Invasive Tawny Crazy Ants Spread in Mississippi

Homeowners in newly affected counties should monitor for infestations that can damage household electrical equipment.

Updated on Oct. 27, 2026 in Landscaping

Gouache-painted illustration showing a cluster of small ants emerging from a crack in a weathered wooden wall, evoking residential pest concerns. — Invasive tawny crazy ants have spread into nine Mississippi counties, prompting state officials to advise homeowners to monitor their electrical systems for damage. AI Illustration. Upload story photo >

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Tawny crazy ants have now been confirmed in nine Mississippi counties, with Lamar County recently added to the list of affected areas. The invasive species, which nests in soil, mulch, and even wall voids, is known for infesting homes and damaging electrical equipment.

Why it matters

These ants pose a unique risk to property owners because they congregate in large numbers, often causing malfunctions in household electrical systems. As the species continues to spread into new areas like the Pine Belt, maintaining clear property perimeters has become essential.

Officials have confirmed the presence of the invasive ants in nine Mississippi counties, including Marion, Perry, and now Lamar. The infestation was first detected in the state in 2009.

The players

Mississippi State University (MSU) Extension

An academic and agricultural service provider that manages insect identification and provides state-specific pest management guidance.

The details

Tawny crazy ants are highly invasive insects from South America that form large, fast-moving colonies. They colonize various household habitats including soil, leaf litter, rotting wood, and roof coverings, and they are especially problematic for homeowners due to their tendency to invade electrical equipment and wall voids. If you suspect these ants on your property, specimens must be submitted to the MSU Extension Insect ID Lab for official confirmation.

2009: Tawny crazy ants were first detected in Mississippi.
October 2026: The invasive species was confirmed in the Pine Belt region.

The Home Front

The expansion of the Termidor SC Section 18 registration to Lamar County reflects a reactive approach to containing the rapid spread of the species in residential areas. This follows a long-term trend of managing invasive pests that compromise home infrastructure through state-regulated chemical controls.

Check areas around your home where moisture and debris collect, such as mulch beds, wall voids, and near exterior electrical equipment. If you spot large groups of fast-crawling ants, contact your local extension office to have samples submitted for proper identification.

The takeaway

Tawny crazy ants are an increasing nuisance that can migrate from your landscape into your home's electrical systems. Property owners should clear away leaf litter and debris from foundations and report suspected infestations to the MSU Extension Insect ID Lab for verification.