Allegheny Mound Ant

Formica exsectoides

Characteristics –
Size: Workers of this species measure about 3/8-inch in length.

Color: Red head and thorax with black abdomen

Behavior – This ant derives its name from the way it constructs mounds, which usually measure up to three feet in diameter. The large mounds have resulted in occasional “fire ant scares” in northern states, although the Allegheny mound ant cannot sting. The ants feed on insects and the sweet honeydew produced by aphids and similar insects.

Habitat – Allegheny mound ants are found throughout the upper Midwest and northeast U.S., and are typically seen in yards located next to fields or wooded areas.

Tips for Control – Allegheny mound ants do not invade houses but their large mounds can make lawns unattractive. Typically, individual mounds will require direct treatment with an appropriately labeled pest control product.

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