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Cockroaches in Delaware
German roaches live indoors year-round; American roaches come in from outside.
| Peak season | Jun – Sep |
|---|---|
| Size | 1/2 – 1 1/2 inches |
| Risk | Health — asthma triggers, contamination |
| Who treats it | Mosquito & Pest Authority (sponsor) |
How to identify them
German cockroaches are tan with two dark stripes behind the head. American cockroaches are large, reddish-brown and often called palmetto bugs.
Cockroaches in Delaware
German roaches spread in apartments, restaurants and through grocery bags and appliances. American roaches move in from sewers and mulch during hot, wet weather.
When they’re active
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What you can do now
- Clean up crumbs and grease; take out trash nightly.
- Fix leaky pipes; roaches need water.
- Use gel bait in cracks, not sprays.
When to call a pro
Call a pro for German cockroaches; they breed quickly and resist store-bought sprays.
Cockroaches: common questions
Are roaches a sign my home is dirty?
Not always. German roaches can arrive in grocery bags and appliances, and American roaches may come in from outside during hot, wet weather. Cleanliness helps but does not guarantee they will stay away.
Why do store-bought sprays not work on German roaches?
German roaches breed quickly and often hide in cracks, so sprays can miss most of them. Gel baits placed in cracks and a professional plan usually work better.
Can roaches affect asthma or allergies?
Roach droppings and body parts are known asthma and allergy triggers for some people. If you have concerns about symptoms, talk to your doctor.
Where in Delaware
Where cockroaches rank on each county’s top-pest list:
- New Castle County Top concern
- Kent County Not in the county top six
- Sussex County Not in the county top six
Towns where cockroaches are on the local top-pest list: