The cockroach is born in an egg case called an "ootheca". The female cockroach does not sit on the eggs until they hatch. She drags her ootheca behind her, attached to the abdomen. Each egg case contains 30 to 40 nymphs that do not hatch out until 10 weeks after being laid.
Between the laying and hatching stages, the nymphs are protected by the ootheca shell, so they are protected from any insecticide that might be sprayed.
Where are the eggs laid? Never in areas where cockroaches congregate. Always in places that are quiet, inaccessible if possible and ideally dark and damp. Human beings often create inaccessible laying sites without being aware of it.
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Last modified: 25/07/00.