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The invasive and highly polyphagous brown marmorated stink bug,    Halyomorpha   halys    (Stål), is a severe agricultural and urban nuisance pest in North America. Since its initial invasion into Utah in 2012,    H.   halys    has become well established in urban and suburban locations along the western foothills of the Wasatch Front in northern Utah. Bordering the Great Basin Desert, this area is unique from other North American locations with    H.   halys    due to its high elevation (&gt; 1200 m), aridity (30-year mean RH = 53.1%; dew point = -1.9 °C) and extreme temperatures (the 30-year mean minimum and maximum in January and July in Salt Lake City range from -3.1 to 3.6 °C and 20.3 to 32.4 °C, respectively). To document which plant species harbour    H.   halys   , surveys were conducted in 17 urban/suburban sites in four counties during 2017 and 2018.    Halyomorpha   halys    was more abundant in Salt Lake and Utah counties than in the more northern counties of Davis and Weber and was found on 53 plant species, nine of which hosted two or more developmental stages in both years. The majority of hosts were in the families   Fabaceae  ,   Rosaceae   and   Sapindaceae  . Northern catalpa,    Catalpa   speciosa    (Warder), was the most consistent host, supporting a majority of    H.   halys    detections in all life stages; thus we identify it as a sentinel host. Twenty-nine species were novel hosts for    H.   halys    in North America; of these,    Acer   ginnala    Maxim,    Populus   tremuloides    Michx.,    Prunus   armeniaca   ×   domestica    ‘Flavor King’ and    Prunus   virginiana    ‘Schubert’ were detected with two or more life stages of    H.   halys    in both years. Peak populations of    H.   halys    occurred from mid-June to mid-September. We describe    H.   halys    plant utilisation by life stage and seasonal period to aid future detection and management of this invasive insect in the greater Intermountain West region.

Urban host plant utilisation by the invasive Halyomorpha halys (Stål) ( Hemiptera , Pentatomidae ) in northern Utah