More Pavement Ant Information
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Pavement Ant (Tetramorium caespitum)
General Information
The pavement ant, Tetramorium caespitum, is a common household pest. Their name comes from the fact that they usually make their homes in pavement. They are distinguished by two spines on the back, two nodes on the petiole, and grooves on the head and thorax.
During early spring, colonies attempt to conquer new areas and often attack nearby enemy colonies. These result in huge sidewalk battles, sometimes leaving thousands of ants dead. Because of their aggressive nature, they often invade and colonize seemingly impenetrable areas. In summer time the ants dig out the sand in between the pavements to vent the nests.
Description
The pavement ant is dark brown to blackish, and one-eighth inch long. It will eat almost anything, including insects, seeds, honeydew, honey, bread, meats, nuts, ice cream and cheese. The species does not pose a public health risk, but can contaminate food and should be avoided.
Behavior
Pavement Ants feed on honeydew, insects, sweets, fruit, and greasy foods.
Will feed on pet food both indoors and outdoors.
Trails seen going to and from food sources, most often at night.
Move in slow deliberate motion and are not easily disturbed.
May move through plumbing pipes and electrical wires.
Adjacent colonies fight, producing spectacular sidewalk “ant wars” in the spring.
Nest Type and Size
Nest in lawns or under stones, wood, or boards.
Mounds are built along sidewalks, baseboards, and near foundations in clusters.
Colonies tend to be found near water.
Usually one functional queen per colony.
Control
When ants invade your home take immediate action.
Sponge invaders with soapy water as soon as you see them.
Plug up ant entryways with caulk or petroleum jelly.
Remove infested potted plants.
Clean up food sources such as sugary spills, pet food, or garbage.
Rely on baits to control the ant colony.
Indoor sprays are not usually necessary.
Prevention
Focus efforts on following good sanitation practices and excluding ants from buildings.
Keep ants off of trees or shrubs near buildings.
Be prepared for annual invasions by caulking and baiting before the influx.
These ants can be controlled with the use of sugar baits laced with borax (boric acid). When some people find this is ineffective, residual insecticeds are used.
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