The African black sugar ant (Lepisiota incisa) is one of several invasive introduced ant species in WA that have the ability to form super colonies by establishing interconnected nests with collaborative egg-laying queens. These super colonies can spread for hundreds of square kilometres.
These ants can be aggressive toward other ant species, potentially outcompeting and displacing important native ants.
African black sugar ants are a shiny dark brown ant about 2–3 mm in length. Visible under a hand lens or microscope, with thick blackish bristles is a pronounced spine between the thorax and abdomen.
Western Australian detections
African black sugar ants have been found in seven Western Australian suburbs. They were first discovered in Maddington in 2020, followed by detections in Welshpool, Fremantle, Wattleup, Forrestfield, Hazelmere and Maida Vale.
The African black sugar ant is a pest of national significance and all known infestations are under eradication.
African black sugar ants are highly likely to be suited to Australian conditions. They have a huge potential to establish in a wide variety of habitats, including precious, undisturbed bush areas. Once established, the aggressive behaviour and ability to produce huge super colonies of the ants may disrupt social, commercial and agricultural activities. The ant has been known to harvest plastic and infest electrical boxes and components, causing damage to infrastructure.
While this ant is a significant threat to our environment, it does not sting people or pets.
How to report
If you suspect you have African black sugar ants at your property you can report via
Pest and Disease Information Service (PaDIS)
T: +61 (0)8 9368 3080