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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

Faculty of Law establishes unique panel of advisors

2005-11-11

Photo: Stephen Collett

Some of the panel members who attended the Collegium Iurisprudentium of the Faculty of Law at the UFS were from the left His Honorable Judge of Appeal Lex Mpati (Vice-President of the Supreme Court of Appeal), His Honorable Judge of Appeal Joos Hefer (former Chief Justice of South Africa), His Honorable Judge of Appeal Frits Brand (Supreme Court of Appeal) and Mrs Alet Ellis (lecturer at the UFS Faculty of Law).

At the back from left were Prof Johan Henning (Dean: Faculty of Law at the UFS), His Honorable Judge Faan Hancke (High Court of the Free State and chairperson of the UFS Council) and Adv Jannie Lubbe Sc.

The Faculty of Law at the University of the Free State (UFS) has established a panel of advisors comprising of all the honorary and extraordinary professors of the faculty.

“The faculty has been known for its excellent practice-orientated training as well as the involvement of law practitioners in the training of LL B-students,” said Prof Johan Henning, Dean of the Faculty of Law at the UFS.

“The faculty was greatly dependent on the services of advocate lecturers, full-time members of the Bar and Side Bar who lectured on a part-time basis at the faculty. For this reason lecturing in the faculty was mainly done after-hours to part-time students,” said Prof Henning.

With the shift in emphasis to full-time lecturing and the appointment of full-time lecturers, especially because of the increasing student numbers, the full-time LL B-programme and the increasing pressure on students for quality research inputs, a greater need for meaningful contributions of judges and senior law practitioners to the faculty was experienced.

“To comply with this urgent need, three honorary professors and nine extraordinary professors were appointed. This group of experts deliver an indispensable contribution to the practice orientation of the faculty by means of formal lectures, public inaugural lectures and guest lectures, direct lectures to graduate and post-graduate students, participation in research projects and the constant evaluation of lecturers, modules and the content of modules and learning material. The international exposure of students and lecturers is also promoted by their contribution,” said Prof Henning.
“A need to have the involvement of this special class of professors structured in a more organised way was identified and a decision was made to establish an advisory panel called Collegium Iurisprudentium. It is a privilege to us that all the honorary and extraordinary professors accepted the invitation,” said Prof Henning.

The panel will provide the faculty with continuous, distinguished, practice- orientated capability and capacity as well as international expertise, not only for direct inputs to students but also to advise lecturers about the curriculum, the compilation of the content of the LL B and M module, learning material and others, as well as to strengthen the research capacity of the faculty.

“The panel will also deliver a decisive contribution to the faculty’s preparation for the constitutional audit of the Higher Education Quality Committee (HEQC) of the Council for Higher Education (CHE) that will take place in October 2006,” said Prof Henning.

The Collegium Iurisprudentium, which has been formally constituted, comprises of:

Appeal Court Judge J J F Hefer,
Appeal Court Judge L Mpati
Appeal Court Judge F D J Brand
Appeal Court Judge I G Farlam
Prof B A K Rider
Judge S P B Hancke
Judge A Kruger
Judge D H van Zyl
Adv S J Naudé
Adv J Lubbe Sc
Prof M M Katz
Prof R J Cook
Mr S van de Merwe
Mr W van der Westhuizen
Mr D C M Gihwala

Media release
Issued by:Lacea Loader
Media Representative
Tel: (051) 401-2584
Cell: 083 645 2454
E-mail: loaderl.stg@mail.uovs.ac.za
11 November 2005

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