American Cockroach (Palmetto Bug) in Mobile, AL

Scientific name: Periplaneta americana. Common name: American cockroach, water bug, palmetto bug. Family: Blattidae. Status in Mobile-Baldwin: ubiquitous, primarily outdoor, with strong indoor activity in humid months and after weather events.

Identification

Adults are 1.5–2 inches, reddish-brown, with a pale yellow figure-8 marking on the pronotum (the plate behind the head). Both sexes have full wings and can fly short distances, particularly in warm weather. Nymphs are wingless and progressively darker with each molt. Egg cases (oothecae) are dark brown, about 8 mm long, and contain 14–16 eggs.

Biology and life cycle

Outdoor populations in the Gulf region complete their life cycle in 5–6 months under favorable conditions. Adults live up to 1 year. Females produce 6–14 oothecae over their lifetime, each glued to a protected surface near food and moisture. Activity is nocturnal; daytime sightings indicate either disturbed harborage or population pressure exceeding available shelter.

Habitat and range in Mobile-Baldwin

Outdoors: leaf litter, mulch beds, palm-frond bases (hence ‘palmetto bug’), sewers and storm drains, tree hollows, woodpiles. Indoors: kitchens with persistent moisture, basements, crawlspaces, plumbing chases, bathroom voids, under refrigerators and dishwashers. Active range covers every part of both counties; coastal humidity and the long warm season concentrate population pressure beyond what is typical farther north.

Risk to homeowners

Lower medical risk than German cockroach but real: American cockroaches mechanically vector E. coli, Salmonella, and Staphylococcus by traveling through sewers and contaminated areas before reaching food-prep surfaces. Allergen production in cockroach feces, shed skin, and saliva is well documented as an asthma trigger. The structural signal is more important than the cockroach itself: a sudden indoor American cockroach problem almost always indicates a moisture-source failure (plumbing leak, roof flashing, crawlspace ventilation).

Prevention

Moisture control is everything. Fix plumbing leaks within days. Maintain working gutters. Ensure crawlspace ventilation and intact vapor barriers. Caulk all penetrations where utilities enter the structure (cable, gas, water, AC condensate lines). Replace torn weatherstripping on doors. Keep mulch beds 6 inches off the foundation. Stack firewood 20 feet away and off the ground.

Treatment options

Gel baits at harborage sites (Maxforce, Advion) are the workhorse. Insect Growth Regulator (IGR) sprays interrupt reproduction. Dust applications (boric acid, silica gel) into wall voids and behind appliances kill on contact and persist. ADAI HPC (Household Pest Control) license category covers this work. DIY consumer-grade gels work for light populations; persistent or heavy populations need professional dispatch and a moisture-source diagnostic.

When to call

Daytime sightings, multiple sightings in different rooms, presence of egg cases, or any sighting that coincides with a recent moisture event in the house. Call us: (251) 555-0100.

Related

See: Cockroach Control Mobile · Local palmetto bug behavior · Compare to German cockroach