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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

Two UFS architecture students won prestigious PG Bison 1.618 Competition
2017-10-26

 Description: Bison read more Tags: : Stephan Diedericks, Department of Architecture, Margaux Loubser, Kobus du Preez, Zack Wessels, PG Bison 1.168 Competition 

At the PG Bison 1.618 competition awards ceremony
in Rosebank, were from the left:
Camrin Plaatjes from the University of KwaZulu-Natal;
Stephan Diedericks, winner of the competition;
and Margaux Loubser,
the second-place winner. Both Stephan and
Margaux are studying Architecture at the UFS.
Photo: Supplied



Food that reaches its sell-by date in supermarkets is usually disposed of, but has not yet reached its best-before date.  What happens to this food?  According to Stephan Diedericks, the answer to this is for this food to be repurposed.

Not only does Stephan want to prevent the waste of food – in a world where food security is a challenge – but he also won the prestigious PG Bison 1.618 Competition with his entry in which he suggests that gourmet meals be prepared from food that has reached its sell-by date, and then be served in the Delta Recycletorium. 

Students introduced to park lands in urban areas
Diedericks is a student in the Department of Architecture at the University of the Free State (UFS). Second-place winner in this competition was Margaux Loubser, also a UFS student. Another UFS student, Dehan Kassimatis, was a finalist. They received their awards at a ceremony in Rosebank, Johannesburg, earlier this month. 

The competition, now in its 24th year, was created to recognise the future interior and industrial designers, architects, and key decision-makers in the South African construction industry. It is known not only for the prestige it offers its winners, but also for the tradition-defying brief given to the students each year.

According to lecturers Kobus du Preez and Zak Wessels, in the Department of Architecture, the competition introduced the students to parklands in urban areas. He quotes the competition brief: “Rural to urban migration with the development of commercial and residential property elevates the importance of parklands within cities, in creating a refuge from the hustle of daily life.  These areas are leveraged to encourage healthier living, community interaction and environmental awareness.”

Learning experience more important than prizes
The site that was the focus of the competition is the Environmental Centre, Delta Park Heritage Precinct in Johannesburg. Students needed to transform this old building into a vibrant gastronomic restaurant. “The theme and style of the restaurant was for the student to choose,” said Du Preez. 

Loubser called her restaurant Rooted – a wholefood restaurant.  She was influenced by the geometries of the original Art Deco building. Rooted articulates and integrates the space between nature and the building.  Similar to an Art Deco painting or poster, the landscape is abstracted into terraces which are used to grow vegetables organically.  Vertical green screens soften the divide between the building and its surroundings and it provides shade.

“Our students took their clues from the existing environment and integrated it with a single idea, an abstract concept, which impressed the judges,” Du Preez said. 

Although this is a competition that is well reported in the industry press, Du Preez and Wessels agree that the learning experience for students is much more important than winning the contest. The competition’s brief aligned well with the Department of Architecture’s learning content with its urban focus.

Jacques Steyn, a UFS architecture student, came third in the competition in 2015.

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