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How to Manage Pests

Key to Identifying Common Household Ants

Petiole nodes

One-node versus two-node ants:
  • The petiole is the first characteristic looked at when identifying ants.
  • Ants have either 1 or 2 petiole nodes.
  • Locate the petiole, the first portion of the abdomen, and count the number of segments present.

One-node ant

Two-node ant

One node
Two nodes

Statewide IPM Program, Agriculture and Natural Resources, University of California
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