What Are Odorous House Ants?
Odorous house ants (Tapinoma sessile) are one of the most common ant invaders in North Carolina homes. These small, dark brown to black ants (about 2.5–3 mm) get their name from the rotten coconut-like smell they produce when crushed. They form long trailing lines along baseboards, countertops, and cabinets.
Habitat & Behavior
Odorous house ants are extremely adaptable, nesting both indoors and outdoors. Indoor nests are found in wall voids, around hot water pipes, under carpets, and near heaters. Outdoor nests occur under stones, mulch, logs, and in soil. Colonies can contain multiple queens and tens of thousands of workers.
These ants have a strong preference for sweet foods—honeydew, sugar, syrup, and fruit juice—but will also eat meats, dairy, and other insects. They are most likely to invade homes during rainy weather when outdoor food sources are washed away or during hot, dry periods when they seek water.
Prevention & Control
Odorous house ants are persistent and can quickly rebound from partial treatments. Spraying repellent insecticides can actually worsen the problem by causing colony budding (splitting into multiple new colonies). The most effective control uses sweet liquid baits placed along active trails, combined with sealing entry points and eliminating moisture sources.