Invasive Animal

Argentine Ant

Linepithema humile

About This Species

Argentine ants are one of the most prolific invasive insects in the world. They form supercolonies, where many nests are packed very closely together, and workers from different nests show no aggression towards one another. This allows Argentine ant populations to grow to enormous proportions capable of reaching up to 1 million ants within a space of 10 m² underground.

Argentine ants are native to much of South America, including Argentina, Brazin, Paraguay, and Uruguay. They were first found in BC (Victoria) in 2012 and have not been detected anywhere else in the province since then. Fortunately, these ants cannot tolerate cold temperatures, and thus may not be able to spread throughout much of BC. Though they may be able to establish in other areas of the South Coast. Argentine ant nests spread by a process called ‘budding’, where new queens leave a nest and walk a short distance before settling a new nest nearby. Because of this, they don’t spread very far very fast, and spread over larger distances is usually by human activity.

Though these ants are not dangerous to humans, they pose a serious threat to other ant species, and can become a serious nuisance pest in human buildings and public spaces.

How to Identify

Argentine ants are typically 3.5 mm long and light brown, they are easy to mistake for other species that forage inside human homes, such as the Odorous house ant (Tapinoma sessile). Odorous house ants release a slightly sweet, solvent-like odor when disturbed or crushed. Argentine ants are odorless.

Argentine ants do not sting or bite humans, but they are known to forage inside homes in huge numbers, creating dense foraging trails containing thousands of individual ants.

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Take Action

Prevention is the best approach.

PREVENTION TIPS

 

If you have ants in your home or place of business, contact a local pest management company.

If you are traveling or moving soil or potted plants from an area where Argentine ants are known to live, check your vehicle and belongings carefully to avoid bringing along any hitchhikers.

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