in North Italy: Host Specificity and Augmentative Releases against in Hazelnut Orchards.

(Hymenoptera: Scelionidae) emerged from field-laid eggs of (Hemiptera: Pentatomidae) in North Italy, and it emerged in significantly higher numbers from fresh eggs compared to other native scelionids. Since few data on are available, its host-specificity and some biological traits were investigated in laboratory tests, and its impact after augmentative releases was evaluated in two hazelnut orchards. Among the 12 tested bug species (Hemiptera: Pentatomidae, Scutelleridae), only was an unsuitable host, while the highest offspring proportions were obtained from , , and , followed by and . Furthermore, when reared on , showed a high longevity as well as a high adaptation to eggs. In both hazelnut orchards, emerged from eggs after field releases, but it was not found in the next two years. The physiological host range of was quite similar to that of , and probably has just begun to attack as a new host. This aspect needs to be further investigated, as well as its favorable environmental conditions, its distribution and also its possible interaction with , currently present in Italy.