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Carpenter Ants E-412 12-11 Carpenter Ants Wizzie Brown and Roger E. Gold* arpenter ants, Camponotus sp., are social reproductives (kings C insects that make their colonies primarily and queens). Each in wood. They hollow out wood or excavate colony has only one insulation to build their nests. Unlike termites, they functional queen, do not eat wood. except in mature Outdoors, carpenter ants are not serious pests. colonies during the Although their excavations may occasionally weaken Figure 1. Adult carpenter ant. swarming season. tree branches and limbs, in most cases, carpenter ants Carpenter ants nest in wood that is already rotten or damaged by can be yellowish red, solid black, or a combination termites. of black, red, and reddish orange. Unlike other ants, They become pests when they nest or forage for they have only one segment (or node) between the food in homes and other buildings. An infestation thorax and abdomen, a circle of hairs at the tip of the usually begins when part of an existing colony moves abdomen, and an evenly rounded thorax (no spines or into a house. bumps) when viewed from the side. The presence of carpenter ants can indicate that Winged carpenter ants resemble winged termites a building has problems such as moisture, rotting and, in Texas, it is not uncommon for both of these wood, or other conditions conducive to infestations. wood-destroying insects to swarm at the same time. Texas species of carpenter ants cause less damage to It is vital that they be identified accurately, because structural wood than do carpenter ants from other control measures differ greatly between the two insect parts of the United States. They are nuisance pests and groups. rarely cause damage to framing lumber. But, their Ants are constricted between the thorax and presence is especially undesirable for home sellers in abdomen and have a “wasp waist.” Their wings are Texas because they are considered a potential wood- destroying organism. The carpenter ant look-alike Acrobat ants, Crema- Identification togaster sp., are Carpenter ants are relatively large. Adults often confused with carpenter ants since (Fig. 1) vary in length from about 1⁄4 inch to 5/8 both may nest in inch for worker ants, and up to ¾ inch for winged dead wood. Acrobat ants are smaller than carpenter ants, 1⁄8 *Extension Program Specialist, Integrative Pest Management; inch to 3⁄8 inch, and Professor and Extension Specialist in Urban Entomology, have a heart-shaped The Texas A&M System. The acrobat ant. abdomen. Carpenter ant colonies start out Antennae Middle elbowed Antennae not elbowed small the first 2 or 3 years, but then grow part of body rapidly. In 4 to 6 years they can contain not narrow up to 3,000 or more ants, depending on the species. These ants can also have interconnected satellite colonies. Middle Older, mature colonies continuously Wings similar in shape, size, part of and pattern with many veins produce winged reproductives to replace body is those that die. They produce 200 to 400 narrow or constricted winged individuals for reproductive flights Wings not alike in shape, size, or pattern each year. Winged reproductives usually with few veins develop in late summer, spend winter in the nest, and swarm in spring and early Figure 2. Ant, left, and termite comparison. summer. unequal in length, with the front pair longer than Nesting sites the hind pair. Their antennae are bent at right angles Carpenter ants normally build their nests in about mid-length (Fig. 2). hollow trees, landscaping timbers, logs, posts, and Termite bodies are broadly joined between wood used in homes and other structures. They shel- the thorax and abdomen; their wings are of equal ter themselves and their brood (eggs, larvae, pupae) length; and their antennae are straight with bead-like in wood and gaps in insulation and wood framing. segments. Colony growth for some species is influenced by mois- ture, with higher moisture levels favoring growth and Biology and habits brood development. This may explain why carpen- ter ant nests are more common in wood with higher Mature carpenter ant colonies produce male moisture content. and female winged reproductive ants (Fig. 3). Carpenter ants excavate their galleries follow- Environmental conditions cause reproductive ants to ing the grain of the wood and excavate the spring, or emerge and swarm. They mate during these swarms lighter-colored, wood rings. Unlike termites, which (nuptial flights), which may occur over several days or often line their wood galleries with mud, the carpenter weeks. After the nuptial flight, the males die and the ant galleries are clean and smooth. females begin searching for a nesting site. They carry dead insects, shredded wood frag- After establishing the nest, the female lays eggs and ments, and other nest debris from the excavations and cares for the larvae by feeding them with fluids secreted place them outside. Cone-shaped piles of these frag- from her body. Under favorable conditions, the larvae ments, or frass piles, build up beneath nest openings. grow, pupate, and become adult worker ants in 4 to If you look closely, you can see the “kick-hole” or tiny 8 weeks. After becoming adults, the new generations opening to the gallery, where ants bring frass to drop of workers expand the nest, excavate galleries, and it from the nest. Locating a kick-hole provides a way take over the task of providing food for the queen and to access a nest for treatment with an insecticide. Frass larvae. is not always visible because ants may dispose of it in hollow parts of trees, in unused galleries in the nest, or in void areas in structures. Carpenter ants enter structures through cracks and crevices around windows and in foundation walls, through heating or air-conditioning ducts, where tree branches or utility lines contact a structure, and through ventilation openings in the attic. They nest in wood that is moist or has been previ- ously damaged by water or termites. This damage can Figure 3. Winged reproductives—male on left, female on right. happen where there is a leak, condensation, or contin- uously high relative humidity. Typical nest locations trim boards, and wooden porch floors and columns. include: Also inspect overhanging power or utility lines, tree • wood affected by clogged gutters, damaged limbs, and vines. In living trees, openings to a nest flashing, improper pitch of porch floors, leak- usually occur in crotch angles, dead areas, knotholes, ing door and window frames, or water seepage or scars. Carpenter ants may travel as far as 100 yards from water leaks; from their nest to a food source; you can sometimes • wood between the ceiling and roof of flat-deck follow foraging carpenter ants to find their nest. porches; During the inspection, you may find other wood- • areas around plumbing in kitchens and bath- infesting insects or damage they caused. For more rooms where water leaks have soaked the information, refer to Extension publications E-368, surrounding wood; Subterranean Termites; E-367, Formosan Subterranean • wood in contact with soil, such as porch sup- Termites; E-366, Drywood Termites; and L-1826, ports, siding, and stair risers; Carpenter Bees. • wood in areas of poor ventilation or conden- Prevention sation such as attics, cellars, crawl spaces, and under porches; These actions can reduce the likelihood of carpen- • voids or insulation around bathtubs, hot tubs, ter ant infestations: or showers; • Correct moisture problems such as leaking • hollow ceiling beams, shower and curtain rods, faucets, roof leaks, and water drainage issues. wooden doors, porch posts and columns, and • Replace termite- or decay-damaged wood. tongue-and-groove construction; • Ensure proper clearance between soil and struc- • window and door framing; tural wood. • attic, crawl space, and wall insulation, including • Provide good ventilation under the house and in rigid foam board insulation. the attic. • Remove logs, stumps, and wood debris near the Diet house. Store firewood away from the house. Carpenter ants are omnivorous. They eat a great • Trim tree or shrub limbs that touch the structure. variety of both animal and plant foods including fresh fruits; honeydew from aphids, scale insects, and other plant-sucking insects; living or dead insects; plant Insecticide treatment juices; other small invertebrates; common sweets such Baits as fruit, honey, jelly, sugar, and syrup; and most kinds Baits are a mixture of a toxicant and food that is of fat, grease, and meat. Unlike termites, they cannot attractive to carpenter ants. Baits can reach colonies in digest wood cellulose. out-of-reach or undetected locations and are relatively Carpenter ants forage mostly at night, following safe and easy to apply. Several commercial products fence rails, garden edging, tree branches, water hoses, designed specifically for carpenter ant control include or other linear guidelines to make their way from a such active ingredients as abamectin, fipronil, and nest in a tree to indoor locations. hydramethylnon. This type of insecticide is effective when foraging carpenter ants take the baits and pass Management the toxin to the queen and brood. Carpenter ants can be selective in what baits they Inspection will accept. Some colonies readily take baits; others The key to managing carpenter ants is to identify accept only certain baits at different times of the year. all locations where a colony could exist. Thoroughly Carpenter ants tend to have a varied diet, so availability inspect the structure, both inside and out. Carefully of other foods may also play a role in bait acceptance. examine common infestation areas for signs of If you buy a carpenter ant bait and it is not readily carpenter ants. Conical piles of shredded wood debris carried away by the ants, try the same product later in (frass piles) indicate that a nest may be nearby.
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