Ants

Ants at Home: Breaking Trails and Cutting Off Food Sources

That line of little ants marching straight to the honey jar isn't a coincidence: they left a chemical trail for the rest to follow. It's very common in Costa Rica; the good news is that erasing the trail, removing the food, and sealing where they get in usually does the trick. Ants are after water and food; cut those off along with their way back, and they lose interest. The EPA recommends exactly these practices. Here are concrete steps to follow. If the colony is already inside (walls or under floors), professional control may be necessary; pair this with how to diagnose an ant problem, sealing food and trash, and sealing cracks.

Practical steps (in order)

1. Erase the trail: wipe the route you see with a cloth soaked in water and soap or vinegar. That erases the pheromones and disorients the ants coming behind. If they reappear, repeat; sometimes the nest is in a nearby planter or crack.
2. Cover up anything that attracts them: sweets, honey, jam, fruit, and leftovers in tightly sealed containers. Clean up any spilled juice, honey, or sugar right away: a single drop is enough to keep a whole line busy.
3. Find the entry point: follow the line backward. It's usually a seam, a window frame, a pipe pass-through, or a crack. Seal it with caulk or silicone so they have no way back in.
4. Dishes and crumbs: don't leave dirty dishes or crumbs on tables or floors. Washing up right after eating and wiping down the eating area removes the "reward" they're after.
5. Trash: use lidded bins and take out the trash often. If the bin is open or leaking, ants will find it.

Useful tip

If ants are heading to one fixed spot (a window, say), the nest is very likely close by: in a planter, under a rock, or in a crack. Watching the route gives you clues for where to seal or treat.

EcoPlagas Technical Team

Pest control specialists · EcoPlagas

Content produced by EcoPlagas' technical team (Ecofumigadora Hermanos Paniagua S.R.L.), a pest control company licensed by the Ministry of Health, with chemical oversight and trained technicians. More than 10,000 customers served from 12 locations, green-label products. Learn more about us.