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Pest Guide

Cockroaches

A health pest that hides and multiplies.

Cockroaches are more than unsettling — they're a documented trigger for asthma and allergies, especially in children. For every roach you see in daylight, many more are tucked into the warm, damp voids of your home.

Where they come from

The German cockroach, the small species that infests kitchens and bathrooms, likely originated in Southeast Asia and is now the most common indoor roach in the world. The larger American cockroach came from Africa and favors sewers, drains, and crawlspaces, while the Oriental cockroach seeks out cool, damp areas. All of them thrive wherever warmth, moisture, and food come together.

Life cycle

Cockroaches develop through incomplete metamorphosis — egg, nymph, adult, with no pupal stage. Females carry an egg case, or ootheca, holding 30 to 40 or more eggs. German cockroaches reproduce the fastest of any household roach: under good conditions, a single female and her offspring can produce thousands in a year, which is how a light infestation explodes so quickly.

The damage they cause

Roaches aren't a structural threat, but they are a serious health one. They crawl through drains and garbage and then across food-prep surfaces, spreading bacteria like salmonella and E. coli. Their shed skins and droppings become airborne allergens that trigger asthma attacks, and heavy infestations leave a distinctive musty odor behind.

Warning signs

  • Droppings that look like ground pepper or coffee grounds
  • Small brown egg cases in cabinets, drawers, or behind appliances
  • A musty, oily odor in the kitchen or bathroom
  • Smear marks along surfaces in damp, dark areas
  • Seeing roaches in daylight — usually a sign of a heavy infestation
  • Shed skins near harborage points
How Guardian handles it

We treat roaches where they actually live — using gel baits and precise applications in the wall voids, cracks, and harborage points they hide in, paired with moisture and sanitation guidance to make your home inhospitable to the next generation.

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