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PerthNow reported on 15 May 2025 that DPIRD had confirmed more than a dozen further African black sugar ant sightings across Perth’s south since the species was detected in Bibra Lake in March 2025. That is a dated report, not a current infestation count: the available sources do not establish how many cases are active in October 2026 or whether eradication is complete.
If you suspect you have seen these ants, report them to DPIRD and do not move potentially infested items. Colour and size can raise suspicion, but they cannot confirm the species.
What was reported about sightings near Bibra Lake?
PerthNow’s 15 May 2025 report, citing DPIRD, said there had been “more than a dozen further sightings” across Perth’s south since the first Bibra Lake detection in March 2025. The report said detected areas were treated with registered insecticide and would continue to be monitored. The figure describes sightings confirmed by that report’s date; it should not be read as the number of active infestations now. PerthNow’s 15 May 2025 report
DPIRD’s 2 May 2025 alert said all known infestations were under eradication. The department’s 2024–25 annual report later said the Bibra Lake and surrounding-area campaign continued. Those dated statements do not confirm the current status or that eradication has been completed. DPIRD’s 2 May 2025 alert · DPIRD Annual Report 2024–25
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How can you recognise an African black sugar ant?
DPIRD describes the ant as shiny dark brown to black and 2–3 mm long. Its thick blackish bristles are usually visible only with a hand lens or microscope. The department’s 2025 alert also advises watching for high numbers of ants that look alike. These features can help you decide whether to report a suspicion, but appearance alone is not a reliable species confirmation. DPIRD’s species guidance · DPIRD’s 2025 alert
A hand lens may help you inspect a very small ant, but it is not a substitute for expert identification. If you are unsure, send a report to DPIRD and ask for advice.
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How do you report a suspected sighting?
DPIRD’s 2 May 2025 alert asked residents in Bibra Lake and nearby Spearwood and Coolbellup to report suspected ants. You can send a photo through MyPestGuide Reporter or contact the department’s Pest and Disease Information Service (PaDIS) by phone or email. The details below are those listed in the 2025 alert. DPIRD’s alert and contact details
- Photo report: Use MyPestGuide Reporter, a free photo-reporting app and web service. DPIRD experts investigate reports, identify pests, and provide feedback and advice. MyPestGuide Reporter
- Phone: 08 9368 3080.
- Email: [email protected].
Should you move items that might have ants on them?
No. DPIRD warns that African black sugar ants can hitchhike in goods and materials, potentially starting new infestations. Do not move items you suspect may be infested; contact DPIRD for advice instead. The 2025 alert names cardboard, rubbish, building materials, plants, and garden waste among materials that may provide nesting places. DPIRD’s 2 May 2025 alert
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Why is DPIRD concerned about this ant?
DPIRD says the species can be aggressive toward native ants and may outcompete and displace them. It can form connected nests, sometimes described as “super colonies,” and live in urban, industrial, and natural environments. The department also warns that it can infest electrical boxes and damage plastic components and wiring. DPIRD’s species guidance
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What should residents avoid doing?
Do not try to confirm the species from colour or size alone, and do not move potentially infested goods or materials. The official guidance supports reporting suspected ants to DPIRD; it does not provide consumer instructions for pesticide application or DIY eradication. Leave identification and response advice to the department.
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