Citrus blackfly (CBF),Aleurocanthus woglumiAshby, was discovered in Fort Lauderdale, Fla., in 1976. ParasitesEncarsia opulenta(Silvestri) (Hymenoptera: Aphelinidae) andAmitus hesperidumSilvestri (Hymenoptera: Platygasteridae) were released in infested areas. CBF populations declined and control is now mainly due to the k-selected parasiteE. opulenta. On Merritt Island, however, a third parasite, now known to be a facultative hyperparasite onE. opulenta, was released:Encarsia smithi(Silvestri). Parasite and CBF populations were monitored on Merritt Island from 1981 to 1984. The three parasite species progressed through an initial dominance byA. hesperidum, to intermediate dominance byE. smithi, to final dominance byE. opulenta.