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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.

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News Archive

Horse-riding therapy improves self-confidence in children
2016-05-10


This group of Honours students in Psychology at the University of the Free State was honoured with the best postgraduate Service Learning award at the prize-giving function of the Faculty of the Humanities. From the left are Adriana de Vries, Hershel Meyerowitz, Simoné le Roux, Wijbren Nell, Melissa Taljaard, and Gerán Lordan. Photo: Marizanne Cloete.

Horse-riding therapy helps to improve self-confidence in children, and changes their perception of themselves. It puts them in a totally new environment where they can be free of any judgement.

According to Wijbren Nell, who achieved his Honours degree in Psychology at the University of the Free State (UFS), this is the ideal therapy when working with children with disabilities. He said it was amazing to see how they developed.

He was part of a group of Honours students in Psychology who received the best postgraduate Service Learning award in the Faculty of the Humanities for their community project. In 2015, this project by Wijbren, Hershel Meyerowitz, Gerán Lordan, Melissa Taljaard, Simoné le Roux, and Adriana de Vries, was part of their module Community and Social Psychology. They were honoured at the Faculty’s prize-giving function on 15 April 2016.

Purpose of project

“Our purpose with the project was to demonstrate to the children that they could still accomplish something, despite their disabilities,” Wijbren said. The students work on a weekly basis with learners from the foundation phase of the Lettie Fouché School in Bloemfontein. Marie Olivier’s Equistria Therapeutic Development Trust serves as the site for the community project. She has a long standing partnership with the UFS.

Horse-riding and therapy

According to Wijbren, the idea was to stimulate the psychomotor functioning of the children, as well as to promote their psychological well-being. He said research has shown that there is incredible therapeutic value in horse-riding. In this specific case, it has improved the children’s self-confidence, as they may have a poor self-image as a result of their disabilities.

“At the beginning of the year, there was a girl who didn’t even want to come close to a horse, let alone getting onto the horse. We kept on trying, and, once she was on the horse, we couldn’t get her down. This was the amazing thing about the project,” said Wijbren.

Award a surprise

Wijbren said the award was a honour and surprise to his group. He was full of praise for Dr Pravani Naidoo, a lecturer in Psychology at the UFS, who coordinates the therapeutic horse riding project. “She has a tremendous passion for this project, and challenged us to think on our feet. She is a real inspiration.”

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