none Enter The parasitization of the horse-chestnut leaf miner Cameraria ohridella DESCHKA & DIMIC 1986 (Lepidoptera, Gracillariidae) was investigated at three ecologically different sites in the Hannover area: Springe / Deis-ter, Westfalenhof and Tiergarten in Hannover-Kirchrode. Eclosion experiments from leaf litter were performed to obtain the complete spectrum of parasitoid species and the eclosion-dynamics of moths and parasitoids. For the calculation of the parasitization rate of hibernating pupae, 400 leafs were dissected. Determination of a total of 2.771 parasitoids resulted in 15 species. Minotetrastichus frontalis dominated at all sites, but also Pnigalio agraules and Closterocerus trifasciatus (Hymenoptera: Chalcidoidea) were common in all locations. The subnatural habitat Springe showed the highest diversity of parasitoids, the urban site Westfalenhof the lowest. The highest rate of parasitization of the pupae was found at Westfalenhof, whereas at Springe it was the lowest. Reasons for the locally variable and over all low parasitization rate of C. ohridella and the different dominance of individual parasitoid species are discussed. Chalcidoidea (Terebrantia): [Parasite]. Eulophidae (Chalcidoidea): [Parasite]. Eupelmus urozonus (Eupelmidae): [Parasite]. Pteromalus (Pteromalidae): [Parasite]. Ichneumonidae (Ichneumonoidea): [Parasite]. Colastes braconius (Braconidae): [Parasite]. Cameraria ohridella (Gracillariidae): [Host].