How to Get Rid of Pharaoh Ants | Baiting Is The Only Fix

Getting rid of pharaoh ants requires baiting, since sprays scatter colonies and make the problem worse.

Pharaoh ants are among the most frustrating pests in a home because the standard fix backfires. Spraying them with a contact insecticide is exactly the wrong move — it triggers “budding,” where the colony splits and spreads to new nesting sites. How to get rid of pharaoh ants hinges on a baiting program that works with the colony’s own biology, not against it.

This guide covers the bait-and-sanitation method that entomologists and pest control professionals rely on, where to place bait, how to seal the house, and what to avoid. If you’re comparing poison options, our tested roundup of the best ant bait for pharaoh ants breaks down the top performers.

Why Sprays Fail On Pharaoh Ants

Contact sprays are the wrong primary tool for pharaoh ants. The University of California’s Statewide IPM Program states plainly that sprays “will only make infestations worse by dispersing colonies to new locations.” When a worker is sprayed, the colony senses the threat and fragments — one nest becomes several, each capable of starting a new infestation.

Repellent sprays create the same problem. They don’t kill the colony; they just push it to split and relocate. The ants you see are foragers — killing them does nothing to the queen and brood hidden in the walls. That’s why baits are the preferred method: workers carry the poison back to the nest, where it eliminates the colony at the source.

The Baiting Steps That Actually Work

Baiting works because ants treat the toxicant as food and ferry it back to the colony. The British Pest Control Association emphasizes that treatment fails if you don’t use enough bait points. Here’s the sequence that works:

• Find the trails. Pharaoh ants nest in warm, moist, hidden spots — wall voids, under floors, behind appliances. Watch where workers travel; that line of ants is your baiting map.
• Place bait along trails, not on ants. Squeeze gel bait into small spots — about 1/8 inch in diameter — or lines about 1/8 inch by 3 inches, per Sumari product guidance. Don’t spray the ants you see.
• Start outside and work inward. The BPCA recommends beginning baiting at the perimeter of the infested area, then moving deeper. This keeps the colony from fleeing deeper into the structure.
• Use enough bait points. A single dab in one corner won’t cut it. Cover every trail and foraging area you can find, in every infested room.
• Let the bait work. Workers need time to carry the poison back and feed it to the queen. Resist the urge to clean up the bait or spray the area while it’s working.

If you’ve already sprayed and the ants scattered, start baiting anyway. The split colonies will follow the same trails and take the bait.

Sanitation And Exclusion Are Half The Battle

Bait works best when it’s the most appealing food in the room. If crumbs and grease are everywhere, the ants will eat that instead of your bait. Remove the competition:

• Store food in airtight containers and remove pet food between feedings.
• Clean crumbs, grease, and spills promptly; take out trash regularly.
• Fix leaks and dry damp areas. Pharaoh ants thrive in warm, humid spaces, so a leaky pipe is an open invitation.
• Seal entry points. Caulk cracks around windows, doors, foundations, utility lines, and gaps between walls and floors.

After baiting, monitor the trails. If activity persists after a few days, reapply bait. Pharaoh ants can shift food preferences, so you may need to rotate bait types — a point repeated in pest-control guidance, though not in the official sources.

One more option exists for structural nesting: a non-repellent insecticide applied as a spot or crack-and-crevice treatment after baiting has done its job. But note: some vendor recommendations for inside crack-and-crevice sprays conflict with the UC IPM warning that sprays worsen infestations — treat those as vendor sales pitches, not best practice. Always read the product label, and keep sprays out of electrical fixtures unless the label allows it.

Common Mistakes That Prolong An Infestation

Most failed pharaoh ant treatments share the same errors. If your infestation has survived your efforts, check this list:

• Spraying first. Contact sprays cause budding — the exact opposite of what you want.
• Using repellent sprays or barrier products that block trails but don’t kill the colony.
• Under-baiting. Too few bait points, or missing entire foraging areas, leaves the colony alive.
• Ignoring food sources. Accessible food, grease, or pet bowls compete with the bait.
• Treating only visible ants. The colony is hidden; spot-treating the stragglers you see never wins.

These control recommendations apply to homes and small buildings. If you’re dealing with ants in a lawn around the structure, — but the sanitation and baiting advice holds everywhere.

FAQs

How Long Does Pharaoh Ant Bait Take To Work?

Workers must carry the bait back to the nest, feed it to the queen and brood, and let it eliminate the colony. Continue monitoring trails and reapply bait while any activity remains.

Can I Use Regular Ant Spray On Pharaoh Ants?

No. Regular contact sprays trigger budding, splitting the colony into multiple sub-nests and spreading the infestation throughout your home. The University of California IPM program explicitly warns that sprays worsen pharaoh ant problems. Non-repellent baits are the only effective first-line treatment.

Why Do Pharaoh Ants Keep Coming Back?

They keep returning because the colony was never eliminated, or because water and food sources remain accessible. Incomplete bait coverage leaves the queen alive. Fix leaks, store food tightly, seal cracks, and make sure bait points cover every trail and room.