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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 failure of the law
2004-06-04

 

Written by Lacea Loader

- Call for the protection of consumers’ and tax payers rights against corporate companies

An expert in commercial law has called for reforms to the Companies Act to protect the rights of consumers and investors.

“Consumers and tax payers are lulled into thinking the law protects them when it definitely does not,” said Prof Dines Gihwala this week during his inaugural lecture at the University of the Free State’s (UFS).

Prof Gihwala, vice-chairperson of the UFS Council, was inaugurated as extraordinary professor in commercial law at the UFS’s Faculty of Law.

He said that consumers, tax payers and shareholders think they can look to the law for an effective curb on the enormous power for ill that big business wields.

“Once the public is involved, the activities of big business must be controlled and regulated. It is the responsibility of the law to oversee and supervise such control and regulation,” said Prof Gihwala.

He said that, when undesirable consequences occur despite laws enacted specifically to prevent such results, it must be fair to suggest that the law has failed.

“The actual perpetrators of the undesirable behaviour seldom pay for it in any sense, not even when criminal conduct is involved. If directors of companies are criminally charged and convicted, the penalty is invariably a fine imposed on the company. So, ironically, it is the money of tax payers that is spent on investigating criminal conduct, formulating charges and ultimately prosecuting the culprits involved in corporate malpractice,” said Prof Gihwala.

According to Prof Gihwala the law continuously fails to hold companies meaningfully accountable to good and honest business values.

“Insider trading is a crime and, although legislation was introduced in 1998 to curb it, not a single successful criminal prosecution has taken place. While the law appears to be offering the public protection against unacceptable business behaviour, it does no such thing – the law cannot act as a deterrent if it is inadequate or not being enforced,” he said.

The government believed it was important to facilitate access to the country’s economic resources by those who had been denied it in the past. The Broad Based Economic Empowerment Act of 2003 (BBEE), is legislation to do just that. “We should be asking ourselves whether it is really possible for an individual, handicapped by the inequities of the past, to compete in the real business world even though the BBEE Act is now part of the law?,” said Prof Gihwala.

Prof Gihwala said that judges prefer to follow precedent instead of taking bold initiative. “Following precedent is safe at a personal level. To do so will elicit no outcry of disapproval and one’s professional reputation is protected. The law needs to evolve and it is the responsibility of the judiciary to see that it happens in an orderly fashion. Courts often take the easy way out, and when the opportunity to be bold and creative presents itself, it is ignored,” he said.

“Perhaps we are expecting too much from the courts. If changes are to be made to the level of protection to the investing public by the law, Parliament must play its proper role. It is desirable for Parliament to be proactive. Those tasked with the responsibility of rewriting our Companies Act should be bold and imaginative. They should remove once and for all those parts of our common law which frustrate the ideals of our Constitution, and in particular those which conflict with the principles of the BBEE Act,” said Prof Gihwala.

According to Prof Gihwala, the following reforms are necessary:

• establishing a unit that is part of the office of the Registrar of Companies to bolster a whole inspectorate in regard to companies’ affairs;
• companies who are liable to pay a fine or fines, should have the right to take action to recover that fine from those responsible for the conduct;
• and serious transgression of the law should allow for imprisonment only – there should be no room for the payment of fines.
 

Prof Gihwala ended the lecture by saying: “If the opportunity to re-work the Companies Act is not grabbed with both hands, we will witness yet another failure in the law. Even more people will come to believe that the law is stupid and that it has made fools of them. And that would be the worst possible news in our developing democracy, where we are struggling to ensure that the Rule of Law prevails and that every one of us has respect for the law”.

 

 

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