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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

Resource Manual on Trafficking in Persons for Judicial Officers sees the light

2012-03-27

Judge Connie Mocumi, President of the South African Chapter of the International Association of Women Judges (SAC-IAWJ), during the launch of the Resource Manual on Trafficking in Persons for Judicial Officers.
Photo: Leonie Bolleurs
27 March 2012

On Human Rights Day the Department of Criminal and Medical Law in the Faculty of Law at the University of the Free State (UFS) hosted the launch of the Resource Manual on Trafficking in Persons for Judicial Officers compiled by the South African Chapter of the International Association of Women Judges (SAC-IAWJ).

The manual, which will be used by members of the South African judiciary, will equip officials in adjudicating the multifaceted crime of human trafficking.

“Presiding officers must be sensitised about the complexity of the crime. Human trafficking has many faces and presents itself in different ways. A person may for example be trafficked for sexual exploitation, forced labour, the removal of body parts, as well as forced marriages. Expert knowledge is needed to handle these cases effectively in court,” said Dr Kruger, also responsible for the human trafficking initiative in the Unit for Children's Rights at the UFS.

Prior to the launch, a total number of 300 judicial officers, including six judges from the Southern African Development Community (SADC) received training on human trafficking. After receiving this training, the officers were sensitised to scrutinise domestic violence cases as well as inter-country adoption cases in order to identify possible human trafficking activities.

As keynote speaker at the launch, Dr Beatri Kruger from the Department of Criminal and Medical Law at the UFS, said that human traffickers were running operations like a well-oiled machine. They have abundant and sophisticated resources and often bribe corrupt officials to further their criminal activities. In South Africa, people combating human trafficking struggle with a lack of resources as well as comprehensive legislation. Most cases are prosecuted under the Children’s Act and the Sexual Offences Amendment Act of 2007. Unfortunately, this legislation still leaves a gap in the prosecuting of perpetrators. Only trafficking cases where where children are trafficked can be prosecuted under the Children’s Act. In terms of the Sexual Offences Amendment Act perpetrators can be prosecuted for trafficking persons for sexual exploitation only, and not for labour of other forms of trafficking. Therefore the comprehensive Prevention and Combating of Trafficking in Persons Bill 2010 needs to be finalised to cover all forms of trafficking.

There are more slaves today than at any time in the history of humankind. “To combat this serious problem, we need to follow a holistic approach,” said Dr Kruger. This includes prevention (raising awareness), effective prosecution and suitable punishment, the protection of victims, and partnering with all relevant stakeholders, including people in the communities. Community members are often whistle blowers of this crime.

The President of the SAC-IAWJ, Judge Connie Mocumi, handed copies of the manual, a three-year project, to judicial officers present at the launch. The manual covers, among others, the definition of trafficking in persons, trafficking in persons in South Africa and the Southern African region, a legislative framework, victims’ rights and criminal proceedings.

“It is critical that judicial officers appreciate the phenomenon of trafficking in persons in its broader socio-economic context. Therein lays the ability to deal competently with the often-nuanced manifestation of this scourge. The incapacity to recognise these nuances can deny victims access to justice. In that regard, the manual, amongst others, is to become an important empowering adjudication tool for judicial officers,” said Judge Mocumi.

More copies will be printed and be ready for distribution by the beginning of May this year.

Judge Belinda van Heerden, who also attended the launch, said: “There is progress on the judicial and legislative front to bring wrongdoers to book. This manual will go a long way in giving judicial officers insight into the problem.”

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