Abstract: The invention relates to a process and a packaging container for the treatment of pupae by means of sterilizing radiation and for the controllable release of the hatched insects. The pupae are packed in the development compartment of the packaging container together with a filler and a coloring matter and are given radiation treatment in this compartment. When the insects hatch, they mark themselves with the coloring matter and move into the storage compartment of the container attracted by the light that shines through openings made for this purpose. This storage compartment is perforated to permit partial or complete opening in order to release the insects.