How to Get Rid of German Cockroaches

The most effective way to get rid of German cockroaches is a bait-first plan: deep-clean to remove competing food and grease, place small dots of cockroach gel bait in the cracks and hinges where they hide, add an insect growth regulator (IGR) to stop nymphs from becoming breeding adults, and use sticky traps to find hot spots and track progress. Avoid foggers and general-purpose sprays, which scatter roaches and can make baits less attractive. Keep up the plan for at least several weeks, rotate to a different bait active ingredient if roaches stop taking it, and call a licensed pest control company if you are in an apartment building or see no improvement after a month. Here is how to do each step.

Part of our Pest Control guide →

In this guide

1. How to Identify German Cockroaches
2. Why German Cockroaches Are So Hard to Kill
3. Step 1: Find the Hot Spots With Sticky Traps
4. Step 2: Clean and Remove Food and Water
5. Step 3: Apply Gel Bait Correctly
6. Step 4: Add an Insect Growth Regulator
7. Step 5: Use Dusts in Voids
8. Step 6: Monitor and Rotate
9. A Sample Four-Week Plan
10. Why It Is Worth Getting Rid of Them Fully
11. What Not to Do
12. When to Call a Professional
13. Keeping German Cockroaches From Coming Back
14. Frequently Asked Questions

How to Identify German Cockroaches

The German cockroach (Blattella germanica) is the most common indoor cockroach in US homes, apartments and restaurants. Correct identification matters, because the larger outdoor species that wander indoors need a different approach.

Feature	German cockroach	American cockroach	Oriental cockroach
Size	About 1/2 to 5/8 inch	About 1.5 inches or more	About 1 inch
Color	Light brown to tan	Reddish brown	Dark brown to black, shiny
Markings	Two dark parallel stripes behind the head	Yellowish band behind the head	None obvious
Where found	Kitchens, bathrooms, appliances, indoors	Basements, drains, sewers, outdoors	Damp basements, crawl spaces, outdoors
Reproduction indoors	Very rapid	Slower	Slower

Signs of German cockroaches include small dark specks like pepper or coffee grounds along cabinet edges and hinges, a musty odor in heavier infestations, shed skins, and egg capsules. Female German roaches carry their egg capsule until it is nearly ready to hatch, which protects eggs from many treatments. Seeing roaches in daylight usually means the population is large. If you are dealing with larger roaches coming in from outside, our general guide on how to get rid of cockroaches covers those species.

Why German Cockroaches Are So Hard to Kill

• They reproduce quickly. Each egg capsule holds dozens of eggs, and nymphs mature in a matter of weeks in warm kitchens, so populations climb fast.
• They hide in tiny cracks. Their small, flat bodies fit into gaps behind cabinets, inside appliance motors, under sinks and in wall voids.
• Many populations resist common insecticides, especially older pyrethroid sprays.
• Some develop bait aversion, refusing certain bait ingredients, which is why rotating baits matters.
• They spread between units in apartment buildings through plumbing chases and shared walls.

Step 1: Find the Hot Spots With Sticky Traps

Before you bait, find where they are concentrated. Place glue traps along the back edges of counters, under the sink, behind the refrigerator and stove, beside the dishwasher, in corners of cabinets and near the water heater. German roaches like warm, humid spots close to food and water. After a few days, the traps with the most roaches show you exactly where to focus. Keep placing fresh traps every week or two to measure progress.

Step 2: Clean and Remove Food and Water

Sanitation makes bait work. Roaches with plenty of crumbs and grease have less reason to eat bait.

• Degrease the stovetop, range hood, backsplash and the sides of the stove and refrigerator. Pull out appliances and clean behind and under them.
• Store food in sealed containers, including pet food, and do not leave pet bowls out overnight.
• Wash dishes nightly and wipe counters and sinks dry.
• Take out trash daily and use a lidded can.
• Fix leaky faucets and pipes, and do not leave sponges or wet rags in the sink.
• Vacuum visible roaches, droppings and egg capsules with a crevice tool, then empty the vacuum outside.
• Reduce clutter, especially cardboard boxes and paper bags, which provide hiding spots.

Step 3: Apply Gel Bait Correctly

Gel baits combine an attractive food matrix with a slow-acting insecticide. Roaches eat the bait, return to their hiding places and die there, and other roaches are exposed when they feed on droppings or dead roaches. Professional-grade baits are available to homeowners. Common active ingredients include indoxacarb, fipronil, abamectin, imidacloprid, dinotefuran and hydramethylnon. You can find them by searching for cockroach gel bait; choose one labeled for German cockroaches indoors.

• Small and many: place pea-sized or smaller dots, roughly a few inches to a foot apart, in cracks and crevices near harborages, rather than large blobs.
• Where to place: cabinet hinges, the inside corners of cabinets near the top, under sinks along pipes, behind and beneath appliances, along drawer runners, and in gaps around countertops.
• Keep it out of reach of children and pets, and away from food prep surfaces.
• Avoid contamination: do not spray cleaners or insecticides on or near bait.
• Check and refresh: look at placements every week or so. Reapply where bait is eaten or dried out.

Bait stations, small plastic containers of bait, are cleaner and safer around kids and pets and work well alongside gel. Place them flat against walls and in corners where roaches travel.

Step 4: Add an Insect Growth Regulator

IGRs such as hydroprene, pyriproxyfen and methoprene do not kill adult roaches quickly. They interfere with development so nymphs cannot mature into breeding adults, and some cause sterility. Because a German roach population can rebound from a few surviving females, an IGR is one of the most effective additions to a bait program. IGRs come as point-source discs, aerosols or concentrates that can be applied to cracks and crevices. Follow the label for where and how often to apply.

Step 5: Use Dusts in Voids

Dusts such as boric acid, silica gel or diatomaceous earth labeled for roaches work well in wall voids, behind switch plates and outlet covers (with power off), under appliances and in other hidden spaces. Apply a very light film with a bulb duster; roaches avoid thick piles. Never apply dust on countertops or where food is prepared. Our guide on diatomaceous earth for pests covers handling tips.

Step 6: Monitor and Rotate

Keep sticky traps out and replace them regularly. Trap counts should fall steadily over several weeks. If roaches are still active and bait is not being eaten, they may be averse to that formulation. Switch to a bait with a different active ingredient, not just a different brand. Clean up old dried bait before switching. Continue the program for a few weeks after you stop seeing roaches, because egg capsules can still hatch.

A Sample Four-Week Plan

Week	Tasks
Week 1	Set sticky traps; deep-clean kitchen and bathroom; pull and clean behind appliances; apply gel bait and bait stations at hot spots; place IGR; dust wall voids
Week 2	Check traps and count roaches; refresh eaten bait placements; keep nightly cleaning routine; seal obvious gaps under sinks
Week 3	Replace traps; if bait is untouched but roaches remain, switch to a bait with a different active ingredient
Week 4	Compare trap counts to week 1; continue baiting where activity remains; decide whether to call a professional
Ongoing	Keep a few traps out as monitors; refresh IGR per label; stay on top of sanitation

Record trap counts on a sheet of paper taped inside a cabinet door. Seeing numbers fall is the clearest sign the plan is working, and rising or flat counts tell you early that something needs to change.

Why It Is Worth Getting Rid of Them Fully

German cockroaches are more than a nuisance. They travel between garbage, drains and food surfaces and can carry bacteria onto dishes and counters. Their droppings, saliva and shed skins contain allergens that are a well-known trigger for asthma symptoms, particularly in children. That is why stopping at “fewer roaches” is not enough. Keeping the program going until traps stay empty, and then maintaining sanitation and monitoring, protects both your kitchen and your household’s health.

What Not to Do

• Do not use foggers or bug bombs. They do not reach roaches deep in cracks, can scatter them into new areas, and leave residue on surfaces.
• Do not spray repellent insecticides around bait. Many sprays repel roaches from treated areas, including baited cracks.
• Do not rely on spray-only treatment. Contact kills look satisfying but do little to the hidden population.
• Do not stop too soon. A few survivors can rebuild an infestation.

When to Call a Professional

A licensed pest control company is worth calling if you live in an apartment or condo where roaches move between units, if you see roaches in daylight or in many rooms, if your own baiting program has not reduced trap counts after about a month, or if someone in the home has asthma or allergies, since cockroach allergens can trigger symptoms. Professionals have access to more bait formulations and application tools, and in multi-unit buildings they can treat adjoining units at the same time, which is often the only way to succeed. For a sense of budget, see our breakdown of pest control service costs.

Keeping German Cockroaches From Coming Back

• Inspect grocery bags, cardboard boxes, used appliances and secondhand furniture before bringing them in. German roaches often arrive as hitchhikers.
• Seal gaps around pipes under sinks and behind appliances with caulk or expanding foam.
• Keep up nightly kitchen cleaning and store food sealed.
• Leave a few sticky traps in place long-term as an early warning.

For other indoor and outdoor pest problems, our pest control guide covers identification and treatment options.