Abstract The samurai wasp, Trissolcus japonicus, is the primary natural enemy of the invasive brown marmorated stink bug, Halyomorpha halys, in its native range of Asia. Laboratory tests have found that the wasp can parasitize numerous native pentatomid species in North America, yet many potentially influential factors involved with T. japonicus host acceptance and host suitability are understudied. In this study we evaluated the effects of host-related semiochemicals and parental host species on T. japonicus host foraging behavior and host parasitism. To address possible influences of parental host species, separate parasitoid lines were established using H. halys and native predatory pentatomid Podisus maculiventris eggs as hosts. Female T. japonicus from both host types were exposed to soybean (Glycine max) leaf surfaces contaminated by adult kairomones of either host species in behavioral assays. Females from each host type were also subject to no-choice tests in which they were exposed to either H. halys or P. maculiventris egg masses in large mesh cages. Each female used in the no-choice tests was weighed and their right hind tibiae were measured to identify possible phenotypic plasticity. Results from the behavioral assays suggest that T. japonicus exhibits some degree of host fidelity while searching for hosts. Females which emerged from P. maculiventris eggs resided for equal amounts of time on leaves contaminated with kairomones from either stink bug species. Differences in no-choice test performance were not found between the two host types, as parasitism rates and host suitability were determined to be dependent on exposed host species and not the parasitoid parental host species. T. japonicus which emerged from H. halys possessed longer right hind tibiae and weighed roughly twice as much as wasps which emerged from P. maculiventris.

中文翻译：

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亲本宿主物种通过五足卵寄生蜂 Trissolcus japonicus（膜翅目：Scelionidae）影响行为和寄生

摘要 武士黄蜂 Trissolcus japonicus 是入侵的棕色獾臭虫 Halyomorpha halys 的主要天敌，它位于亚洲的原产地。实验室测试发现，黄蜂可以寄生在北美的许多原生五足类物种，但与 T. japonicus 宿主接受度和宿主适用性有关的许多潜在影响因素尚未得到充分研究。在这项研究中，我们评估了宿主相关信息素和亲本宿主物种对 T. japonicus 宿主觅食行为和宿主寄生的影响。为了解决亲本宿主物种的可能影响，使用 H. halys 和本地捕食性五角蜂 Podisus maculiventris 卵作为宿主建立了单独的拟寄生物系。女T。在行为分析中，来自两种宿主类型的 japonicus 暴露于大豆（Glycine max）叶子表面，这些叶子表面被任一宿主物种的成虫 kairomone 污染。来自每种宿主类型的雌性也接受了无选择测试，其中它们在大网状笼子中暴露于 H. halys 或 P. maculiventris 卵群。对无选择测试中使用的每只雌性进行称重，并测量它们的右后胫骨以确定可能的表型可塑性。行为分析的结果表明 T. japonicus 在寻找宿主时表现出一定程度的宿主保真度。从 P. maculiventris 卵中出现的雌性在被任一臭虫物种的 kairomones 污染的叶子上停留相同的时间。两种主机类型之间未发现无选择测试性能的差异，因为寄生率和宿主适宜性被确定取决于暴露的宿主物种，而不是寄生的亲本宿主物种。从 H. halys 出现的 T. japonicus 拥有更长的右后胫骨，重量大约是从 P. maculiventris 出现的黄蜂的两倍。