The invasive stink bug Halyomorpha halys, native to East Asia, is a severe agricultural pest of worldwide importance, and chemical insecticides are largely sprayed for its control. Negative impact and failures of chemical pest management led to consider classical biological control as one of the most promising methods in a long-term perspective. The Asian egg parasitoid Trissolcus japonicus is the main candidate biocontrol agent of H. halys, but more recently a second species, Trissolcus mitsukurii, which shares the area of origin with H. halys, has drawn special attention after adventive populations were found in Europe. Despite its recent detection, intentional release or redistribution are bound to approval of national petitions, which requires detailed risk analyses. With the aim of providing a contribution for the future development of a risk assessment for release purposes, here we present the first study on the physiological (fundamental) host range of T. mitsukurii in Europe. Tests conducted on different hemipterans common to Southern Europe, using three different experimental designs, revealed a oligophagous host range, limited to Pentatomoidea and comparable with the host range displayed by T. japonicus under similar laboratory conditions. In addition to its coevolved host H. halys, T. mitsukurii successfully parasitized the majority of tested pentatomid species and one scutellerid, although with highly variable emergence rates. Notably high parasitization rates were detected on H. halys, Acrosternum heegeri and Dolycoris baccarum. Host egg sizes positively affected parasitoid size and female egg load. Although T. mitsukurii might be a promising biological control agent of H. halys in Europe, further studies (e.g., chemical ecology, field parasitism) are needed for assessment of non-target risks.

入侵性臭虫Halyomorpha halys原产于东亚，是一种具有世界重要性的严重农业害虫，主要喷洒化学杀虫剂以控制其控制。化学害虫管理的负面影响和失败导致将经典生物防治视为从长远来看最有前途的方法之一。亚洲卵寄生蜂Trissolcus japonicus是H. halys的主要候选生物防治剂，但最近出现了第二个物种Trissolcus mitsukurii，它与H. halys共享原产地，在欧洲发现外来种群后引起了特别关注。尽管最近被发现，故意释放或重新分发必须得到国家申请的批准，这需要详细的风险分析。为了为释放目的的风险评估的未来发展做出贡献，我们在这里介绍了关于欧洲mitsukurii生理（基本）宿主范围的第一项研究。使用三种不同的实验设计对南欧常见的不同半翅目动物进行的测试揭示了寡食宿主范围，仅限于 Pentatomoidea，与T. japonicus在类似实验室条件下显示的宿主范围相当。除了共同进化的宿主H. halys之外，T. mitsukurii成功寄生了大多数测试过的五角类物种和一种 scutellerid，尽管出现率差异很大。在H. halys、Accrosternum heegeri和Dolycoris baccarum上检测到显着的高寄生率。寄主卵的大小对寄生蜂的大小和雌性卵负荷产生积极影响。尽管T. mitsukurii在欧洲可能是一种很有前途的H. halys生物防治剂，但需要进一步研究（例如，化学生态学、田间寄生）来评估非目标风险。