Tawny Crazy Ants Spread to Three Mississippi Counties

The invasive species, known for damaging electrical systems, recently expanded its presence to Wilkinson, Marion, and Perry counties.

Updated on Oct. 13, 2026 in Landscaping

Gouache-painted illustration showing small, dark ants crawling over mossy leaf litter and twigs, representing the spread of invasive species. — Tawny crazy ants have expanded into three additional Mississippi counties, posing risks to residential electrical systems by nesting in yard debris. AI Illustration. Upload story photo >

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Tawny crazy ants, an invasive species native to South America, have spread to three additional Mississippi counties in 2026. This brings the total number of affected counties in the state to seven since the initial discovery in Hancock County in 2009.

Why it matters

These ants pose a unique risk to households because they commonly nest under yard debris and can damage electrical equipment by shorting out wiring. Because the species is difficult to eradicate once established, homeowners must be vigilant about preventing colony entry.

Three additional counties in Mississippi were confirmed infested in 2026, marking a significant expansion after the spread had been relatively contained for 15 years. The state now reports seven total counties with established populations of the species, formally known as Nylanderia fulva.

The players

MSU Extension Insect Identification Lab

A research and diagnostic service that provides technical expertise and official species confirmation for pest specimens submitted by the public.

The details

The ants, which do not sting but can cause significant damage, frequently nest under rocks, leaf litter, firewood, and fallen limbs. They are known for moving into electrical equipment where they short out wiring, which can lead to costly repairs. Infestations should be managed by professionals who use specific treatments to create barriers around sensitive home areas and prevent the insects from entering the structure.

1931: Earliest known U.S. record of tawny crazy ants.
2009: First identification of tawny crazy ants in Mississippi.
2026: Ants spread to Wilkinson, Marion, and Perry counties.

The Home Front

The regional migration of Nylanderia fulva follows long-standing patterns of invasive species movement in the southern United States. Homeowners should treat this as a persistent environmental factor that necessitates ongoing vigilance regarding exterior property maintenance.

Clear your yard of excess firewood, leaf litter, and rocks to reduce the nesting sites that attract these ants. If you suspect an infestation, collect a sample and submit it to the MSU Extension insect identification lab for confirmation.

The takeaway

While these ants do not pose a stinging threat, their ability to destroy electrical systems makes early detection critical for home safety. Contact a licensed pest management professional to establish chemical barriers if you suspect activity on your property.