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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

Inaugural lecture challenges leaders in higher education
2012-10-30

Dr Mamphela Ramphele
Photo: Stephen Collett
29 October 2012


Lecture
(Pdf format)

According to international statistics, South Africa’s school performance is rated 140th out of 144 countries. South Africa is also ranked 143rd out of 144 countries when it comes to  the quality of mathematics and science. About 600 000 South African graduates are unemployed and about 500 000 learners are failed by our current education system.

Dr Mamphela Ramphele brought these shocking statistics to the light at the inaugural lecture of the Annual Prestige Lecture at the Faculty of Education on Thursday 25 October 2012 at the University of the Free State (UFS).

This lecture will henceforth be known as the Mamphela Ramphele Prestige Lecture.

Dr Ramphelefocused her lecture on ‘Educating the 21st century citizen’.

“One of the defining characteristics of the 21st century is the vast number of choices that confront us every day at a personal, professional and political level.”

She asked if 21st century South Africans are equipped with the skills to make the choices that confront them daily.

“The failure to transform our apartheid education into one characterized by equity and excellence, is producing graduates who lack self-confidence.”

Dr Ramphele said that in South Africa about 1/6th of government expenditure goes to education, but the outcomes remain shocking.

For Dr Ramphele the answer lies in creating platforms for open conversation about South Africa’s painful past and the agenda for radical socio-economic restructuring should include the fundamental transformation of education.

She praised the UFS, under its current inspirational leadership, for its role as change agents through the education.

Prof. Rita Niemann, senior professor at the Faculty said the Annual Mamphela Ramphele lecture is to further expand and celebrate education in South Africa.

“Dr Ramphela has given us so much food for thought by challenging leaders in higher education to speak out about the questionable state of education in South Africa and to become engaged in the ‘revolution of the spirit’ in order to deliver citizens who own and shape the country.”
 

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