Bed bugs undergo an incomplete metamorphosis during which they pass through five nymphal instars. Each of these nymphal stages needs to feed on blood before it can moult into the next stage and eventually into the adult reproductive form. Both adult males and females then need to continue to take regular blood meals in order to reproduce.
The total development process from egg to adult can take place in as little as 37 days, though often it might take much longer. The adult bed bugs will typically live for about one year, depending upon temperatures and availability of blood meals.
Bed bugs are cryptic insects. This means they spend most of their life hidden away in cracks and crevices where they will not be seen or disturbed. This lack of activity often prevents bedbugs from coming into contact with fresh insecticide residues applied to mattresses, bed stands, box springs, walls, floors or other surfaces upon which they normally travel.
Typically they will emerge between midnight and five in the morning, when people are in a deep sleep, in search of their blood meal. They will travel over several metres in a random manner in search of a host. They are attracted by heat and carbon dioxide given off by resting people, but usually they need to be within 1 m of the source to detect this.
Bed bugs mate by a technique referred to as traumatic insemination. The male bed bug literally stabs his reproductive organ into the female’s body wall where it penetrates a specialised organ on her right side, known as the Organ of Berlese.
The number of eggs that a female will lay is dependent on the number of blood meals she obtains and the ambient temperature. On average a female bed bug will lay between 1 – 7 eggs a day for up to ten days after each blood meal. Typically she will produce around 110 eggs in her life and these will hatch 50:50 into males and females. This means a bed bug population can double in as little as 16 days in optimal conditions.