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26 September 2019 | Story Leonie Bolleurs | Photo Leonie Bolleurs
Read More Prof Wijnand Swart PSHB
A small 2 mm beetle, known as the Polyphagous shothole borer (PSHB) kills and infects trees. South Africa is the largest geographical area in the world to be infested with this tree killer. Pictured here is Prof Wijnand Swart who is working with two neighbourhood associations in Bloemfontein to monitor the occurrence of the beetle in the city.

Ornamental trees are dying all over South Africa, and it is feared that certain fruit and nut trees are also in danger. This is cause for great concern, not only among ecologists, farmers, foresters, and landscapers, but for homeowners as well. In private gardens and on streets throughout the country, trees that are afflicted include English oak, Chinese and Japanese maples, boxelder, and sweetgum.
 
The cause of all this havoc is a small 2-mm beetle, known as the Polyphgous shothole borer (PSHB; Euwallacea fornicatus) that originates from Southeast Asia.

Working to find a solution

"Based on damage seen in the USA and Israel, there is significant danger of losing many of our ornamental trees as well as fruit and certain nut trees in South Africa,” says Prof Wijnand Swart, Professor of Plant Pathology and Discipline Head in the Department of Plant Pathology at the University of the Free State (UFS).

Cases of afflicted trees were reported from all provinces in South Africa, except for Mpumalanga. Countries such as Israel and the USA have also suffered great losses as a result of this beetle.  

Research is being conducted on the beetle and its associated fungus, Fusarium euwallaceae, in order to understand their relationship and hopefully find a solution to stop, or at least manage, the invasion of trees. To investigate the largest geographical outbreak of this beetle in the world, academics from seven universities in South Africa are working together with the Forestry and Agricultural Biotechnology Institute (FABI) at the University of Pretoria through a multi-institutional and multi-disciplinary research network. UFS researchers are part of this network.
 
Senior Lecturer in the UFS Department of Plant Sciences, Dr Gert Marais, is conducting research on the PSHB and its associated fungi, with the focus on pecan trees, in conjunction with the South African Pecan Nut Producers' Association. Cases of infected pecan-nut trees were reported in the Northern Cape as well as in Nelspruit. 
 
Prof Swart is working with entomologists in the UFS Department of Zoology and Entomology to find a biological control agent to parasitise the beetle. “I have already found one instance of a parasitic wasp associated with the beetle and will continue to search for more specimens during the coming summer,” he commented. 
 
Understanding the beetle

The first cases of infected trees were discovered in 2017 when Dr Trudi Paap, associated with FABI and the South African National Biodiversity Institute, conducted a survey of pests and diseases in and around National Botanical Gardens in South Africa. 
 
FABI has been studying the tree killer intensively to find out more about its life cycle. The term ‘polyphagous’ refers to the ability of the PSHB to infest many different tree species.

On their website, FABI states that an important distinction is being made between different types of infestations. “Reproductive host trees are trees that are infested by the beetle and where it successfully establishes a breeding gallery in which the fungus grows, where eggs are laid, and larvae develop into mature adults, thus completing its life cycle. The majority of reproductive hosts eventually succumb to the disease symptoms caused by the fungus.”
 
“Non-reproductive host trees are trees where the beetle attacks, penetrates, and inoculates the fungus, which then starts to grow in the sapwood. However, the beetle either leaves or dies without reproducing in these trees. The fungus can eventually kill or damage reproductive hosts, but many of the tree species on this list seem to be unaffected.”
 
Involving the community

The situation also provides an opportunity for communities to directly benefit from research conducted by tertiary institutions. Prof Swart is working together with two neighbourhood associations in Bloemfontein to monitor the occurrence of the beetle in the city and surrounding areas. 

He urges residents in the Mangaung Metro who find instances of infected trees, to report it to Duart Hugo (duarthugo99@gmail.com ), who is compiling a database of infected trees in the area. 
 
FABI advises homeowners to cut down heavily infested reproductive host trees. Should you decide to burn the wood, note that beetles will fly away when the wood becomes hot or when smoke appears. Do not burn infested trees in uninfected areas.

Other interesting material

News Archive

The TRC legitimised apartheid - Mamdani
2010-07-20

 Prof. Mahmood Mamdani
“The Truth and Reconciliation Commission (TRC) accepted as legitimate the rule of law that undergirded apartheid. It defined as crime only those acts that would have been considered criminal under the laws of apartheid.”

This statement was made by the internationally acclaimed scholar, Prof. Mahmood Mamdani, when he delivered the Africa Memorial Lecture at the University of the Free State (UFS) last week on the topic: Lessons of Nuremberg and Codesa: Where do we go from here?

“According to the TRC, though crimes were committed under apartheid, apartheid itself – including the law enforced by the apartheid state – was not a crime,” he said.

He said the social justice challenges that South Africa faced today were as a result of the TRC’s failure to broaden the discussion of justice beyond political to social justice.

He said it had to go beyond “the liberal focus on bodily integrity” and acknowledge the violence that deprived the vast majority of South Africans of their means of livelihood.

“Had the TRC acknowledged pass laws and forced removals as constituting the core social violence of apartheid, as the stuff of extra-economic coercion and primitive accumulation, it would have been in a position to imagine a socio-economic order beyond a liberalised post-apartheid society,” he said.

“It would have been able to highlight the question of justice in its fullness, and not only as criminal and political, but also as social.”

He said the TRC failed to go beyond the political reconciliation achieved at Codesa and laid the foundation for a social reconciliation. “It was unable to think beyond crime and punishment,” he said.

He said it recognised as victims only individuals and not groups, and human rights violations only as violations of “the bodily integrity of an individual”; that is, only torture and murder.

“How could this be when apartheid was brazenly an ideology of group oppression and appropriation? How could the TRC make a clear-cut distinction between violence against persons and that against property when most group violence under apartheid constituted extra-economic coercion, in other words, it was against both person and property?”, he asked.

“The TRC was credible as performance, as theatre, but failed as a social project”.

Prof. Mamdani is the Director of the Institute of Social Research at the Makerere University in Kampala, Uganda; and the Herbert Lehman Professor of Government in the Department of Anthropology at the Columbia University in New York, USA.

Media Release
Issued by: Mangaliso Radebe
Assistant Director: Media Liaison
Tel: 051 401 2828
Cell: 078 460 3320
E-mail: radebemt@ufs.ac.za  
20 July 2010
 

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