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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

Dr Khotso Mokhele joins ranks of distinguished Chancellors

2010-11-21

Attending the inauguration ceremony are, from the left: Mr Pule Makgoe, MEC for Education in the Free State and member of the UFS Council; Judge Ian van der Merwe, Chairperson of the UFS Council; Dr Khotso Mokhele, newly inaugurated Chancellor of the UFS; and Prof. Jonathan Jansen, Vice-Chancellor and Rector of the UFS.
Photo: Dries Myburgh

Dr Khotso Mokhele joined the ranks of distinguished Chancellors of the University of the Free State (UFS) with his inauguration as the new Chancellor of the institution at a ceremony on Friday, 19 November 2010.

The lustrous ceremony took place on the Main Campus in Bloemfontein and was attended by hundreds of guests from all over South Africa.

Dr Mokhele said in his speech: “I am excited to have been invited by the UFS to join its community at the time when it is attempting to reinvent itself into an institution that will be counted amongst those that will shape the local, regional, national will, and by so doing, contribute to the shaping of an African will.”

Dr Mokhele follows in the footsteps of Dr Franklin Sonn, former Ambassador of South Africa in the United States of America and receiver of many awards, acknowledgements, and honorary doctorates, who retired earlier this year. Dr Sonn was preceded by Ms Winkie Direko, former premier of the Free State.

His acceptance of the role of Chancellor is a great honour for the UFS.

According to Prof. Jonathan Jansen, Vice-Chancellor and Rector of the UFS, it is a proud moment to welcome someone from the Province as the Chancellor of this university. With his strong academic values and deep sense of human compassion, Dr Mokhele is one of but a few uncompromising leaders. He is also an inspiring, determined pioneer and a role model to all our students.

Few have done as much to guide the development of science in South Africa since democracy in 1994 as Dr Mokhele. His vision and actions as a senior science manager have been guided by his deep conviction that for a truly democratic society to emerge in South Africa all people must be empowered to be its architects and must have unhindered access to those careers upon which our economy is built.

Dr Khotso Mokhele was born and raised in Bloemfontein. After matriculating from the Moroka High School he went on to study at Fort Hare, where he graduated with a B.Sc. in Agriculture, winning the Massey-Ferguson award for the best student in that field. As a recipient of the prestigious Fulbright-Hays Scholarship, he entered the University of California in Davis where he took a M.Sc. and a Ph.D. degree, both in Microbiology. He was awarded post-doctoral fellowships at the Johns Hopkins University School of Medicine in Baltimore, Maryland, and at the University of Pennsylvania, Philadelphia.

Dr Mokhele returned to South Africa in 1987, set on becoming a top-class academic and researcher. He held lecturing posts at the Universities of Fort Hare (1987-1989) and Cape Town (1990-1992). In 1992 he joined the Foundation for Research Development (FRD) as one of its Vice-Presidents. He succeeded to its presidency in 1996 and then from 1999 to 2006 became the first President of the National Research Foundation (NRF). He successfully merged the FRD and the Centre for Science Development of the Human Sciences Research Council. Under his visionary leadership the NRF has come to play a pivotal role in the development agenda of the country. He was also instrumental in the establishment of the South African Academy of Sciences serving as its founder president (1996-1998).

Dr Khotso Mokhele's contribution to science in South Africa has received wide recognition locally and abroad. He has received nine honorary doctorates. He was made a Chevalier of the Legion of Honour by the President of France in recognition of his personal efforts in strengthening scientific ties between France and South Africa, and was appointed a director of the Salzburg Seminar, an institution focused on global change, and subsequently a member of its Council of Senior Fellows.

He also serves on the boards of major companies such as Implats, Adcock Ingram and Afrox.

Complete speech (Pdf)

Media Release
Issued by: Lacea Loader
Director: Strategic Communication (actg)
Tel: 051 401 2584
Cell: 083 645 2454
E-mail: loaderl@ufs.ac.za19 November 2010

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