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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

Lecture focuses on how Marikana widows embody the transformative power of art
2015-08-11

Makopane Thelejane

"When I got the news of my husband is dead, I put my hands above my head, as you see me in this picture. I could not bear the ache in my heart." - Makopane Thelejane

A woman looks down on a canvas covered in thick layers of red, dark shadows falling across her face. A brief moment that captures the silently-devastating aftermath of the Marikana massacre that bled into the lives of 34 widows.

It is this silent trauma that was at the centre of the last instalment of the Vice-Chancellor’s Lecture Series for 2015. “These stories of the Marikana widows are important. It is these stories of silence that live behind the spectacular scenes of the violence,” Prof Pumla Gobodo-Madikizela, Senior Research Professor in Trauma, Forgiveness, and Reconciliation Studies at the University of the Free State (UFS) said at the event.

Panel
The lecture, which took place on Monday 27 July 2015 on the Bloemfontein Campus, took the form of a panel discussing the theme of “Speaking wounds: voices of Marikana widows through art and narrative”. The panel consisted of members from the Khulumani Support Group, including Dr Marjorie Jobson (National Director) and Judy Seidman (Sociologist and Graphic Artist), as well as Nomfundo Walaza, former CEO of the Desmond Tutu Peace Centre.

Betty Lomasontlo Gadlela

"Then this dark time came, a dark cloud over me. It made me to have an aching heart, which took me to hospital, from losing my loved one, my husband, in such a terrible manner. " - Betty Lomasontlo Gadlela

Trauma made visible
In a project initiated by Khulumani, the Marikana widows were encouraged to share their trauma through painting body maps – in which the widows depicted their own bodies immersed in their trauma – and narrating their personal stories. Throughout the workshops, the focus always remained on the women. As Siedman put it, “the power of this process is rooted in the participants. The statements of what the participants experienced is what’s important.”

Initially silenced and isolated, this group of women has now moved “into a space where they have become connected to each, and stand up for each other in the most powerful ways,” Dr Jobson said. “Our work is conceptualised in terms of giving visibility and voice to the people who know what it takes to change this country; to change this struggle.”

The transformative power of art and narrative
During her response, Walaza pointed out “how art and narrative can transform traumatic memory and become integrated in the survivors’ life story.” This gives individuals the opportunity, she said, “to step into a space of mutual listening and dialoguing in which people bond together.”

Co-hosted by Prof Gobodo-Madikizela and the UFS Institute for Reconciliation and Social Justice, the lecture series forms part of a five-year research project funded by the Andrew W. Mellon Foundation.

 

 

 

 

 

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