How to Get Rid of German Roaches in Your Arizona Kitchen
Short answer: skip the bug bomb. German roaches hide in cracks a spray can't reach, so cut off their food and water, use gel bait in the cracks, and treat again before the next egg cases hatch.
Why German Roaches Are Hard to Get Rid Of
German cockroaches live their whole lives indoors, near food, water and warmth. The UC Statewide IPM Program says an adult can hide in a crack about 1/16 inch wide, and the University of Arizona Cooperative Extension notes they hide inside appliances, which is what makes control hard. Each egg case holds about 30 young, and the female carries it until a day or two before it hatches, so the eggs are protected from most sprays.
That's why store-bought sprays and foggers disappoint: they kill the roaches you see and push the rest deeper into the walls and cabinets. What works is bait the roaches eat and carry back, plus less to eat and drink everywhere else.
How to Identify a German Cockroach
- Size: about ½ inch as an adult. Babies (nymphs) are smaller, darker and wingless.
- Color and marks: light brown or tan with two dark stripes on the shield behind the head.
- Where: kitchens and bathrooms: behind the fridge and stove, under the sink, in cabinet hinges, the dishwasher and the microwave.
- Not the same as: the 1½-inch reddish-brown American cockroach that comes up drains from the sewer. See types of cockroaches in Arizona.
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Signs of a German Cockroach Infestation
- Roaches out in daylight, or several at once when you turn on the kitchen light at night.
- Pepper-like droppings in drawers, cabinet corners and along the top of the fridge door.
- Tan, purse-shaped egg cases (about ¼ inch) in cracks and behind appliances.
- Shed skins and small dark nymphs, which mean they are breeding inside.
- A musty smell in cabinets when the problem is large.
To check, put sticky traps where the floor meets the wall, inside cabinets and behind the fridge and stove. The UC Statewide IPM Program says many roaches are caught in the first 24 hours, and counting before and after treatment shows whether it's working.
How to Get Rid of German Roaches: Steps That Work
- Take away food. Store food in glass jars or sealed plastic, keep trash in a can with a tight lid, and clean up crumbs and grease behind and under appliances (UC IPM; University of Arizona Extension).
- Take away water. Fix dripping faucets and leaks under sinks and around the dishwasher, and don't leave dishes or pet water out overnight.
- Use gel bait, not spray. Put small dabs of cockroach gel bait in cracks, hinges and corners where roaches hide, or use bait stations. Don't spray around the bait: UC IPM notes sprays can repel and scatter roaches, which keeps them away from it.
- Skip the foggers. They don't reach the cracks where German roaches breed and can be a fire hazard (UC IPM).
- Vacuum. Vacuum cracks and corners to pick up roaches, droppings and egg cases, and empty the vacuum outside.
- Check it worked. Keep sticky traps out for a few weeks. If the counts aren't falling, the roaches are in places bait from the store can't reach, or they've learned to avoid it.
German Cockroach Treatment in Phoenix: What the Service Does and Costs
A German roach treatment starts by finding where they're living: inside the fridge and stove motors, the dishwasher, cabinet hinges, under the sink and in wall voids. The technician places professional gel baits and crack-and-crevice treatment in those spots, gives you a short list of food, water and clutter fixes, and comes back to re-treat before the next round of egg cases hatches. A one-time diagnostic visit with treatment is $149. The plan is $50/month with treatment every 60 days and free callbacks if roaches come back. Start a plan the same day and your visit fee covers your first 3 months of the plan. See cockroach exterminator service and pest control cost.
Apartments, duplexes and rentals: German roaches move between units through shared walls and plumbing, so the best results come when neighboring units are treated too. Restaurants and commercial kitchens start with a free pre-inspection; see commercial pest control.
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German Cockroach Questions from Arizona Homeowners
How long does it take to get rid of German roaches?
Expect weeks, not a day. Baits are slow on purpose, and the UC Statewide IPM Program says a bait program may take 7 days or longer to show results. Egg cases already in the kitchen hatch about 30 days after they form, so a follow-up treatment matters.
Do bug bombs or foggers kill German cockroaches?
Usually not. The UC Statewide IPM Program says foggers often fail because they don't reach the cracks where German roaches hide and breed, and sprays can scatter roaches into new areas. Gel baits placed in cracks and crevices work better.
Where do German cockroaches come from?
They live indoors and are carried in: in grocery boxes and bags, used appliances and furniture, and through shared walls and plumbing in apartments and duplexes. Unlike the big American "sewer roach," they rarely come in from outside.
Is one German cockroach a sign of an infestation?
Often, yes. They hide by day, so seeing one in daylight or finding small droppings and egg cases usually means more are behind the stove, fridge or cabinets. Sticky traps at the floor-wall line show how many there are.
How much does German roach treatment cost in Phoenix?
A one-time diagnostic visit with treatment is $149. The plan is $50/month with treatment every 60 days and free callbacks if roaches come back. Start a plan the same day and your visit fee covers your first 3 months of the plan. Restaurants and other businesses get a free commercial estimate.