Several species of carpenter ants can damage wood structures. The document identifies the two most common in California, Camponotus modoc and Camponotus vicinus, which construct extensive tunnel networks that can compromise structural integrity. It provides details on identifying characteristics, colony dynamics, damage signs, and integrated pest management strategies for prevention and control. Nonchemical approaches include exclusion, sanitation and moisture control, while chemical treatments involve locating nests and applying baits or insecticides directly into galleries.
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Carpenter ants are social insects, with colonies made up of several different forms or “castes”. They are so-called carpenter ants because of their habit of chewing wood to create nest sites. They do not eat wood, like termites, but excavate it with their strong, saw-like jaws to create random galleries where they nest. They play ecosystem roles particularly by aiding in the decomposition of decaying tees. Carpenter ants belong to the subfamily Formicinae (Genus: Camponotus)
Termites are social insects and live in colonies which are usually located in ground or in wood. Most termites feed on cellulose from wood and wood by-products such as paper; some tropical species feed on fungi, lichens etc.
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Carpenter ants seminar work by Uwamose martinsUwamose MNO
Carpenter ants are social insects, with colonies made up of several different forms or “castes”. They are so-called carpenter ants because of their habit of chewing wood to create nest sites. They do not eat wood, like termites, but excavate it with their strong, saw-like jaws to create random galleries where they nest. They play ecosystem roles particularly by aiding in the decomposition of decaying tees. Carpenter ants belong to the subfamily Formicinae (Genus: Camponotus)
Termites are social insects and live in colonies which are usually located in ground or in wood. Most termites feed on cellulose from wood and wood by-products such as paper; some tropical species feed on fungi, lichens etc.
Termites are usually divided into 3 groups based on the location of there colony; the Subterranean , the Drywood and the Dampwood termites. The biology and habitat of each group are different, so a detailed knowledge of each is necessary for effective control.
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1. PEST NOTES Publication 7416
University of California
Statewide Integrated Pest Management Program
Agriculture and Natural Resources August 2009
Several species of carpenter ants (Camponotus species) are capable of damaging wood in buildings and other structures. The two most destructive species in the Western United States are C. modoc and C. vicinus, both of which are found in California. Carpenter ants can become pests in any urban setting with ornamental shade trees, but they are particularly common in forested foothill and mountain communities.
IDENTIFICATION
Carpenter ants are among the largest ants in North America with workers of C. modoc (Figs. 1 and 2) and C. vicinus (Fig. 3) ranging from 1/4 to 1/2 inch long. They have only one bulge at their narrow “waist” (the single node on their petiole) and an evenly rounded back, when viewed from the side (known as a smooth dorsal thoracic profile).
The western black carpenter ant, C. modoc, is uniformly black with dark red legs, while C. vicinus varies in color but usually is red and black. A smaller, yellow and black species, C. clarithorax (Fig. 4), which also is common in California, ranges from a little longer than 1/8 of an inch to not quite 5/16 of an inch long.
Carpenter ants can’t sting but can inflict painful bites with their powerful jaws and spray formic acid into the wound, causing a burning sensation.
Homeowners might confuse the winged males and females that leave the nest on mating flights with termites. Figure 5 illustrates distinguishing features of the two pests. Carpenter ant sawdust is fibrous versus the 6-sided shaped pellets of drywood termites (Fig. 6).
COLONY DYNAMICS AND LIFE CYCLE
Carpenter ants feed on dead and living insects, nectar, fruit juices, and sugary honeydew excreted by plant-sucking insects.
They will enter buildings in search of nesting sites or moisture and can build nests containing several thousand ants. Typically, the nests they construct indoors are satellites of a larger, parent nest located outside in a live or dead tree, a woodpile, or landscaping materials. Several satellite nests can be associated with a single parent nest, where the queen or queens reside, as in the case of C. vicinus, which can have as many as 40 queens in a single nest.
New reproductives have wings and leave the nest on mating flights in the spring. The timing of these flights varies for each species. For example, C. modoc swarms in the late afternoon, often after a heavy rainfall. After the mating flight, males die, and inseminated queens disperse in search of potential nest sites such as a dead tree or stump. Here, the newly mated queen excavates a chamber, seals herself in, and begins laying eggs. Colony growth is slow at first and only after several years does the colony reach maturity and begin producing a new generation of winged ants to begin the cycle again.
DAMAGE
Carpenter ants don’t consume wood like termites but excavate it to make their nests, which in large colonies can consist of an extensive network of galleries and tunnels often beginning in an area where there is damage from water or wood decay (Fig. 7). From here they can expand the nest into sound
Integrated Pest Management In and Around the Home
Carpenter Ants
Figure 1. Western black carpenter ant, Camponotus modoc.
Figure 2. Winged female reproductive western black carpenter ant.
Figure 3. Camponotus vicinus worker ants with pupa.
Figure 4. Worker ant from the species Camponotus clarithorax.
2. August 2009 Carpenter Ants
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wood and compromise structural in-tegrity.
They also commonly nest in
wall voids, hollow doors, and insula-tion.
Infestations can even occur in new
buildings when land clearing in the
surrounding area disturbs established
colonies, causing them to move into the
structure.
In natural settings, they excavate into
the heartwood of living trees or into
dead trees and stumps. These latter
infestations play an important role in
the decomposition of wood.
MANAGEMENT
There are several nonchemical mea-sures
that can help prevent infestations:
• Trim tree branches and shrubs
away from structures to prevent
access;
• Seal off potential entry points
such as where utility lines enter a
structure;
• Reduce mulch around building pe-rimeters
to a depth of 2 to 3 inches
to discourage nesting;
• Eliminate any earth-to-wood con-tact
of structural elements that
might promote wood decay;
• Replace decayed or damaged wood
and correct problems that cause
decay such as clogged rain gutters
or leaky pipes;
• Increase ventilation to damp areas
such as attic or subfloor spaces;
• Store firewood off the ground and
several feet away from structures;
and
• Remove potential food sources
inside a structure and store them
in tightly sealed containers.
•
Because ants have a “sweet tooth,”
reducing the number of insects that
produce honeydew might control ants
around structures. For more informa-tion
on managing these pests, see Pest
Notes: Aphids, Pest Notes: Giant Whitefly,
and Pest Notes: Scales listed in Refer-ences.
Before attempting to control an infes-tation
using chemicals, inspect the
property for potential nesting sites
both inside and outside the structure
by observing ant activity and fol-lowing
trails, preferably after sunset
when carpenter ants are most active.
To attract these ants, set out nontoxic
baits such as sugar milk (equal parts
of sugar and milk) or diced crickets or
mealworms (which you can purchase
at a pet store or bait shop), then follow
the workers back to their nest. Look
and listen for other signs of infestation
such as sawdust; their excrement, or
frass; or a faint rustling in walls, floors,
and woodwork.
Once you have located a colony, you
can apply an insecticide directly into
the nest. You may need to drill holes in
order to gain access. Insecticide sprays
containing pyrethroids, such as perme-thrin
or cyfluthrin, and dusts contain-ing
disodium octaborate tetrahydrate
or desiccants are effective control
products. Desiccants are absorptive
powders (diatomaceous earth or silica
gel) that destroy insects by removing
the protective, waxy outer body layer,
causing the ant to dry out, or desiccate.
Of the desiccant dusts, diatomaceous
earth is readily available in retail stores,
but only a licensed pesticide applicator
can apply silica gel. Desiccant dusts are
low in toxicity to people and don’t lose
their effectiveness over time, as long as
they remain dry. Avoid inhaling these
materials, however, because they can
cause serious lung irritation.
Perimeter sprays with fipronil are
very effective against carpenter ants,
but only a licensed applicator can ap-ply
them. If toxic baits are used, they
should be slow-acting formulations, so
Wings (if present)
have few veins.
Ant
Thin waist
Antenna
elbowed
Termite
Hind wings are
smaller than
front wings.
Wings (if present)
have many small veins.
Front and hind wings
are same size.
Broad waist
Antenna
not elbowed
Figure 5. Distinguishing features of ants and termites.
Figure 6. Sawdust from carpenter ants is distinctly different from the pelletized
frass termites produce.
Figure 7. Wood damaged by mature car-penter
ants.
3. August 2009 Carpenter Ants
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the ants carry the toxicant back to the
nest and share it with the rest of the
colony. This is critical, because only
about 10% of the ants are out foraging
at any one time. Carpenter ants are fin-icky,
so first attract them to a nontoxic
food source like sugar milk or diced
crickets or mealworms. After the ants
start feeding, replace the nontoxic food
source with several different toxic baits
that are labeled for ant control, and let
them choose the one they prefer. When
selecting an insecticide bait, make sure
that ants are listed as one of the target
pests on the label.
REFERENCES
Bellows, T. S., J. N. Kabashima, and K.
L. Robb. Pest Notes: Giant Whitefly. Oak-land:
Univ. Calif. Div. Agric. Nat. Res.
Publ. 7400. Also available online, http://
www.ipm.ucdavis.edu/PMG/PEST-NOTES/
pn7400.html.
Dreistadt, S. H., J. G. Morse, P. A. Phil-lips,
and R. E. Rice. Pest Notes: Scales.
Oakland: Univ. Calif. Div. Agric. Nat.
Res. Publ. 7408. Also available online,
http://www.ipm.ucdavis.edu/PMG/
PESTNOTES/pn7408.html.
Flint, M. L. May 2000. Pest Notes: Aphids.
Oakland: Univ. Calif. Div. Agric. Nat.
Res. Publ. 7404. Also available online,
http://www.ipm.ucdavis.edu/PMG/
PESTNOTES/pn7404.html.
Hansen, L. D., and J. H. Klotz. 2005.
Carpenter Ants of the United States and
Canada. New York: Cornell Press.
Klotz, J. H., L. D. Hansen, R. Pospischil,
and M. K. Rust. 2008. Urban Ants of
North America and Europe: Identification,
Biology, and Management. New York:
Cornell Press.
Marer, P. 1991. Residential, Industrial, and
Institutional Pest Control. Oakland: Univ.
Calif. Agri. Nat. Res. Publ. 3334.
AUTHORS: J. H. Klotz, Dept. of Entomol-ogy,
UC Riverside; M. K. Rust, Dept. of En-tomology,
UC Riverside; and L. D. Hansen,
Dept. of Life Sciences, Spokane Falls Com-munity
College.
TECHNICAL EDITOR: M. L. Flint
EDITOR: M. L. Fayard
ILLUSTRATIONS: Figs. 1-2, J. K. Clark;
Fig. 3, R. Pospischil; Fig. 4, L. D. Hansen;
Fig. 5, adapted from Termites and Other
Wood-Infesting Insects. Oakland: Univ. Calif.
Agri. Nat. Res. Publ. 2532; Fig. 6, D. Kidd;
and Fig. 7, L. D. Hansen.
This and other Pest Notes are available at
www.ipm.ucdavis.edu.
For more information, contact the University of
California Cooperative Extension office in your
county. See your telephone directory for addresses
and phone numbers, or visit http://ucanr.org/ce.cfm.
University of California
Agriculture and Natural Resources Program
Produced by UC Statewide
Integrated Pest Management Program
University of California, Davis, CA 95616
University of California scientists and other
qualified professionals have anonymously peer
reviewed this publication for technical accuracy. The
ANR Associate Editor for Urban Pest Management
managed this review process.
To simplify information, trade names of products
have been used. No endorsement of named products
is intended, nor is criticism implied of similar products
that are not mentioned.
This material is partially based upon work
supported by the Extension Service, U.S. Department
of Agriculture, under special project Section 3(d),
Integrated Pest Management.
WARNING ON THE USE OF CHEMICALS
Pesticides are poisonous. Always read and carefully follow all precautions and safety recommendations
given on the container label. Store all chemicals in the original, labeled containers in a locked cabinet or shed,
away from food or feeds, and out of the reach of children, unauthorized persons, pets, and livestock.
Pesticides applied in your home and landscape can move and contaminate creeks, rivers, and oceans.
Confine chemicals to the property being treated. Avoid drift onto neighboring properties, especially gardens
containing fruits or vegetables ready to be picked.
Do not place containers containing pesticide in the trash or pour pesticides down the sink or toilet. Either use
the pesticide according to the label, or take unwanted pesticides to a Household Hazardous Waste Collection
site. Contact your county agricultural commissioner for additional information on safe container disposal and
for the location of the Household Hazardous Waste Collection site nearest you. Dispose of empty containers
by following label directions. Never reuse or burn the containers or dispose of them in such a manner that
they may contaminate water supplies or natural waterways.
NONDISCRIMINATION STATEMENT
The University of California prohibits discrimination or harassment of any person on the basis of race,
color, national origin, religion, sex, gender identity, pregnancy (including childbirth and medical conditions
related to pregnancy or childbirth), physical or mental disability, medical condition (cancer-related or
genetic characteristics), ancestry, marital status, age, sexual orientation, citizenship, or service in the
uniformed services (as defined by the Uniformed Services Employment and Reemployment Rights Act of
1994: service in the uniformed services includes membership, application for membership, performance of
service, application for service, or obligation for service in the uniformed services) in any of its programs
or activities.
University policy also prohibits reprisal or retaliation against any person in any of its programs or activities
for making a complaint of discrimination or sexual harassment or for using or participating in the investigation
or resolution process of any such complaint.
University policy is intended to be consistent with the provisions of applicable State and Federal laws.
Inquiries regarding the University’s nondiscrimination policies may be directed to the Affirmative Action/
Equal Opportunity Director, University of California, Agriculture and Natural Resources, 1111 Franklin Street,
6th Floor, Oakland, CA 94607, (510) 987-0096.
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