Cockroaches

Sometimes confused with black beetles from the garden, cockroaches are distinguished by their very long whip-like antennae, flat oval bodies and rapid, jerky gait.

The adult German cockroach is 10 to 15mm long. The common or oriental cockroach is 20 to 24mm long. They are rarely able to survive out of doors in the British climate but thrive around the heating ducts and boiler rooms of large centrally heated buildings e.g hospitals, bakeries, hotel and restaurant kitchens, laundries and blocks of flats. They cluster around pipes, stoves and sinks, especially in humid areas.

The German cockroach carries its egg case, a small brown pulse-like capsule, until the 30 or more nymphs are ready to hatch from it. The oriental cockroach deposits its 13mm long egg capsule on packaging, sacking or in suitable dark crevices before the 16 or 18 nymphs hatch out.

Cockroaches grow in stages - from nymphs to maturity in six to twelve months for the oriental cockroach, but only in as many weeks in the case of German cockroach.

Both specimens eat any sort of food and are most active after dark, from their inaccessible harbourage to forage, contamination food and food utensils, or food preparation surfaces as they go. They taint food with an obnoxious smell and may be carriers of various diseases including serious food poisoning.

Remedy

Control of cockroaches is seldom easy because the difficulty of getting the insecticide to the insect. The insecticide ideally should have been sufficient persistence to kill the nymph hatching later from un-hatched egg capsules.


 

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