The Coastal Brown Ant is an invasive insect with a reputation for its rapid spread, aggressive behaviour, and the ability to disrupt domestic gardens. For homeowners, understanding this pest may help protect your outdoor spaces, and knowing when to call in professional ant control like SURE Pest Control.
Identification and Behaviour
Coastal Brown Ants are small (2–3mm), light to dark brown ants. Unlike many native species, these ants thrive in disturbed environments, making suburban gardens, pavement cracks, and even wall cavities prime real estate. Their supercolonies contain multiple queens, allowing them to reproduce rapidly and rebound quickly if treatments are not effective.
Why Coastal Brown Ants Are a Problem in Perth
Garden Destruction
These ants farm sap-sucking insects like aphids and scale insects for their honeydew secretions. They indirectly damage plants, leading to stunted growth and diseased foliage.
Structural Risks
While they don’t eat wood like termites, Coastal Brown Ants excavate soil under pavers, pathways, and foundations, causing uneven surfaces and potential structural instability when infestations are extreme.
Dominance Over Native Species
As invasive pests, they outcompete local ant populations, disrupting biodiversity and soil health.

Ant Prevention Tips for Homeowners
- Eliminate Food Sources: Keep outdoor areas free of food scraps, secure bins, and clean up pet food.
- Seal Entry Points: Use silicone sealant to block gaps around doors, windows, and pipes.
- Trim Vegetation: Keep plants and mulch away from building foundations to reduce nesting sites.
Related post: Ant Prevention Tips for Every Season
Why DIY Ant Control Often Fails
Many homeowners attempt to tackle ant infestations with supermarket sprays or borax traps, but these rarely address the root problem. Coastal Brown Ants’ sprawling supercolonies and multiple queens mean spot treatments are ineffective. Worse, mishandled chemicals can harm beneficial insects or contaminate soil.
Professional Ant Control: The SURE Solution
SURE Pest Control is Perth’s trusted partner for safe, effective ant management. Serving residential and commercial clients across WA since 2010. Our Perth-based technicians employ targeted strategies and advanced baiting systems to eradicate an ant infestation at its source.
Contact SURE Pest Control today for a free quote.
