Adventive populations of Trissolcus japonicus (Ashmead) have been detected in the eastern and western United States including the western states of Washington, Oregon, California, and Utah. These populations may provide classical biological control for the invasive brown marmorated stink bug, Halyomorpha halys (Stål), which can cause economic loss to many specialty crops in western North America. Idaho has not previously been surveyed for the exotic T. japonicus or native parasitoids of H. halys. In July 2021, T. japonicus was discovered emerging from wild H. halys egg masses in Star, Idaho (43.69788, −116.49427), and was detected on yellow sticky cards from July to September. This is the first record of T. japonicus in the state of Idaho. T. japonicus constituted only a small portion of Trissolcus species detected; other species included T. euschisti (Ashmead), T. hullensis (Harrington), and T. utahensis (Ashmead). Genetic population level analysis of T. japonicus specimens from Idaho supports the likelihood of its expansion inland from the west coast, inhabiting ecozones previously considered unsuitable due to high temperatures and low humidity. This report opens the prospect of an effective biological control agent for H. halys in Idaho and potentially other hot and dry geographic regions and expands documentation of the presence of adventive T. japonicus populations in North America.

中文翻译：

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Trissolcus japonicus（膜翅目：Scelionidae）的外来种群，Halyomorpha halys 的寄生蜂（半翅目：Pentatomidae），在爱达荷州西南部发现

在美国东部和西部，包括西部的华盛顿州、俄勒冈州、加利福尼亚州和犹他州，已检测到日本刺参（Ashmead）的外来种群。这些种群可能为侵入性褐栗色臭虫 Halyomorpha halys (Stål) 提供经典的生物控制，这可能会给北美西部的许多特种作物造成经济损失。爱达荷州以前没有调查过外来的日本刺参或 H. halys 的本地寄生蜂。2021 年 7 月，在爱达荷州斯塔尔 (43.69788, −116.49427) 的野生 H. halys 卵块中发现了 T. japonicus，并在 7 月至 9 月期间在黄色粘性卡片上检测到。这是爱达荷州首次记录日本刺参。T. japonicus 仅占检测到的 Trissolcus 物种的一小部分；其他物种包括 T。euschisti (Ashmead)、T. hullensis (Harrington) 和 T. utahensis (Ashmead)。来自爱达荷州的 T. japonicus 标本的遗传种群水平分析支持其从西海岸向内陆扩张的可能性，居住在以前因高温和低湿度而被认为不适合的生态区。该报告开启了在爱达荷州和其他潜在的炎热干燥地理区域为 H. halys 开发一种有效生物控制剂的前景，并扩大了北美外来 T. japonicus 种群存在的记录。由于高温和低湿度，居住在以前被认为不适合的生态区。该报告开启了在爱达荷州和其他潜在的炎热干燥地理区域为 H. halys 开发一种有效生物控制剂的前景，并扩大了北美外来 T. japonicus 种群存在的记录。由于高温和低湿度，居住在以前被认为不适合的生态区。该报告开启了在爱达荷州和其他潜在的炎热干燥地理区域为 H. halys 开发一种有效生物控制剂的前景，并扩大了北美外来 T. japonicus 种群存在的记录。