“…The neonicotinoid‐susceptible, North Carolina State University laboratory F. fusca colony (NCSU) was maintained in the laboratory under the same conditions as the field populations. Thiamethoxam and imidacloprid resistance was characterized in each population using the multiple‐dose, diet‐based bioassay approach described in Huseth et al Briefly, eight adult female F. fusca were placed in 1.5‐mL microcentrifuge tubes (#05–408‐130; Fisher Scientific, Pittsburgh, PA, USA) capped with a sachet constructed using the excised cap of the tube and a 2 × 2 cm square of Parafilm (#PM992; Bemis Co., Neenah, WI, USA). The sachets contained 155 μL of a 3% sucrose +0.05% green food dye (McCormick & Co. Inc., Hunt Valley, MD, USA) solution that included a known concentration of formulated imidacloprid (Gaucho® 600FS; 600 g imidacloprid L −1 ; Bayer CropScience, Research Triangle Park, NC, USA) or thiamethoxam (Cruiser® 5FS; 600 g thiamethoxam L −1 ; Syngenta Crop Protection, Greensboro, NC, USA).…”