What a cockroach looks like (German vs American)
Adult German cockroaches are tan, about 1/2–5/8 inch, with two dark stripes behind the head. American (palmetto) cockroaches are 1.5–2 inches, reddish-brown, with a pale border on the shield. Photograph the top of the insect next to a coin if you are unsure.
ID first
Identification
Size, stripes, and where you found it
- Most important step
- Identify the species before choosing a treatment
- Small indoor roach
- German cockroach is the common kitchen breeder
- Large reddish roach
- American cockroach often enters from drains or damp exterior sources
- Shared signs
- Droppings, egg cases, shed skins, nighttime activity, and musty odor
Size and markings are more useful than color alone. Photograph the top of the roach beside a coin, or capture one on a sticky monitor. Nymphs can look unlike adults, so include where it was found and whether adults of another size are present.
Signs
Signs of a cockroaches problem
- Night sightings
Cockroaches are mostly nocturnal; inspect kitchens, bathrooms, drains, and utility areas after dark.
- Droppings
German roaches leave pepper-like specks; large species leave larger cylindrical or ridged pellets.
- Egg cases
Ootheca size, color, and placement vary by species but confirm a reproductive source nearby.
- Nymphs
Small wingless juveniles indicate breeding rather than a single accidental intruder.
- Odor and smears
Heavy populations may produce musty odors and dark smears around damp harborages.
Compare
German vs American cockroach
| Trait | German cockroach | American cockroach |
|---|---|---|
| Size | German: 1/2–5/8 inch | American: 1.5–2 inches |
| Markings | German: two dark stripes behind head | American: pale border behind head |
| Main habitat | German: kitchens and bathrooms indoors | American: drains, basements, sewers, and outdoors |
| Infestation clue | German: nymphs and pepper droppings near appliances | American: repeated large roaches near damp routes |
| Treatment focus | German: bait, sanitation, IGR, follow-up | American: moisture, exclusion, source treatment |
DIY that works
What to try before you call
- Capture a specimen
Use sticky monitors in several rooms and compare size, markings, and capture locations.
- Match control to species
Use targeted bait and sanitation for German roaches; prioritize drains, moisture, and exclusion for American roaches.
- Skip foggers
Total-release foggers rarely reach harborages and can scatter indoor-breeding species.
- Measure progress
Date monitors and record weekly catches. Escalate if activity spreads or does not decline.
Handle it yourself if these fit
Retail products can finish it
- An isolated large outdoor roach with a clear entry route
- A very early one-room problem that you can monitor carefully
When to call
Past what DIY reliably reaches
Call a licensed pro if any of these is true
- Nymphs or egg cases are present
- Daytime or multi-room sightings occur
- The source involves shared walls, drains, sewers, or inaccessible voids
- Correctly placed bait does not reduce activity
Cost & prep
What a visit usually looks like
$150–$400
Typical U.S. range for initial cockroach service. Species, infestation level, property size, and required follow-ups affect the final price. Not a quote.
Prep checklist before a tech arrives
- Capture or photograph a specimen if possible.
- Record rooms, times, and approximate sizes seen.
- Remove exposed food and empty trash.
- Clear access under sinks and around major appliances.
- Do not fog or spray before inspection.
FAQ
Common questions about cockroaches
What does a cockroach look like?
Adults are oval and flattened, with long antennae and six spiny legs. German cockroaches are tan, about 1/2–5/8 inch, with two dark stripes behind the head. American cockroaches (palmetto bugs) are 1.5–2 inches, reddish-brown, with a pale border on the shield. Nymphs are smaller and wingless.
How can I tell if a bug is a cockroach?
Look for a flattened oval body, long thread-like antennae, and spiny legs. Size and the markings on the shield behind the head separate common household species. A clear top-view photo next to a coin is more useful than color alone.
What’s the difference between a roach and a cockroach?
There is no species difference. Roach is the informal name; cockroach is the same insect. Identification still depends on size, markings, and where you found it.
Is this a cockroach?
A blurry side photo is often inconclusive. Use the free identify-a-bug tool at /tools/identify, or photograph the top of the insect next to a coin and compare German vs American markings on this page.
How can I tell what kind of cockroach I have?
Compare adult size, markings behind the head, room found, and whether nymphs are present. A specimen or clear top-view photo is more reliable than color alone.
Does one cockroach mean an infestation?
Not always. One large roach may be an outdoor intruder. One German cockroach in a kitchen is more concerning because that species lives and breeds indoors.
What are the clearest signs of a cockroach infestation?
Repeated sightings, nymphs, egg cases, concentrated droppings, shed skins, and a musty odor indicate established activity.
Should I use a cockroach fogger?
Usually no. Foggers do not penetrate most hiding cracks, can contaminate bait, and may drive roaches deeper into walls or adjoining rooms.
What attracts cockroaches?
Food residue, grease, leaking plumbing, condensation, pet food, cardboard clutter, and protected cracks support activity. Entry can still occur in clean homes.
How much does cockroach treatment cost?
A typical initial U.S. service is roughly $150–$400, but German cockroach and multi-unit work may require multiple visits. Pricing varies by property and region.
When is professional treatment necessary?
Professional help is appropriate for breeding populations, multi-room spread, shared-wall properties, recurring drain activity, or DIY treatment that shows no measurable decline.
Related pest guides
All pest guidesCall about cockroaches control
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Disclosure
Not a pest control company. A referral can pay us. DIY steps on this page do not change based on who pays.