EPTC (S-ethyl dipropylthiocarbamate) was applied to sand traps to evaluate weed control and the prevention of bermudagrass (Cynodon dactylon (L.) Pers.) encroachment. EPTC applied at 6.7 kg/ha in each of two applications at 6 to 7-week intervals, controlled an average of 88% common bermudagrass and 99% large crabgrass [Digitaria sanguinalis (L.) Scop.]. Although EPTC prevented bermudagrass from spreading into sand traps, the treatments did not cause permanent injury when applied directly to several bermudagrass varieties.