German Cockroach
(Blattella germanica)
The most common indoor cockroach species, found in kitchens and bathrooms where they multiply rapidly.

Overview
The German cockroach is the most widespread and economically significant indoor cockroach species worldwide. In Bowling Green, they are the number-one cockroach complaint. They reproduce faster than any other residential cockroach — a single female can produce over 300 offspring in her lifetime. They are strongly associated with kitchens, bathrooms, and anywhere food is prepared or stored. Their droppings and shed skins are major triggers for asthma and allergies, especially in children.
Appearance
German cockroaches are relatively small at 1/2 to 5/8 inch long. They are light brown to tan with two distinctive dark parallel stripes running from the back of the head to the base of the wings. While they have fully developed wings, they rarely fly, preferring to run. Nymphs are smaller and darker, nearly black, with a single light stripe down the center of the back.
Habitat
German cockroaches are almost exclusively indoor pests. They thrive in warm, humid environments close to food and water — primarily kitchens and bathrooms. Common hiding spots include behind and under refrigerators, inside dishwashers, in cabinet hinges, behind stove clocks, inside microwave vents, and in cracks near plumbing. They are often introduced through grocery bags, used appliances, and cardboard boxes.
Diet
German cockroaches are omnivorous scavengers that will eat almost anything with nutritional value, including food scraps, grease, soap, toothpaste, glue, and book bindings. They prefer starchy and sugary foods but will resort to feeding on pet food, crumbs in toasters, and grease behind stoves.
Lifecycle
A female German cockroach carries her egg capsule (ootheca) until just before hatching. Each capsule contains 30 to 40 eggs. She can produce 4 to 8 capsules in her lifetime. Nymphs mature in about 60 days, and adults live for approximately 100 to 200 days. A single pair of German cockroaches can theoretically produce over 300,000 offspring in one year under ideal conditions.
Signs of Infestation
- !Small, dark droppings that resemble ground pepper or coffee grounds on countertops and in drawers
- !A musty, oily odor in heavily infested areas
- !Egg capsules (light brown, purse-shaped) found in cracks and crevices
- !Seeing live cockroaches scatter when turning on lights at night
- !Dark smear marks along edges of walls and counters near hiding spots
Prevention Tips
- ✓Keep kitchen surfaces clean and free of food residue and grease
- ✓Take out trash regularly and use containers with tight-fitting lids
- ✓Fix any leaky faucets or pipes immediately
- ✓Store food in sealed containers rather than open packaging
- ✓Inspect grocery bags, boxes, and used appliances before bringing them indoors
- ✓Seal cracks and crevices around cabinets, pipes, and baseboards
Professional Treatment
Professional German cockroach treatment relies on gel baits strategically placed in cracks, crevices, and harborage areas. Growth regulators are used to prevent nymphs from reaching reproductive maturity. Dust formulations are applied behind outlets and switch plates and inside wall voids. Because of their rapid reproduction, follow-up treatments are critical — typically at 2- and 4-week intervals — to break the breeding cycle completely.
Did You Know?
- •Despite their name, German cockroaches likely originated in Southeast Asia, not Germany.
- •They can hold their breath for up to 40 minutes.
- •Populations have developed resistance to many common insecticides over time.
- •They spend about 75% of their time hiding in cracks and crevices near food and water.
1/2 to 5/8 inch
Light brown to tan with two dark stripes
6
Oval, flat
Kitchen roach, Croton bug
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Other Cockroaches in Our Library

American Cockroach
The largest common cockroach species, often called a "palmetto bug," found in basements and sewer systems.

Oriental Cockroach
Dark, shiny cockroaches strongly associated with moisture, often found in basements and drains.

Smoky Brown Cockroach
Large, strong-flying cockroaches attracted to lights that commonly invade homes from tree canopies.
