20 June 2017:

Faculty of Natural and Agricultural Sciences: All Bachelor’s degrees
Faculty of Natural and Agricultural Sciences: All Diplomas and Bachelor Honours degrees

“Graduation marks a start of a new and wonderful journey. During the last couple of years you have not only developed your intellect, but also expanded what I call your social self,” - Prof Francis Petersen, Rector and Vice-Chancellor

Speech: Prof Francis Petersen (morning)
Speech: Prof Francis Petersen (afternoon)
Photo Gallery
Livestream Footage (morning session)
Livestream Footage (afternoon session)

Photo: Charl Devenish

21 June 2017:

Faculty of Economic and Management Sciences: All certificates, diplomas, Bachelor’s degrees, and Bachelor Honours degrees, excluding BCom degrees
Faculty of the Humanities: Social Sciences and Communication Sciences only

“Graduation is one of the most accomplished achievements one can ever experience.” – Justice Connie Mocumie (Guest speaker and Judge of Appeal at the Supreme Court of Appeal)

Photo Gallery
Livestream Footage (morning session)
Livestream Footage (afternoon session)

Photo: Charl Devenish

22 June 2017:

Faculty of Economic and Management Sciences: BCom degrees only
Faculty of the Humanities: All qualifications, except Social Sciences and Communication Sciences

“The question is not if you will make mistakes, but how do you deal with your mistakes? Do you admit them, do you learn from them, and do you grow as a person?” – Justice Ian van der Merwe (Guest speaker and Judge of Appeal at the Supreme Court of Appeal)

Photo Gallery
Livestream Footage (morning session)
Livestream Footage (afternoon session)

Photo: Johan Roux

23 June 2017:

Educational qualifications in Open and Distance Learning – South Campus

“Class of 2017, go and make your own unique contributions but remember to look into your own heart. South Africa needs your skills, your innovation, knowledge, your expertise and creativity.” – Dipiloane Phutsisi (Guest speaker and Principal and Chief Executive Officer of the Motheo TVET College in the Free State)

Photo Gallery
Livestream Footage (afternoon session)

Photo: Charl Devenish

26 June 2017:

All faculties: master’s and doctoral degrees

“Class of 2016/2017 graduates: You are critical thinkers, you can analyze, you can think independently. That is why you managed to successfully complete postgraduate degrees and diplomas.” – Justice Mahube Molemela (Judge President of the Free State Division of the High Court and Acting Justice of the Supreme Court of South Africa)

Photo Gallery
Livestream Footage (morning session)
Livestream Footage (afternoon session)

Photo: Charl Devenish

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