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Help the city get shot of shot hole borers that are infesting our trees
Cape Town - Residents have been reminded to attend an online meeting regarding the invasive
Polyphagous Shot Hole Borer beetle (PSHB), which has now been discovered in trees in Newlands, Rondebosch and Mowbray.
The meeting, hosted by the City, is taking place from 6.30pm to 8pm on Tuesday where officials will provide more information about the symptoms of infested trees, how to report sightings to the City, and what action to take.
The beetle poses a serious threat to the urban forest as infested trees have to be chipped. Residents are encouraged to get involved in preventing this pest from spreading even further.
Some trees in Newlands, Rondebosch, Mowbray and Claremont have been infested already, with the Liesbeek River being identified as a priority pathway.
Mayco member for Spatial Planning and Environment, Eddie Andrews, said: “We are calling on residents, interest groups and experts to assist the City to prevent this pest from spreading even further.
“The beetle is threatening our urban forest. This is a very serious and alarming situation. I want to caution our communities not to be complacent, and to inspect all trees on private properties for symptoms of infestation. It is very important to note that infested trees may not be removed from the property as the removal of the chipped wood will spread the pest to other areas.
“At this online meeting, officials from our Invasive Species Unit will give important information. I urge residents to please attend this online meeting if possible, and to help us beat the beetle,” said Andrews.
A Boxelder tree infested with the invasive beetle was discovered on a private property in Newlands on January 24, 2023. Since then, the Invasive Species Unit has been conducting assessments in the Newlands, Rondebosch, Mowbray and Claremont areas. The Liesbeek River has been identified as a priority pathway, and the City has allocated resources to conduct assessments to determine the extent and distribution of the beetle in the area.
The City said it will soon commence with the removal of infested trees on City owned land – these are public open spaces, river corridors, green belts, road verges and public parks."
In Australia as well, from a very official site (
Source) :
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Polyphagous shot-hole borer
Polyphagous shot-hole borer (PSHB)
Euwallacea fornicatus is a beetle native to Southeast Asia. The beetle attacks a wide range of plants by tunnelling into trunks, stems and branches.
PSHB has a symbiotic relationship with a Fusarium fungus, farming it inside the tree as a food source for the beetle and its larvae. In susceptible trees, the fungus kills vascular tissue causing Fusarium dieback and tree death.
Establishment of this pest in WA would have significant impact on amenity trees, native vegetation, and the fruit and nut tree industries.
Current Situation
The Department of Primary Industries and Regional Development is responding to the confirmed detections of an exotic beetle Polyphagous Shot-Hole Borer (PSHB) in the Perth metropolitan area. Response activities include:
- Conducting surveillance to determine the distribution of PSHB
- Containing the pest to prevent further spread to non-infested regions within Western Australia
- Providing advice and information to residents, industry and other stakeholders
- Ensuring that all response activities are conducted safely, consistently and efficiently
To stop the spread, a Quarantine Area Notice (QAN) is in place to support the Department of Primary Industries and Regional Development’s ongoing surveillance program to determine the spread of the pest.
The Quarantine Area covers 21 local government areas. The new areas added to the expanded QAN are the City of Bayswater, City of Belmont, Town of Bassendean and three localities in the City of Swan – South Guildford, Guildford and Caversham.
The QAN continues to apply to the local government areas of Cambridge, Canning, Claremont, Cockburn, Cottesloe, East Fremantle, Fremantle, Melville, Mosman Park, Nedlands, Peppermint Grove, Perth, South Perth, Stirling, Subiaco, Victoria Park and Vincent.
How does the pest and its symbiotic fungus survive and spread?
Native to Southeast Asia,
PSHB has spread to Israel, California and South Africa.
It is possible PSHB hitchhiked to Australia on untreated wooden articles and packaging materials. Subsequent spread can be aided by the movement of infested wood (eg pruned trees, firewood) or wooden products such as furniture.
Only female PSHB beetles have the ability to fly and disperse to other trees.