In the Lower Rio Grande Valley (LRGV) of Texas, pheromone trap lines were established in the north, within the Valley, and in the south into Northern Mexico to determine the seasonal distribution of boll Weevils, particularly in the non-cotton habitats. The data initiated in 1987 provide an opportunity to evaluate adult weevil movement, population levels, and degree of isolation in the Lower Rio Grande Valley cotton production area of more than 170,000 ha. The data also provide an indication of the potential effect of the boll weevil on the future cotton crop. To date, adult boll weevils are of the LRGV; boo weevils are active continually throughout the entire year with higher peaks of activity occurring in this brushy habitat prior to square production in the spring. In the fall, the peak of activity is similar throughout the LRGV by the highest number of boll weevils detected still occurs in the rushy area.