In previous studies we observed that close association of boll weevil pheromone traps with prominent vegetation was associated with increased captures of weevils. However, the spatial range over which these effects occur are unknown. We examined the influence of trap distance from brush lines on trap captures in the Lower Rio Grande Valley of Texas. Within a single experimental replication, traps were established 0, 10, and 20 m from the edge of a brush line on both upwind and downwind sides. Thus, a replication involved six traps. Traps within a replication were arranged in a line oriented NE to SW in order to minimize competition among traps given prevailing southeastern winds. The experiment involved a total of 10 replications, established 13 October 2004 and serviced weekly until 2 February 2005. Trapping data were analyzed using mixed-models ANOVA with trap position (upwind, downwind), trap distance (0, 10, 20 m ), and their interaction as fixed effects. Mean weekly captures in traps on upwind sides of brush lines (13.6 weevils) tended to be higher than on downwind sides (11.6 weevils) but those differences were modest. More importantly, mean weekly captures of traps closely associated (0 m ) with brush (18.4 weevils) were about twice those of traps at 10 (9.7 weevils) or 20 m (9.6 weevils) from the brush lines. These results suggest that the effectiveness of boll weevil trapping efforts may be enhanced by associating traps with prominent vegetative features when they are available.