Recently, one of us and his colleagues identified a male-produced aggregation pheromone of Colorado potato beetle, (S)-CPB I, and devised an economically-feasible synthesis for individual enantiomers of the pheromone. In 2004 in Virginia, we applied (S)-CPB I to rubber septa and tested it in the field in pitfall trap and potato trap-crop experiments. Approximately five times as many potato beetles were caught in pitfall traps baited with the pheromone compared to unbaited traps. Also, untreated potato plots with the outer two rows treated with imidacloprid and containing pheromone septa had significantly fewer potato beetles and less defoliation than untreated control plots. The use of (S)-CPB I pheromones that draw beetles to a point source may greatly reduce the amount of insecticides necessary for effective CPB control in potato fields.