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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 staff get salary increase of at least 7,25%

2007-11-20

During the signing of the UFS's salary agreement were, from the left: Mr Olehile Moeng (Chairperson of NEHAWU), Prof. Frederick Fourie (Rector and Vice-Chancellor of the UFS), and Prof. Johan Grobbelaar (Chairperson of UVPERSU and spokesperson of the Joint Union Forum).

UFS staff get salary increase of at least 7,25%

The University of the Free State’s (UFS) management and trade unions have agreed on an increase of 9,32% in the service benefits of staff for 2008. This includes a general minimum salary increase of 7,25%.

A once-off non-pensionable bonus of R3 000 will be paid in December 2007.

The agreement was signed today by representatives of the UFS management and the trade unions, UVPERSU and NEHAWU.

“As the state subsidy level is unfortunately not yet known, remuneration could vary several percentage points between a window of 7,25 and 8,39%,” said Prof. Frederick Fourie, Rector and Vice-Chancellor of the UFS.

Should the government subsidy be such that the increase falls outside the window of 8,39%, the parties will negotiate again.

The bonus will be paid to staff members who were employed by the UFS on UFS conditions of service on 14 November 2007 and who assumed duties before 1 October 2007.

The bonus is payable in December 2007 in recognition of the role played by staff during the year to promote the UFS as a university of excellence and as confirmation of the role and effectiveness of the remuneration model.

“It is important to note that this bonus can be paid due to the favourable financial outcome of 2007,” said Prof. Fourie.

“Our intention is to pass the maximum benefit possible on to staff without exceeding the limits of financial sustainability of the institution. For this reason, the negotiating parties reaffirmed their commitment to the Multiple-year Income-related Remuneration Improvement Model used as a framework for negotiations. The model and its applications are unique and has as a point of departure that the UFS must be and remain financially sustainable,” said Prof. Fourie and Prof. Johan Grobbelaar, Chairperson of UVPERSU and Spokesperson of the Joint Union Forum.

The agreement provides for the phasing in of fringe benefits of contract appointments for 2008. This includes the implementation of a pension/provident fund, housing allowance and the medical fund allowance as from 1 January 2008 to staff who are appointed on a contract basis.

Agreement was also reached that 1,0% will be allocated for structural adjustments in order to partially address the backlog in respect of remuneration packages of other higher education institutions. These adjustments will be made after further investigations during 2008.

The post levels that have been earmarked for adjustment are academic staff (associate professor, professor and dean) as well as certain post levels in the support services.

An additional R500 000 will be allocated to accelerate the rate of phasing in the medical fund allowances.

The implementation date for the salary adjustments is 1 January 2008, but could possibly be implemented only at a later stage due to logistical reasons. The adjustment will be calculated on the remuneration package.

The agreement also applies to all staff members of the Vista and Qwaqwa Campuses whose conditions of employment have already been aligned with those of the Main Campus.

Prof. Grobbelaar said that salary negotiations were never easy, but the model is an important tool. He said the Joint Union Forum illustrates that people from different groups can work together if they share the same commitment and goal.

In 2007, a total salary adjustment of 5,7% and a once-off non-pensionable bonus of R2 000 was paid to staff.

Media Release
Issued by: Lacea Loader
Assistant Director: Media Liaison
Tel: 051 401 2584
Cell: 083 645 2454
E-mail: loaderl.stg@ufs.ac.za
20 November 2007

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