Halyomorpha halys (Stål), an introduced stink bug pest, was evaluated against a range of technical grade insecticides.  Field populations of H. halys were collected from an organic Paulownia tomentosa grove in Allentown, PA during the summer and fall of 2005.  Toxicity to field collected individuals was compared to individuals reared in the laboratory for seven generations.  Field collected males and females and laboratory reared fifth instars and 7-10 day old males and females were evaluated in a glass-vial bioassay.  Mortality values obtained were used to determine LC₅₀ values for phosmet, carbaryl, fenpropathrin, b-cyfluthrin, cyfluthrin, deltamethrin, bifenthrin, lambda-cyhalothrin, acetamiprid, dinotefuran and azadrachtin.  This study provides the first look at insecticide toxicity to H. halys since its introduction into the United States and establishes baseline mortality data.  Halyomorpha halys is already a large nuisance to homeowners in the North East and is emerging as a pest of a wide range of fruit and vegetable crops.  Data from this study will be used to develop control methods for established IPM programs and pest control operators and can be used for future studies on resistance mechanisms in H. halys and other pentatomids.  Results will be discussed.