Ant trails show up in St. Bernard kitchens for two reasons: water and weather. A few days of hard rain pushes colonies out of saturated soil and up into slabs, wall voids and brick weep holes. A dry stretch does the same thing in reverse — the ants come looking for moisture, which is why you often find them first around the dishwasher, under the sink trap, or in the shower grout before you ever see them near food.
Argentine ants are the ones that run in long, steady lines along countertop edges and baseboards, often from a nest under the slab or in mulch against the foundation. They don't have one queen or one nest, which is why wiping the trail and spraying the entry point buys you about a day. Pharaoh ants and ghost ants — small, pale, usually indoors — react to repellent sprays by budding: the colony splits and scatters, and a kitchen problem becomes a kitchen, bathroom and bedroom problem. Fire ants are a yard issue until floodwater drives them to higher ground, at which point they turn up around slab edges, A/C pads and door thresholds. Carpenter ants, which matter most in older raised houses in Chalmette and Arabi, are a symptom: they nest in wood that has already been softened by a roof leak, a bad flashing detail or a long-wet crawl space.
Identification is the first thing a technician should do, before anything comes off the truck. If someone quotes you a treatment over the phone without asking what the ant looks like, where you're seeing it and what time of day, they're guessing.
A proper ant job runs from the outside in. That means walking the perimeter for the conditions feeding the colony — mulch or soil piled above the slab line, irrigation spray hitting the wall, downspouts dumping at the foundation, shrubs and tree limbs touching the roof, gaps at utility penetrations and weep holes. Treatment usually pairs a non-repellent material applied to the exterior band and entry points with interior baiting in the areas where ants are actually foraging. Non-repellents work because ants walk through them and carry them home; baits work for the same reason. Both take time. You should expect trailing to continue, sometimes to look worse, for several days before it drops off, and that is normal rather than a sign the treatment failed.
Indoors, you get better results by leaving the trail alone until the technician sees it. A wiped-down counter hides the route back to the nest.
Cost tracks the size of the structure, how much perimeter there is to treat, whether the nest is in the yard or under the slab, and whether the species needs a bait program rather than a single visit. Carpenter ants cost more because the moisture source has to be found and dealt with. Ask whether follow-up visits are included, what you need to do before treatment, and how long to keep pets and children off treated areas.
Cypress Perimeter Group is licensed and insured, works as licensed contractors, and covers Chalmette, Arabi, Meraux, Poydras, New Orleans and Gentilly. Estimates are free, same-day service is available, and several payment methods are accepted. Call during office hours — Monday to Friday 8am to 6pm, Saturday 8am to 1pm.