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Linepithema humile
What do they look like?
Argentine ants are an invasive species known for displacing native ants. They are also one of the most troublesome home-infesting pests. Moist areas, like mulch, under debris on the ground, under piles of refuse and home foundations, attract Argentine ants. When the weather cools in fall, the pests may use gaps and cracks around the house to take shelter.
Because Argentine ant nests support multiple queens, these pests breed rapidly and create huge colonies that can number into the hundreds of thousand of workers. Drawn to decay and waste, the insects spread bacteria wherever they go. Argentine ants feed by transferring food from mouth to mouth, making baits more effective than aerosol or liquid insecticides.
Argentine ants kill other insects and invade human dwellings. Over time, the network of interconnecting colonies could become a massive infestation. Each colony of Argentine ants can contain millions of insects and multiple queens. These colonies can populate entire city blocks. Argentine ant infestations are best left to a professional pest control operator to identify and treat.