The Polyphagous Shot-Hole Borer (PSHB) - Euwallacea fornicates, is a tiny beetle about the size of a sesame seed that burrows into tree trunks, stems, and branches. Detected in East Fremantle in late 2021, PSHB has since spread to 25 local government areas, presenting an urgent threat to urban forests across Perth.
The beetle has a symbiotic relationship with the Fusarium fungus, which it cultivates as a food source inside galleries which it burrows within the tree. The fungus colonises the tissue within the host tree, disrupting its normal biological functions. As a result, the tree begins to wilt and die back, potentially leading to its premature demise - a devastating prospect for Perth's urban forests.
The Department of Primary Industries and Regional Development (DPIRD) oversees PSHB control efforts in accordance with the Biosecurity and Agriculture Management Act 2007. However, numerous Local Governments and authorities are proactively inspecting trees on their land to detect the pest early and mitigate potential damage.
At Arbor Urban, our skilled staff can identify reproductive tree hosts and inspect them for signs of PSHB infestation. We have received PSHB identification training from DPIRD and know what to look for when inspecting trees. We can also spatially map the trees under your management that are likely to be the primary PSHB reproductive hosts. Once mapped, we can monitor these trees on a schedule that fits your available resources and budget, using both ground and aerial inspections. Early detection of PSHB and prompt action are crucial for its control and eradication.