Preliminary results of an extensive trapping study consisting of 18 sites in the Mexican state of Tamaulipas and adjacent areas of Nuevo Leon and San Luis Potosi states are reported. Eighteen trapping sites were established to determine spatial and temporal patterns of boll weevil response to pheromone traps in northeastern Mexico. Sites were established in the vicinities of both major cotton production systems of Tamaulipas state, the northern subtropical system and the southern tropical system, as well as at sites distant from cotton production. Trap captures were highest at sites near cotton producing regions, but weevils were captured at all sites. Patterns of trap capture were relatively distinct at sites near cotton, with peaks of capture suggesting dispersal from a maturing crop. Patterns of capture at sites more distant from cotton tended to be less distinct, but peaks often appeared to align with those of sites near cotton. Low but consistent weevil captures at sites far removed from cotton production suggest the potential for a persistent if low level interchange between weevil populations of all cotton producing regions of Tamaulipas.