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07 August 2025 | Story Martinette Brits | Photo Stephen Collett
Prof Willem Boshoff
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

OSM students off to Canada and Belgium
2016-07-01

Description: 001 OSM Naledi Lux Tags: 001 OSM Naledi Lux
Naledi Dweba will have the opportunity to
take part in tutorials such as reed making
and instrument adjusting when attending
the Belgian Clarinet Academy.

Photo: Supplied

Although he is only a first-year student at the Odeion School of Music (OSM), he will learn from, and share his knowledge with, the best in the world. Tuhafeni Michael from the University of the Free State has been selected for an international choral music residency at the Kokopelli Choir Association in Edmonton, Canada during June-July 2016.

Michael and Naledi Dweba are two OSM students that will enhance their skills abroad. Dweba, one of Danré Strydom’s clarinet students, has received a scholarship to attend the 2016 Belgian Clarinet Academy in Ostend, Belgium from 6-12 July.

Guest speaker at celebrations


Apart from receiving extensive training as choral conductor, Michael will also serve as a guest speaker during the Kokopelli Choir Association 20th anniversary. He will teach choral music from his native Namibia.

After the residency, he is expected to serve as an ambassador for the Kokopelli Foundation in Southern Africa. Apart from sharing his skills, he will also assist in recruiting new talented students, and act as mentor to other aspiring choral conductors.

“I’m hoping to really learn from some of the best choral conductors of our times, as well as from fellow students attending the course,” says Michael.

Masterclasses in rest of Europe


Dweba’s scholarship provides a week-long, intensive immersion in clarinet. Individual students receive at least 3 intensive private lessons, and participate in clarinet ensembles, receive chamber music coaching, observe and perform in masterclasses. The main instructors of the event will be Robert Spring (Arizona State University), Eddy Vanoosthuyse (Brussels Philharmonic Orchestra), and Deborah Bish (Florida State University).

After the scholarship, he will attend masterclasses in Germany and the United Kingdom.


 

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