Argyriou, L.C. 1981 Establishment of the imported parasite Prospaltella perniciosi (Hym.: Aphelinidae) on Quadraspidiotus perniciosus (Hom.: Diaspididae) in Greece.. Entomophaga 26(2): 125-129.

Notes: Prospaltella perniciosi was imported in Greece to aid in the biological control of Quadraspidiotus perniciosus. Two to 10 years following release in apple trees the parasite was found well established on Q. perniciosus with low parasitism not to exceed 2-5%. Parasitism by indigenous natural enemies, mostly Aphytis spp., was also low. Considering that these trees also suffer damage by other major pests, in order to obtain full benefit from the biological control of Q. periciosus compatible methods of suppressing these pests are required.