German Cockroach

German Cockroaches Scientific Name: Blattella germanica Size 13-16mm


Biology: The reason that German cockroaches are such successful breeders is they carry the egg case (Ootheca) until 1-2 days within hatching. Each egg case produces between 30-40 eggs and they can produce up to 8 cases a year. Development time from egg to adult varies between 54-215 days depending upon the environment. Adults can live on average 200 days.

Habits: German cockroaches are found throughout structures but have a preference for warm (21C) and humid places. They are usually found in kitchens and bathrooms, but they also occur in the lounge and bedroom etc. Any crack or crevice they will use as harborage. For young adults (Nymphs) they need a crack of only 1mm adult’s needs only 5mm. They feed on almost anything including all kinds of food, and such things as soap, glue and toothpaste. Because of the way they spend their time in the harborage about 30% of the young nymphs will not be seen during an inspection.

Treatment: The treatment for cockroaches can take several visits to eradicate a current infestation, especially if it has been left to worsen with time. After a full inspection of the property a full insecticidal spray is carried out in all the badly affected areas, along with a gel bait insecticide applied in all areas where the cockroaches are active. Large insect monitors are also put down to trap as many as possible, the insect monitors play a vital roll through out the treatment as on each visit they are inspected and when we finally find no cockroaches on the monitors, we can determine that the infestation is cleared. Once the treatment has been carried out it is advised that the areas treated cannot be cleaned for at least 2-3 weeks and any dead roaches found after the treatment are left alone as other cockroaches will eat them and ingest the insecticide and die as a result of second generation poisoning.

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