Understanding the Polyphagous Shot-Hole Borer: A Growing Concern in Western Australia
The Polyphagous Shot-Hole Borer (PSHB) is a small yet highly invasive beetle native to Southeast Asia, posing a significant threat to a wide range of plant species. Measuring approximately the size of a sesame seed, this beetle tunnels into the trunks, stems, and branches of various trees and plants, leading to severe damage and, in some cases, death of the host. Its small size makes detection particularly challenging, allowing it to spread rapidly before significant symptoms appear.
The Quarantine Response in Perth Metro
Recently, the Department of Primary Industries and Regional Development (DPIRD) has responded to the detection of PSHB within the Perth Metro area by establishing a quarantine zone. This measure is aimed at restricting the movement of wood and plant materials to prevent further spread of this pest.
Quarantine Regulations
Residents in Zone A face the following restrictions:
Movement of Wood: Untreated or unseasoned wood cannot be moved outside Zone A unless it is chipped into pieces 2.5 cm or smaller in diameter.
Plant Materials: Any plant materials, including living plants, that exceed 2 cm in diameter cannot be moved out of Zone A.
Machinery Cleaning: All machinery used to handle green waste must be cleaned before it is allowed to move outside Zone A.
Residents in Zone B are also subject to specific restrictions:
Movement of Wood: Similar to Zone A, untreated or unseasoned wood cannot be moved outside the quarantine area unless chipped to the specified size.
Plant Materials: Plant materials greater than 2 cm in diameter cannot be moved outside the quarantine area.
Entry to Zone A: Residents in Zone B can move wood or plant materials into Zone A.
Machinery Cleaning: All machinery must be cleaned before being moved outside the quarantine area.
Impact on the Wheatbelt Region
The implications of the PSHB detection extend beyond the Perth Metro area, particularly affecting the Wheatbelt region. Many Wheatbelt residents frequently travel to Perth, which raises concerns about inadvertently transporting the beetle or infected materials back to their communities. Therefore, DPIRD strongly advises against bringing any plants or wood materials from Perth to the Wheatbelt unless they comply with the established requirements.
Although PSHB has not yet been detected in Northam, DPIRD is proactively conducting trapping and surveillance efforts to monitor its spread. This includes placing traps at various locations, including the Shire's two tip sites, to gather data on the beetle's presence and movement.
Conclusion
The Polyphagous Shot-Hole Borer represents a serious threat to the health of our trees and plants, particularly in the Perth Metro and surrounding regions. As DPIRD continues to implement quarantine measures and conduct surveillance, community awareness and compliance with regulations are crucial. By following these guidelines, residents can help mitigate the risk of spreading this invasive pest and protect the natural landscape of Western Australia.
For more information: Polyphagous shot-hole borer | Agriculture and Food
For brief overview: PSHB DL infographic.pdf (agric.wa.gov.au)
Published eNews #395, October 2024
