Aug082014

"The German Cockroach"

GERMAN

GERMAN

German cockroaches are found in the same places as the common cockroach, with one exception, they can walk across ceilings.  Another difference with this species is that the female carries the egg case (Oothecae) around with her until it is just due to hatch whereas the common cockroach is just that and dumps hers after a few hours.  This insect was introduced from N.Africa.  Both sexes can fly but are reluctant to do so.  

The German cockroach is light brown with two dark longitudinal stripes on the thorax. Adults are about 5/8-inch long and both sexes have fully developed wings. The number of eggs in the ootheca varies from 18 to 50 and the female carries the ootheca until shortly before hatching. Female German cockroaches may occasionally help the nymphs emerge from the egg capsule.

The average life cycle takes 60 days at room temperature. The German cockroach is the species most commonly found in households for several reasons: (1) it has a larger number of eggs per capsule, (2) nymphs reach sexual maturity more quickly than other cockroaches, (3) the female carries the egg capsule and protects the embryos until hatching, (4) German cockroaches are small and can conceal themselves easily, and (5) they can rapidly build up resistance to insecticides. This species is very active.

German roaches are often carried from place to place in items such as bagged potatoes and onions, bottle cases and cartons and food packages. They travel readily from one location to another and pass through very small openings.

Places where German cockroaches are found often share many common characteristics; they’ll usually be warm, dark, and have small cracks and crevices or other small openings into dark confined areas. Such places will generally be rather moist or located near water sources and food supplies.

German cockroaches usually cluster closely together. Adult female cockroaches with oothecae are found deeper within a harborage than other life stages. This makes it extremely difficult to eliminate this species unless extreme care is taken in thorough pesticide treatments. In populations which have developed pesticide resistance, individuals may scatter widely throughout a building. Although German cockroaches are normally most active at night in dark areas, people may see them out of their normal hiding places wherever they aren’t disturbed.

A few interesting facts:

  • They are 12 – 15 mm long

  • They are colored light brown with two dark stripes on the thorax.

  • The wings are as long as the body, and overlap in both sexes.

  • The oothecae is carried by the female until  hatching is imminent.

  • The female produces 4 – 8 oothecae in her lifetime.

  •  In this species, the oothecae contain 35 – 40 eggs.

  • The hatching time is only one month.

  • The nymph achieves adulthood in 5 – 7 moults, remember cockroaches don’t pupate.

  • The nymphal development can be as quick as 6 weeks, but can take up to 6 months.

​Click here to learn more about the cockroaches most common to Virginia.

Click here to learn about roaches and childhood asthma.

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