The Effect of Parasitization by Pimpla turionellae (L.) on the Emergence from the Pupal Case of its Host, Galleria mellonella (L.)

Parasitism of pupae of G. mellonella (L.) by P. turionellae (L.) was found to prevent adult emergence. The effect was manifest within 24 hours of parasitization. Experiments are described which indicated that the source of the factor preventing eclosion of the imago is the developing parasite egg.