A lot of people buy cockroach traps for the wrong reason. They see a roach in the kitchen, grab a pack of sticky traps at the store, scatter them around and wait for the problem to go away. A week later the traps have a few roaches on them and there are still roaches in the kitchen.
Traps aren’t useless. They’re just a different tool than most people think. A sticky trap is far better at telling you what’s going on than at fixing it, and used that way, it’s one of the most useful things you can put in a kitchen. Here’s how to get real information out of them.
What Cockroach Traps Actually Do
Most traps sold for roaches are glue boards or sticky monitors: a folded card with an adhesive floor and an opening on each end. A roach walks in along the edge it was already following and gets stuck.
Each trap catches the roaches that happen to walk through it. In a home with a real German cockroach problem, the roaches you can see are only a small share of what’s living behind the fridge, under the dishwasher and inside cabinet hinges. Traps won’t reach those, and they won’t touch egg cases. That’s why trapping alone rarely ends an infestation.
What traps are great at is answering three questions: Are there roaches? Where are they? And is it getting better or worse?
Where to Put Them
Roaches travel along edges and stay close to warmth, moisture and food. Put traps where they move, not where they’re easy for you to reach:
- Under the kitchen sink, pushed against the back wall
- Behind and beside the refrigerator, as close to the motor area as you can safely get
- Next to the dishwasher and the stove
- In the back corners of lower cabinets and the pantry
- Under bathroom sinks and behind the toilet
- Near the water heater and washing machine
Set the trap so the open ends line up with the wall or cabinet edge. A trap sitting in the middle of a cabinet floor catches far less than one tucked tight into a corner.
How to Read What You Catch
Date the traps when you put them down, and check them every few days for a week or two. Then look closely:
- Which trap has the most. Activity clusters near where they’re living. If the trap behind the fridge is full and the bathroom ones are empty, you know where to focus.
- Size of the roaches. Lots of small nymphs means they’re breeding in the home, not just wandering through.
- Type of roach. Small, light brown roaches with two dark stripes behind the head are German cockroaches, by far the most common indoor roach in the Treasure Valley. A larger, dark, shiny roach near a floor drain or in a damp basement is more likely an Oriental cockroach, which usually points to a moisture problem. Our cockroach identification guide can help you tell them apart.
- The trend. Fresh traps catching fewer and fewer roaches week over week is the best sign that a treatment is working.
Traps for American Cockroaches
American cockroaches are the big ones: reddish-brown, about an inch and a half to two inches long, with a pale, figure-eight-shaped band behind the head. They’re sometimes called “water bugs” or “palmetto bugs.” In the Treasure Valley they’re much less common indoors than German roaches, and they usually come up from sewer lines, floor drains, crawlspaces and damp basements rather than living in kitchen cabinets.
Because they travel different routes, American cockroach traps go in different places:
- Near drains. Next to floor drains, laundry drains and basement sumps.
- In basements and crawlspace access points, along the walls, where it’s dark and damp.
- In garages and utility rooms, near water heaters, pipes and the gap under the door to the house.
- Along the edges. Like other roaches, they follow walls, so place traps flat against the wall, not in the open.
Larger roaches can pull loose from small traps, so use full-size glue boards and check them every few days. Food-based attractants in some traps can help draw roaches out of hiding. If traps confirm American roaches, our guide to American cockroach bait covers where bait goes for this species. One American cockroach near a drain may be a wanderer from the sewer. Several over a few weeks, or nymphs in the traps, suggest they’re living somewhere in the structure. Keeping drains covered or flushed, fixing leaks, lowering humidity in basements and sealing gaps around pipes and under doors all cut down on how many get in.
Signs It’s More Than a Trap Can Handle
Call in help if you see any of these:
- Traps fill up within a few days
- You’re catching small nymphs along with adults
- You see roaches out during the day
- There are droppings that look like pepper along cabinet edges, or egg cases tucked into cracks
- There’s a musty, oily smell under the sink or behind appliances
Any of those means there’s an established population behind the walls and appliances. Store products tend to stall out at that point, for reasons we cover in does pest control work for roaches.
Disposing of Used Traps
Fold a full trap closed, seal it in a plastic bag and put it in the outside trash. Wash your hands after. Roach droppings and body parts can trigger allergies and asthma in some people, which the EPA’s asthma triggers guide covers in more detail, so it’s worth not letting a full trap sit in the kitchen.
Making Your Kitchen Less Friendly to Roaches
- Fix leaky faucets and drips under sinks. Water draws roaches as much as food does.
- Wipe counters and sweep at night, and keep food sealed.
- Don’t leave pet food or dirty dishes out overnight.
- Break down cardboard and get it out of the house, and check boxes and used appliances before they come in.
- Caulk gaps where pipes come through the wall under sinks.
How Professional Roach Treatment Works With Traps
When we treat roaches, monitoring traps are part of the process. The technician uses them to pinpoint where the roaches are living, treats those harborage areas directly, and uses fresh traps afterward to see whether activity is dropping. Follow-up visits are scheduled as needed based on what the traps and the inspection show.
Roach treatment is its own separate service. It isn’t covered by the quarterly plan in our residential pest control, and we’ll explain what your situation needs before anything gets scheduled. We also handle roaches for businesses like restaurants, offices and multi-unit properties through our commercial pest control in Boise and around the valley.
Talk to a Local Team
ProGuard is based in Eagle and serves Boise, Meridian, Nampa, Caldwell, Star, Middleton, Emmett and Garden City. If your traps are telling you there’s more going on, call us at (208) 352-2062 or send us a message.