A method for achieving increased effectiveness when using a synthetic pheromone composition to cause mating disruption among insect pests such as the navel orangeworm. Makes use of automated dispensers such as aerosol dispensers strategically placed throughout and area of treatment such as an orchard or field and configured to initiate the timed release of an attractant composition such as a synthetic pheromone. In at least one case the attractant composition is a synthetic pheromone comprising (Z,Z)-11, 13-hexadecadienal, and at least one of the following (Z,Z,Z,Z,Z)-3, 6, 9, 12, 15-tricosapentaene, (Z,Z,Z,Z,Z)-3, 6, 9, 12, 15-pentacosapentaene, (Z,Z)-11, 13-hexadecadien-1-ol. The attractant composition is mixed and loaded into the dispensers for distribution in aerosol form. Once the dispensers are loaded to hang in the air during periods of heightened insect pest activity so that mating behavior of the targeted pest population is effectively disrupted. Mixed with stabilizing carrier for prolonged use during growing season.