The White-footed House Ant (Technomyrmex difficilis) is a small, dark-coloured ant species commonly found in Australian homes and gardens. Known for its pale legs and persistent trails, this ant species forms large colonies that can be difficult to manage once established.

While not harmful to humans or property, their sheer numbers and ability to spread quickly make them one of the most common nuisance ants across Melbourne and coastal regions.

Identification

White-footed ants are medium-small, measuring around 2.5 to 3 mm long. They are black to dark brown, with distinct yellowish-white legs (tarsi). They have a single narrow waist segment, 12-segmented antennae, and no sting.

These ants are often mistaken for Argentine ants (Linepithema humile), but they can be identified by the absence of a small vertical projection on the petiole. Colonies may contain thousands of workers and multiple nesting sites connected by visible foraging trails.

They feed mainly on sweet substances such as plant nectar, fruit juices, and honeydew produced by insects like aphids and scale insects. Indoors, they are attracted to sugary foods and moisture, particularly in kitchens and bathrooms.

Threats

Although they don’t bite, sting, or damage structures, white-footed ants are major household nuisances. They often trail into kitchens, bathrooms, and storage areas, contaminating food and surfaces. Outdoors, they protect aphids and scale insects, increasing honeydew build-up that encourages sooty mould, reducing plant health and appearance. In large numbers, they can also displace native ants, disrupting garden ecosystems.

Preventions

Because of their large colonies, white-footed ants are difficult to control. Prevention focuses on reducing attractants, blocking entry points, and maintaining cleanliness.

Hygiene and Maintenance:
Keep benches and floors clean, store food in sealed containers, fix leaks, remove standing water, and empty bins regularly. Inspect wall voids and windows for early signs of trails.

Garden Management:
Trim trees and shrubs touching buildings to remove access bridges. Clear leaf litter, mulch, and debris near foundations. Manage sap-feeding insects like aphids using safe garden treatments to reduce honeydew sources.

Professional Baiting:
Large infestations often require licensed pest technicians. Professionals use low-toxicity baits placed strategically along trails and nesting sites for safe, effective control. Regular monitoring ensures full colony elimination. Avoid DIY sprays, as they may worsen infestations.

Summary

The White-footed House Ant is a persistent pest both indoors and outdoors. While harmless, their large colonies and sweet-feeding behaviour make prevention essential. Good hygiene, garden care, and professional baiting provide lasting control. Gill Pestworks promotes safe, eco-friendly pest management to keep Melbourne homes clean and ant-free.