German Cockroach

Appearance:

  • Adults – 12 – 15mm long.
  • Pronotum yellow with 2 dark brown stripes.
  • The wings are as long as the body or slightly overlapping on males.
  • Long antennae and spiny legs with 2 anal cerci visible on females.

Lifecycle:

  • Eggs – Each ootheca (egg case) is around 6mm long and contains 30 – 40 eggs.
  • Females carry the ootheca until just before it hatches – some 2 – 4 weeks later.
  • Nymphs – will hatch and pass through 5-7 moults before reaching maturity. This is hugely influenced by temperature.
  • Adults – emerge between 2 ½ months and 6 months later usually living for around 6 months.

Habits & Behaviour:

  • Being nocturnal they hide in the cracks and crevices around sinks, cookers and motor compartments of house hold appliances.
  • They can scale rough and smooth surfaces.
  • Mostly found in the heated areas of buildings such as kitchens and boiler rooms as they need high temperatures for optimum breeding.
  • Being omnivorous they scavenge for organic material.
  • They also need to be near a water source for regular drinking.
    Cockroaches are very common in commercial premises associated with the production or handling of food.
  • Egg cases or adults can be transported into your premises on incoming crates, packaging and laundry.

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Oriental Cockroach

Appearance:

  • Adults – 17 – 30 mm long.
  • Their colour is a dark brown almost shiny black.
  • Head tucked beneath pronotum, long antennae and spiny legs with 2 anal cerci.
  • It is dangerous to swat a wasp near its nest site or to attempt to remove the nest yourself, as wasps can sting repeatedly.
  • The wings are undeveloped in female but on the male they cover two-thirds of his abdomen.

Lifecycle:

  • Eggs – ootheca (around 5 laid at intervals by female) each contain on average 16 eggs.
  • These are deposited when they are fully formed in harbourages. Incubation is 6 – 12 weeks later dependent on temperature.
  • Nymphs – progress through 7-10 moults before reaching maturity. Developing into adults may take up to 18 months.
  • Adults – can live up to 6 months.

Habits & Behaviour:

  • Cockroaches are very common in commercial premises associated with the production or handling of food.
  • Egg cases or adults can be transported into your premises on incoming crates, packaging and laundry.
  • They can survive lower temperatures than other cockroaches so can also be found outdoors.
  • Mostly found less cooler, less humid areas such as basements and drains.
  • Oriental cockroaches can climb rough but not smooth vertical surfaces.

Important:

  • Can spread various human diseases by walking over food and preparation areas.
  • Omnivorous they can survive for longs periods of time on a limited food source.
  • Being nocturnal could mean you do not notice them during the day.