Pest Library
Pharaoh Ant
Pharaoh ants are tiny yellowish ants that nest indoors year-round in warm wall voids, insulation and equipment. They are notorious for budding: spray them and one colony becomes several, spread through more of the building.
Profile
- Scientific name
- Monomorium pharaonis
- Identification
- Pale yellow to amber with a darker abdomen tip, two waist nodes, no sting in practice.
- Typical size
- About 1/16 inch (1.5-2 mm).
- Behavior
- Multi-queen colonies that split readily and travel long distances through voids and conduits.
- Habitat
- Wall and ceiling voids, insulation, appliance housings, behind tile and around plumbing.
- Diet
- Sweets, grease and protein; readily takes baits when competing food is reduced.
- Lifecycle
- Continuous indoor reproduction; colonies persist and expand year-round.
- Why it matters
- A contamination concern in food and healthcare settings because colonies travel widely inside buildings.
- DIY considerations
- Do not spray. Retail sprays are the single most reliable way to make a pharaoh ant problem worse.
- Professional considerations
- Control is bait-driven and building-wide, with sanitation and moisture findings addressed and adjacent units inspected.
Signs of activity
- Very small yellow ants on counters, in sinks and along ceiling lines
- Ants appearing in several rooms or units at once
- New trails a few days after a spray treatment
- Activity around warm equipment and plumbing chases
Prevention
- Keep food debris and sugary residue cleared in shared kitchens
- Seal void access at plumbing and electrical penetrations
- Report activity building-wide rather than treating one unit
- Reduce moisture around fixtures and equipment
Sources
Related information
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