Why do I see ants in my Detroit kitchen in winter?
Ants indoors in winter usually mean a colony is already established inside or just under a heated building. Odorous house ants in particular can nest in warm wall voids and near radiators, then forage for sweets and moisture while the ground outside is frozen. The fix is finding the nest area, not wiping the trail.
Heated brick and plaster buildings stay warm all winter, and that warmth keeps indoor colonies foraging even when the soil outside is frozen. If you see ants in January, the colony is probably much closer than the edge of the yard.
Resist the urge to spray. A repellent spray on the trail can scatter the colony into new spots, which makes baiting harder.
Which ants are common around Detroit homes?
Pavement ants, odorous house ants and carpenter ants are the ants technicians commonly deal with in southeast Michigan homes, along with occasional other species. Pavement ants tend to live in and under paved areas, odorous house ants in walls and kitchens, and carpenter ants in damp or damaged wood.
That list is a working guide rather than a census, and the species you actually have is confirmed at the inspection. A trail that starts at a slab joint points to different steps than one that comes out of a bathroom wall.
Winged ants in the house can mean a mature colony is close by. They look like termite swarmers, so a technician checks the wings and waist before deciding which plan fits, and may refer you to a termite inspection if there is any doubt.
Why do ants return after I spray them?
Ants return because a sprayed trail only kills the workers you can see, while the colony and its queens stay hidden in a wall, slab or yard. Repellent sprays can also push the colony to split into new nests. Bait that workers carry home is usually what reaches the colony.
Ants are drawn to food and moisture, so cleaning crumbs, sealing food containers and fixing a slow leak under a sink all matter. They are the part of the job you can do between visits.
Wipe a trail only with soapy water if you must, and never wipe away bait. Let the foragers feed and carry it back.
Is it ants or termites?
Winged ants have a narrow waist, elbowed antennae and uneven wings, while winged termites have a thick waist, straight antennae and wings of equal length. When in doubt, save a few and have a technician look, because termite and ant swarmers can appear in the same weeks of spring.
Termites are present in southern Michigan, though how common they are in any one home is not something we can quantify. A swarm indoors is a reason to have the home checked, not a reason to panic.
Keep a few of the winged insects in a sealed container or on tape, and show them to the technician.
What can I do between visits to keep ants from coming back?
Remove the things ants come for: food crumbs, open pet bowls, sticky spills and standing moisture. Store pantry items in sealed containers, fix slow leaks, take out trash often and keep mulch, firewood and plants from touching the house. These habits support a treatment but do not replace finding the nest.
Walk the outside of the house once the ground thaws. Look for ant hills along slab joints, soil piled at the edge of a sidewalk and trails that climb the foundation. Note where they go in and tell the technician, since entry points are the best clue to where the colony lives.
Inside, the kitchen and bathroom are the usual trouble spots. A wet sponge, a leaking trap under the sink and a pet dish left out overnight can each keep a trail going, so those are worth fixing before the technician arrives.