Latest News Archive

Please select Category, Year, and then Month to display items
Previous Archive
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

‘Sola Scriptura’ — Does Scripture still reign as authority?
2017-02-21

Description: Theology Open Day Tags: Theology Open Day

Thania Labuschagne, Nico Oosthuizen, and
Suthea van der Westhuizen.
Photo: Supplied


Reformation 500: Sola Scriptura [scriptural authority] and contemporary conflicts of interpretation was the theme for the Faculty of Theology and Religion’s official opening and annual Open Day on the Bloemfontein Campus of the University of the Free State (UFS). The faculty was recently renamed to be more inclusive of other denominations, as well as to be sensitive to the impact religion has on society, both in the past and presently.

In his welcoming address to first-year students, Prof Fanie Snyman, Dean of the Faculty of Theology and Religion, said, “I hope that you indulge in the theological dish served to you, and that it will create in you a deep hunger to know more.”

One first-year, Neo Kgaje, had this to say, “I first wanted to do Archaeology, but then I decided to follow my calling as a missionary and study Theology. I would like to serve in my own community in Botshabelo.”

Thania Labuschagne, former chairperson of the Sola Gratia student association, said, “The annual opening is always very special for me. We become part of a family here.” Her message for first-years was, “Maintain your passion for what you do. Make sure of your calling, and everything else will fall into place.”

Prizes awarded
Prizes were awarded to several students who excelled in the previous year. The best third-year student in 2016 was Suthea van der Westhuizen; best fourth-year BTh student, Thania Labuschagne; and Nico Oosthuizen was recognised as the best Master of Divinity in the fifth year.

The Director of Shepherd Centre for spiritual leaders, Dr Gerhard Botha, awarded certificates for the completion of a 9-module short learning programme presented by the centre.

"May you hunger to know more"—
Prof Fanie Snyman, Dean of the
Faculty of Theology and Religion

Current affairs addressed through scriptural analysis
While acknowledging that the debates around the authority of Scripture are complex and not easily resolved, Prof Hendrik Bosman from the Faculty of Theology at Stellenbosch University (SU) argued that it is an indispensable precept of Christian theology. However, it can no longer be taken as a given, since the authority of Scripture is increasingly vulnerable. He said, “Sceptic academics and critical theologians are challenging the more traditional ways of accepting the authority of Scripture.”

Prof Bosman highlighted the negative impact that certain claims of scriptural authority have had on the marginalised and vulnerable groups in society — “the suffering endured by people of colour, Jews, the LGBTQI community, and women due to prejudice and hatred. … [When reading the Bible], one must also be held accountable by the marginalised and the vulnerable in society.”

Prof Juliana Claassens (Faculty of Theology, SU) presented Beyond Revenge: Responsible Bible Reading Practices in a Traumatised Land. “As a community of believers who hold dear the principle of Sola Scriptura, what do we do with texts that revel in the downfall of the enemy and propagate revenge as a viable solution to the hurt and pain people are experiencing?”

Prof Claassens continued, “This question is particularly relevant given the deep wounds that many in this beautiful country of ours carry. … There is thus a real danger that expressions of violence survive and grow ever stronger with each utterance, until the violent ideas they propagate are considered to be normal.” Her recommendation? “Foster communities of care, focused on breaking down walls, instead of erecting them.”

We use cookies to make interactions with our websites and services easy and meaningful. To better understand how they are used, read more about the UFS cookie policy. By continuing to use this site you are giving us your consent to do this.

Accept