Abstract: Such production unit comprises namely an incubator (1) with ventilated housing comprising horizontal alveoli elements, a hatchery (2) containing said alveoli elements arranged vertically and provided with an inlet of carbonic acid gas, a laying place (5) comprising an arrangement of vertical thin plates at right angles with an outlet hopper towards a collecting member (6) and pneumatic transport conduits (7,8). Application to the production of eggs of the meal pyralis genus, intended to be used as substitution host particularly for trichogrammidae.