A field trial with mirex as bait for Reticulitermes spp. was initiated in S Mississippi. Sound wood and attractant (decayed) wood-bait blocks, O.6×2.5×3.8 cm, pressure-impregnated with mirex solution to a retention of 32 mg/block, were placed individually in the soil at 1.5-m spacing. Termite attacks on southern pine reference stakes were suppressed effectively. Since the termites fed more heavily on decayed than on sound wood, pickup of insecticides by the termites was far greater from the attractant blocks. An original installation of the mirex-attractant blocks effectively suppressed termites for 3 years.