Technical Abstract: Although pheromone lures dosed with grandlure are effective in attracting boll weevils to traps, ambient temperatures may influence the rate of pheromone released from lures and subsequently affect the detection efficiency of traps. We examined the rate of grandlure released from three commercial lure dispensers (Hercon, Plato, and Scentry) exposed to temperatures representative of those encountered during the early- and mid-cotton production season in South Texas. Pheromone release was measured daily for two weeks under laboratory conditions (70 degrees F and 85 degrees F), and approximated every two days under field conditions. Laboratory and field evaluations revealed that the influence of ambient temperatures on the amount of pheromone released from lures, particularly during the first week of aging, increased with increasing temperatures. Overall, Scentry lures released the greatest amount of pheromone over the two-week period, but Hercon and Plato lures released more pheromone than Scentry lures during the second week of aging under warmer temperatures. The total amount of pheromone released during the first week of aging was approximately 3 to 4 times greater than the total released during the second week of aging. Given the subtropical climate of South Texas and northeastern Mexico, our findings suggest the initial grandlure dose of lures used in these areas may need to be increased to ensure that a sufficient amount of grandlure is released during the second week of aging or, alternatively, lures may need to be replaced more frequently.