Economic impact and management of brown marmorated stink bug, Halyomorpha halys (Stål) (Hemiptera: Pentatomidae), in Oregon hazelnut orchards

Halyomorpha halys (Stål), the brown marmorated stink bug (BMSB, Hemiptera: Pentatomidae), is an invasive pest with established populations in Oregon, USA. This generalist is now a key pest of commercial hazelnuts (Corylus avellana L.) in the state. This insect is one of two key pests that cause direct damage to the crop, by piercing and feeding on the husk and nut. The other key pest in commercial hazelnut production, filbertworm (FBW), Cydia latiferreana (Walsingham) (Lepidoptera: Tortricidae), is a native to western production regions. FBW damage can occur starting in June through September, whereas BMSB presence and damage largely occur during the latter portion of the season in Oregon hazelnut orchards. We studied damage to developing hazelnut kernels resulting from feeding by BMSB and characterized damage throughout the season in controlled experiments. Data from this work demonstrate the significant economic impact of this species on hazelnuts. Seasonal trapping and damage assessments showed that BMSB consistently causes economic damage in Oregon. Data showed 0.25-6% nut damage in the two seasons of trials. Future management of BMSB should focus on biorational strategies in order to maintain biocontrol of other key insects within the main pest complex of hazelnut.