Palmetto Bugs in Tampa: What They Are
A palmetto bug is an American cockroach. It is large, one and a half to two inches, reddish brown with a pale figure eight pattern behind the head, and it flies. It lives outdoors in mulch, palm boots, sewer lines and attics, and it wanders into your house through gaps. It does not breed in your kitchen, which is why the treatment is perimeter work and sealing rather than indoor baiting.
How to identify it
Size gives it away. An American cockroach is one and a half to two inches long, glossy reddish brown, with a yellowish figure eight or halo marking on the shield behind its head. Wings cover the whole abdomen on adults and they can glide. The egg case is a dark brown capsule about the size of a grain of rice, often glued into a crack or behind a cabinet.
Two other large roaches behave much the same way. The smokybrown cockroach is a uniform dark mahogany with no pattern and is common in attics and around wood piles.
Where they show up and why
Outside they live in mulch beds, palm boots, tree holes, sewer lines, storm drains, meter boxes, wood piles and under the lanai slab. Inside they turn up in the garage, the water heater closet, under sinks, in the laundry, around floor drains and in the attic.
They come in for water first. A leaking hose bib, damp mulch against stucco, a blocked gutter, a dry floor drain or condensation under a sink is what brings them to the wall. Then they use whatever opening is there: a door sweep that has worn away, an unscreened weep hole, the A/C lineset penetration, or the gap where a water line enters.
What works, and what does not
A treated band around the outside of the house is the core of it, along with the door thresholds, the garage seal, the slab edge and every utility penetration. Then the harborage: mulch pulled back off the wall, palm boots cleaned out, wood piles moved off the ground, gutters cleared and leaks fixed.
Indoor gel bait placed in cracks and voids handles what is already in the garage or the water heater closet. Broad indoor spraying does not help, because the population lives outside.
The foggers and total release cans sold for kitchens are aimed at a different insect entirely. They put product on surfaces you touch and they do nothing about the mulch bed the roaches are actually living in.
Common questions
Does seeing one mean the house is infested?
Usually not. American cockroaches live outside and come in one or two at a time through a door gap, a weep hole or a plumbing penetration. Seeing several a week, or seeing them in daylight, suggests a harborage close to the house or a population that has settled in the attic or a wall void. That is worth an inspection.
Why are they always in the bathroom?
Water and route. They travel plumbing lines and sewer laterals, and they come up through floor drains, under vanities and around tub plumbing that passes through a slab. A dry P-trap in a guest bathroom nobody uses is an open door. Running water in unused drains once a week closes it.
Do they fly at you on purpose?
No, though it feels personal. They glide rather than fly properly, and they head for light or for the nearest dark gap, which sometimes means past your head. They are not aggressive and they do not bite. They do track bacteria across surfaces, so anywhere one has walked is worth wiping down.