The Australian weevil Oxyops vitiosa was introduced in south Florida in 1997 for the biological control of the invasive weed Melaleuca quinquenervia (Myrtaceae). This weevil species has since been in great demand throughout the infested area of Florida. Efforts to redistribute this weevil and attempts to estimate field densities have prompted the development of aggregation pheromone sampling tools. The results suggest that like other weevil species, plant volatiles act together with insect-produced compounds to attract both sexes of the weevil. Moreover, the insects appear to modify plant compounds which function as important components for weevil aggregation.