The highly polyphagous and invasive brown marmorated stink bug, Halyomorpha halys (Stål) (Hemiptera: Pentatomidae), has become a significant insect pest in North America since its detection in 1996. It was first documented in northern Utah in 2012 and reports of urban nuisance problems and plant damage have since increased. Biological control is the preferred solution to managing H. halys in North America and other invaded regions due to its alignment with integrated pest management and sustainable practices. Native and non-native biological control agents, namely parasitoid wasps, have been assessed for efficacy. Trissolcus japonicus (Ashmead) (Hymenoptera: Scelionidae) is an effective egg parasitoid of H. halys in its native range of southeast Asia and has recently been documented parasitising H. halys eggs in North America and Europe. Field surveys for native and exotic egg parasitoids using wild (in situ) and lab-reared H. halys egg masses were conducted in suburban and agricultural sites in northern Utah from June to September 2017–2019. Seven native wasp species in the families Eupelmidae and Scelionidae were discovered guarding H. halys eggs and adult wasps from five of these species completed emergence. Native species had low mean rates of adult emergence from wild (0.5–3.7%) and lab-reared (0–0.4%) egg masses. In 2019, an adventive population of T. japonicus was discovered for the first time in Utah, emerging from 21 of the 106 wild H. halys egg masses found that year, and none from lab-reared eggs. All T. japonicus emerged from egg masses collected on Catalpa speciosa (Warder). Our results support other studies that have observed biological control of H. halys from T. japonicus and improved parasitoid wasp detection with wild as compared to lab-reared H. halys egg masses.

中文翻译：

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在犹他州北部对 Halyomorpha halys (Stål) (Hemiptera: Pentatomidae) 的卵寄生物进行的调查发现 Trissolcus japonicus (Ashmead)（膜翅目：Scelionidae）。

自 1996 年被发现以来，高度多食性和侵入性的棕色marmorated 臭虫 Halyomorpha halys (Stål)（半翅目：五足科）已成为北美的一种重要害虫。它于 2012 年首次在犹他州北部被记录，并有城市滋扰的报道自那以后，问题和植物损害增加了。生物防治是管理北美和其他入侵地区的 H. halys 的首选解决方案，因为它与综合害虫管理和可持续实践相一致。本地和非本地生物控制剂，即寄生蜂，已经过有效性评估。Trissolcus japonicus (Ashmead)（膜翅目：Scelionidae）是其东南亚本土范围内的 H. halys 的有效卵寄生物，最近有记录表明寄生在北美和欧洲的 H. halys 卵。2017-2019 年 6 月至 2019 年 9 月，在犹他州北部的郊区和农业场所使用野生（原位）和实验室饲养的 H. halys 卵群对本地和外来卵寄生物进行了实地调查。发现了 Eupelmidae 和 Scelionidae 科的七种本地黄蜂物种，它们保护着 H. halys 的卵，其中五个物种的成年黄蜂已完成出现。本地物种从野生 (0.5-3.7%) 和实验室饲养 (0-0.4%) 卵块中成虫的平均出现率较低。2019 年，首次在犹他州发现了 T. japonicus 的新种群，该种群来自当年发现的 106 个野生 H. halys 卵群中的 21 个，而没有来自实验室饲养的卵。所有 T. japonicus 都来自在 Catalpa speciosa (Warder) 上收集的卵块。我们的结果支持其他研究，这些研究已经观察到对来自 T. halys 的 H. halys 的生物控制。