A very few insects are unwelcomed in homes, and cockroaches are always on top of the list. They can contaminate food with their feces and carry disease-causing bacteria on their bodies. Once cockroaches find a place they like, they tend to reproduce very quickly, and it gets challenging to get rid of them.

There are around more than 4,000 cockroach species, and the German roaches are the most common of them that can be found indoors. They are known to be the cockroach of concern and have given a bad name to all other cockroaches species. The German cockroaches are known to be challenging pests for many experts because of their biology and habits.

How German roaches reproduce?

Usually, the German roaches die younger than the other species of roaches, as they have a lifespan of around 20 weeks, but they do have huge families. They are light brown, around 1/2 inch in length, and have two lengthwise black stripes behind the heads.

German cockroaches mature so quickly that they start to make babies of their own within a few weeks after hatching. When we consider all the different generations of the German roaches, we find out that one female roach can be the matriarch of around 35,000 roaches.

This means that they will be spreading rapidly throughout the entire building if they appear in one apartment or home. In the lifetime of a German female roach, it produces around seven egg capsules, whereas each capsule has 48 eggs in it. Until the eggs start to hatch, these capsules stay attached to the mother roach.

German roach distribution

German roaches can be seen everywhere in the world and are associated with humans. These roaches cannot survive in places that have no humans or human activity. Cold temperatures are among the significant factors that limit the survival of these roaches, as studies have shown that German roaches cannot colonize inactive ships when the temperatures are cold and cannot survive in homes without central heating. To establish the population and limited growth, the availability of food, water, and harborage also play a significant role.

German roach description

  • Egg

The German roach eggs are carried in an egg case by the female until the eggs hatch. The egg case or ootheca can typically be seen protruding from the genital chamber of the female roach. Usually, the nymphs start to hatch from the ootheca while the female still carries it.

  • Larva or Nymph

The German roach’s nymphal stage begins with the egg hatch and ends till the roach becomes an adult. The nymphs are generally black to dark brown and have dark parallel bands running the length. The number of molts varies, but the most frequent number is six to reach the adult stage.

  • Adult

The adult German roach is around 10-15mm in length and is brown to dark brown. The male roach has a thin body and slender; the abdomen’s terminal segments are visible and have a tapered posterior abdomen. The female roach has a rounded posterior abdomen, has body stout, and tegmina cover its entire abdomen.

German roach lifecycle

The entire cycle of the German roach can be completed in around 20 weeks; however, there are many factors like nutritional status, temperature, and strain differences that may influence the time required to complete its life cycle.

These roaches breed continuously, and therefore, at one time, there might be many overlapping generations present. Their population grows exponentially under the ideal conditions, and the field of populations that grow actively comprises around 80% nymphs and 20% adults. It is worth noting that the German roach is omnivorous and can eat pet food, table scraps, and even book bindings.

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