Argentine ant — Linepithema
humile
Subfamily: Dolichodorinae
Identifying characteristics
- Workers are all the same size, small, 1/8-inch long
- Uniformly dull brown
- Petiole with 1 erect node
- Thorax uneven in shape when viewed from side
- Musty odor emitted when crushed
Behavior
- Feed on sweets, fresh fruit, and buds of some plants
- Tend honeydew-producing species
- Forage for sweets and oils in homes
- Travel rapidly in distinctive trails along sidewalks,
up sides of buildings, along branches of trees and shrubs,
along baseboards, and under edges of carpets
- Colonies may split in spring and summer when queen
and workers move to new site; not antagonistic toward
each other
Nest type and size
- Outdoors in soil, under wood, slabs, debris, mulch,
or in branches and cavities of trees and shrubs
- Shallow, 1- to 2-inch deep mounds in open, often disturbed
habitats, either moist or dry
Millions of ants per colony with multiple queens and
many subcolonies
Ant Control
- Residual pesticide spray that will last for at least 4 weeks performed on a monthly basis. One-time sprays are not suggested, since ants are very temperamental. If it is too cold they come inside for warmth; if it is too hot outside, they come inside to cool down.
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