The adult vial test (AVT) was modified to evaluate insecticide susceptibility of two species of stink bugs, brown stink bug, Euschistus servus (Say), and southern green stink bug, Nezara viridula (L.), encountered in Louisiana. Acephate, dicrotophos, bifenthrin, cypermethrin, and lambda-cyhalothrin were tested between species, life stages, and over the duration of the 2001 growing season. There were no differences in responses to an insecticide between early and late-season collections within each species. Brown stink bug adults were most sensitive to acephate, bifenthrin, and cypermethrin as compared to lambda-cyhalothrin. In contrast, southern green stink bug adults were highly sensitive to bifenthrin and lambda- cyhalothrin. The lambda-cyhalothrin LC₅₀ for brown stink bug adults was 51 times higher than that of southern green stink bug adults. Southern green stink bug nymphs were significantly less sensitive to lambda-cyhalothrin than were adults.