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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

UFS takes lead in improving quality of training in economics in schools

2006-06-20

The fourth international workshop for trainers in the National Council on Economic Education’s (NCEE) outreach programme for Africa, Latin America, Asia and the Middle East will be presented in Bloemfontein from 18-24 June 2006.

“Because of the rapid success we achieved in the Free State with similar workshops in Economics education that were presented by the NCEE the past year, we have now invited representatives from education departments and universities of five other provinces to attend the international workshop for trainers,” said Prof Klopper Oosthuizen, lecturer at the University of the Free State’s (UFS) Department of Agricultural Economics and initiator of the cooperative agreement with the NCEE.

The UFS and the Free State Department of Education are the NCEE’s first partners in Africa who received this training. “The attendance of the five provinces and universities is the first step in the extension of the programme to the rest of the country,” said Prof Oosthuizen.

The NCEE is based in the United States of America (USA) and the workshop forms part of the council’s effort to improve the quality of the training of Economics teachers and lecturers across the world.

“South Africa is urgently in need of efforts to improve the integration of black people into the market economy. An understanding of how markets work is one of the pillars of democracy. Equipping young people with economic understanding and skills will help empower them for responsible roles as individuals and citizens,” said Prof Oosthuizen.

According to Prof Oosthuizen representatives from the education departments of the Northern Cape, Western Cape, Eastern Cape, KwaZulu-Natal and North West will also be attending the international workshop for trainers. Representatives from the Universities of Rhodes, of KwaZulu-Natal, North West and the Durban University of Technology as well as the Cape Peninsula University of Technology will also attend the workshop.

During this workshop teachers and lecturers in Economics will receive certificates.

Various subjects will be covered during the workshop such as world trade patterns, cost and benefits of free trade, exchange rates and international finance. The training will be done by representatives from the NCEE by using methods such as direct instruction and role play.

The NCEE is also in the process of training teachers and learning facilitators in the Free State in an effort to improve the quality of Economics classes in secondary schools.

“A group of 84 teachers and learning facilitators were trained in December 2005, 50 were trained in January 2006 and the last group of 40 will be trained at the UFS Main Campus in Bloemfontein from 26 June - 1 July 2006,” said Prof Oosthuizen.

During this seminar the teachers will be trained in issues such as broad social goals in an economy, economic decision making, government’s role in a market economy and fiscal policy. The training will also be done by representatives from the NCEE.

The NCEE has been working together with international partners since 1992 to strengthen their Economics teaching systems. They have already succeeded in increasing literacy in Economics at schools in the USA and more than 20 East Block countries. More than 1,5 million learners in the East Block countries have already been served by this initiative. Since 2004 the NCEE’s focus has moved away from the East Block countries to Africa, Asia, Latin America and the Middle East.

“Our future plans include strengthening the growing partnership between the UFS, the Free State Department of Education and the NCEE. We also want to establish a council and centres for economic education which will serve as an umbrella for our joint efforts,” said Prof Oosthuizen.

Media release
Issued by: Lacea Loader
Media Representative
Tel: (051) 401-2584
Cell: 083 645 2454
E-mail: loaderl.stg@mail.uovs.ac.za
20 June 2006

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