Here, we document the first record for Montana of Halyomorpha halys (Stål) (Hemiptera: Pentatomidae), a major agricultural and nuisance pest in many parts of the world. The insect was found overwintering in a private residence in January 2021 in Billings (Yellowstone Co.). A preliminary survey of sites in Billings from May to October 2021 confirmed the presence of H. halys within a radius of at least 11 km from the January detection. Putatively overwintering H. halys and adult bugs found across the city of Billings in the summer suggest the insect may have been present in the area prior to 2021. Surveys conducted in various regions of the state between 2013 and 2020 reported no detections of H. halys. Yellowstone Co. was previously surveyed in 2017, indicating the species likely arrived between 2018 and 2020 or was present before 2018 at densities too low to be detected. The summary of presence and absence records we provide herein is valuable for future monitoring and management efforts of this economically important species.

中文翻译：

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美国蒙大拿州 Halyomorpha halys（半翅目：Pentatomidae）的首次报告

在这里，我们记录了蒙大拿州 Halyomorpha halys (Stål)（半翅目：Pentatomidae）的第一个记录，这是世界许多地方的一种主要农业和公害害虫。该昆虫于 2021 年 1 月在比林斯（黄石公司）的一处私人住宅中被发现越冬。从 2021 年 5 月到 2021 年 10 月对比林斯的地点进行的初步调查证实，H. halys 在 1 月检测到的至少 11 公里半径内存在。夏季在比林斯市发现的推定越冬 H. halys 和成虫表明该昆虫可能在 2021 年之前就已经存在于该地区。2013 年至 2020 年期间在该州不同地区进行的调查报告没有检测到 H. halys . Yellowstone Co. 此前曾在 2017 年接受过调查，表明该物种可能在 2018 年至 2020 年之间到达，或者在 2018 年之前以低到无法检测到的密度存在。我们在此提供的存在和缺失记录摘要对于未来对该经济上重要物种的监测和管理工作很有价值。