Host stage preference, efficacy and fecundity of parasitoids attacking Drosophila suzukii in newly invaded areas

•Populations of two parasitoids of Drosophila suzukii were tested under laboratory conditions.•Only the Italian population of Leptopilina heterotoma parasitized D. suzukii.•Italian and North American populations of Pachycrepoideus vindemiae parasitized D. suzukii.•Host pupal preference and lifetime fecundity of P. vindemiae were determined.•A third parasitoid species, Trichopria drosophilae, showed the ability to parasitize D. suzukii.