Stink bugs, Nezara viridula (L.) and Euschistus servus (Say), are becoming more common pests in Louisiana cotton fields. Field and laboratory studies in 2000 compared the susceptibility of these species to selected pyrethroids. The results of the laboratory tests show all pyrethroids (cypermethrin, L-cyhalothrin, and cyfluthrin) except bifenthrin to be significantly more toxic to N. viridula compared to E. servus. In a field study, bifenthrin, at all rates treated, was more toxic to E. servus compared to N. viridula.