Signs of an Ant Infestation

Spotting one or two ants in your kitchen is rarely the whole story. If you notice any of these warning signs, you likely have an established colony nearby:

• Visible ant trails — Lines of ants marching along baseboards, countertops, window sills, or exterior walls following pheromone paths back to their nest.
• Wood shavings or sawdust piles — Carpenter ants excavate wood to build their galleries, leaving behind small mounds of frass (fine wood shavings) near door frames, window sills, or structural beams.
• Small dirt mounds near foundations — Pavement ants push soil to the surface as they tunnel, creating tiny mounds in cracks in driveways, sidewalks, and along your foundation.
• Winged ants (swarmers) indoors — Finding winged ants inside your home signals a mature colony nearby that is sending out reproductives to start new colonies. These are often confused with termite swarmers—a critical difference we can identify for you.
• Faint rustling sounds inside walls — Large carpenter ant colonies can produce an audible rustling or crinkling noise inside wall voids, especially at night when the house is quiet.

If you are seeing any of these signs, do not wait. Ant colonies grow rapidly, and many species establish satellite nests that make the problem exponentially harder to control over time. Contact us for a free inspection.

Common Ants in the St. Louis Area

Correct identification is the first and most critical step in ant control. Different species require fundamentally different treatment strategies. Here are the four most common ants we encounter in the greater St. Louis region. Visit our Pest Library for a full identification guide.

Our Ant Treatment Process

We do not believe in one-size-fits-all pest control. Every ant problem is different, and our five-step process is designed to eliminate the colony—not just knock down visible foragers.

1. Comprehensive Inspection — We thoroughly inspect your home’s interior, exterior, and surrounding landscape to locate entry points, active trails, and nesting sites. We check wall voids, moisture-damaged wood, plumbing penetrations, tree limbs touching the structure, and every area ants exploit.
2. Species Identification — Correct ID is everything. We determine the exact species, assess colony size, and identify whether you are dealing with a single colony or multiple satellite nests. Carpenter ants, odorous house ants, and pavement ants all require different chemistries and approaches.
3. Targeted Treatment — Based on the species and situation, we deploy a customized combination of non-repellent liquid treatments, professional-grade baits, dusts for wall voids, and exterior perimeter barriers. Non-repellent products are critical—ants cannot detect them and carry the active ingredient back to the queen and brood, collapsing the colony from within.
4. Follow-Up Monitoring — We return to verify colony elimination, check bait stations, and address any new activity. Depending on the severity, follow-up visits are typically scheduled within 2–4 weeks of the initial treatment to ensure complete control.
5. Prevention Plan — We provide you with a detailed prevention plan including moisture control recommendations, exclusion tips (sealing cracks, trimming vegetation), sanitation guidance, and an ongoing exterior treatment schedule to keep ants from returning. We are not done until you are ant-free and protected long-term.

Why DIY Ant Control Fails

We understand the temptation to grab a can of ant spray from the hardware store. Unfortunately, store-bought ant sprays almost always make the problem worse. Here is why:

• Colony budding: Most retail sprays contain repellent pyrethroids. When ants detect these chemicals, they do not just avoid the area—the colony splits. Queens and workers scatter to establish new satellite colonies in other parts of your home, turning one colony into three or four.
• Surface kill only: Sprays kill the foragers you can see, but the queen (deep inside the nest) continues laying hundreds of eggs per day. Within days, new workers replace the ones you killed.
• Wrong product, wrong species: Different ant species respond to different baits and chemistries. The sweet bait that works for odorous house ants will be completely ignored by carpenter ants, which need protein-based formulations. Professional identification ensures the right approach from day one.

Professional-grade non-repellent treatments and transfer-effect baits work because ants cannot detect them. Foraging workers unknowingly carry the active ingredient back to the nest, where it spreads through the colony via grooming and food sharing—ultimately reaching and eliminating the queen. This is the only reliable path to complete colony elimination.

Why Choose Roberts Pest Control

Frequently Asked Questions