(Blattella germanica)
Identification
The German cockroach is light brown to tan with two dark parallel stripes running down its back. Adults typically measure 0.5 to 0.6 inches in length. They have six legs, long antennae, and an oval-shaped body. Although they possess wings, they rarely fly and prefer to run. This species is commonly found worldwide, particularly in urban environments.
Lifecycle & Reproduction
German cockroaches undergo incomplete metamorphosis with three stages: egg, nymph, and adult. Females carry egg cases (oothecae) containing 30–40 eggs until just before hatching. Nymphs emerge and molt multiple times before reaching adulthood in about 40–60 days. Adults live up to six months and reproduce rapidly, leading to severe infestations.
Habits, Diet & Behavior
Nocturnal by nature, German cockroaches are highly active at night, scavenging for food and water. They consume a wide range of organic materials, including starches, grease, meats, and sweets. They are rapid runners and tend to cluster in warm, humid environments near food sources.
Where You’ll Find Them / Typical Locations
German cockroaches thrive in kitchens, bathrooms, and other areas with access to food and moisture. Common hiding spots include:
- Behind appliances (stoves, refrigerators, dishwashers)
- Inside cabinets and pantries
- Under sinks and near plumbing fixtures
- Within cracks and crevices of walls and furniture
Threats & Danger
German cockroaches are known carriers of pathogens, spreading bacteria such as Salmonella and E. coli, which can contaminate food and surfaces. Their shed skins and feces may trigger allergic reactions and asthma, particularly in children.
Prevention
- Seal cracks and crevices to eliminate entry points
- Maintain a clean kitchen and store food in airtight containers
- Regularly empty trash bins and avoid leaving dirty dishes out
- Reduce humidity levels and fix leaks to remove water sources
Signs of Infestation
- Presence of live cockroaches, especially at night
- Small, dark fecal droppings resembling black pepper or coffee grounds
- Egg cases (oothecae) found in hidden areas
- A musty, unpleasant odor in infested locations
How to Get Rid of It
- Use bait stations, gel baits, and insecticidal dust to target roaches in hiding spots
- Apply insect growth regulators (IGRs) to disrupt reproduction
- Clean and sanitize affected areas to remove attractants
- Seek professional pest control services for severe infestations