Lab-strain tobacco budworm (Heliothis virescens) moths were fed different concentrations of permethrin and spinosyn in 10% sucrose containing 0.2 mg/ml trypan blue dye to obtain dose-mortality, dose-nectar-ingestion, and dose-fecal production responses.  Percent mortality increased with increasing concentration of permethrin.  Ingestion (g of treatment solution per moth) declined with increasing concentration of permethrin.  Trends in percent mortality and ingestion for permethrin were consistent with prior results reported for spinosyn (van Kretschmar et al., 2007).  Blue-dyed fecal production declined with increasing concentration of both insecticides.  These results demonstrate the feasibility of using dyed sucrose solution in an adult-based feeding disruption test to monitor Lepidoptera for development of resistance to chemical insecticides.