UC IPM Online UC ANR home page UC IPM home page

UC IPM Home

SKIP navigation

 

How to Manage Pests

Key to Identifying Common Household Ants


Pharaoh ant—Monomorium pharaonis
Subfamily: Myrmicinae

Pharaoh ant
Photo by Max Badgley

Pharaoh ant characteristics

Identifying characteristics

  • Workers are all the same size, 1/16-inch long
  • Yellow or honey-colored to orange
  • Petiole with two nodes
  • Thorax uneven in shape when viewed from side with no spines
  • 12-segmented antennae with 3-segmented club

Behavior

  • Feed on both living and dead insects
  • Inside, feed on sweets, fats, and proteins
  • Travel in set trails along carpets, countertops, cabinets, floors, and baseboards
  • Found in places with moisture
  • May use electrical wires and plumbing pipes to travel from room to room
  • Colonies very mobile; workers, along with larvae, pupae, and even a few queens, may move to new locations if disturbed or if colony becomes too large

Nest type and size

  • Nest in household structures such as wall and cabinet voids, behind baseboards, behind refrigerator insulation, inside hollow curtain rods, or in the folds of sheets, clothes, or paper
  • Outdoors nest in debris or cracks and crevices
  • Colonies with up to 300,000 workers with multiple queens

See also, pharaoh ant quick management tips.


Statewide IPM Program, Agriculture and Natural Resources, University of California
All contents copyright © 2017 The Regents of the University of California. All rights reserved.

For noncommercial purposes only, any Web site may link directly to this page. FOR ALL OTHER USES or more information, read Legal Notices. Unfortunately, we cannot provide individual solutions to specific pest problems. See our Home page, or in the U.S., contact your local Cooperative Extension office for assistance.

Agriculture and Natural Resources, University of California

Accessibility   Contact webmaster.