German Cockroaches (Blattella germanica)
The German Cockroach (Blattella germanica) is primarily a nocturnal pest and favours warm, humid atmospheres, especially where temperatures are around 25° to 30° C.
The Key Facts About German Cockroaches…
In the UK they prefer heated buildings and are generally not found outside. In buildings German Cockroaches will infest kitchens and bathrooms where they are found near plumbing fixtures, behind appliances, cracks or crevices, cupboards, under drawers and kitchen sinks, and in similar locations.
German Cockroach (Blattella germanica) will often cluster together in favourable harbourages. When severe infestations occur, they may be found in other sections of buildings. They can disperse in large numbers from areas of high population densities to infest other locations.
The adult is about 12-15mm long, light brown or tan, and has two dark longitudinal bands or streaks on the prothorax behind the head. This species has the highest reproductive potential of all the common Cockroaches. The German Cockroach produces about 30 to 50 eggs at a time. The female carries the egg case until the eggs are ready to hatch.
The immature nymph is smaller, dark-coloured with a light-coloured streak running down its back. An immature nymph reaches maturity in about 40 to 125 days. Adult females live about 200 days, producing six to eight egg cases throughout their life.
German Cockroach (Blattella germanica) Significance of Control…
Many people are repulsed and disgusted by the simple presence of German Cockroaches.
However, they are also an important public health risk by contaminating food, surfaces and eating utensils. German Cockroaches are known to carry pathogens, such as Salmonella and E.Coli, which can result in human diseases, such as food poisoning or diarrhea.
Occasionally, German Cockroach (Blattella germanica) will destroy fabric and paper products. In large numbers, they secrete a substance which can result in stains on surfaces they contact and produce disagreeable odours. Finally, products of German Cockroach (Blattella germanica) infestations, including saliva, feces and cast skins, are a source of allergens and can irritate allergies and asthma in people, especially children.
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