In Romania, Plutella xylostella L. populations are controlled by an impressive number of primary parasitoids that have a high efficiency reducing the populations of this pest. However, what we have noticed in the last 20 years is the alarming increase of the number of secondary parasitoids as well as their efficiency. In our research from 2003 in eastern Romania (Moldavia), we noticed the presence of 14 primary parasitoids that reduce the number of Plutella xylostetla L. populations by 80-90 %. In return, the primary parasitoids are limited by 14 species of secondary parasitoids reducing their populations with 23.20 %. BR Parasites diseases and disorders. Parasites. Insect parasites. Hosts. Insect hosts. Ecology. Land zones. Palaearctic region. Eurasia. Europe. Hymenoptera (Insecta): Host; Eulophidae (Chalcidoidea): Parasite; Pteromalidae (Chalcidoidea): Parasite; Ichneumonidae (Ichneumonoidea): Parasite; Microgasteridae (Braconidae): Parasite; Plutella xylostella (Plutellidae): Host. Eulophidae, Ichneumonidae: Hymenopteran hosts, Hyperparasitism, pathology, Lepidopteran hosts, Plutella xylostella, Romania, Moldavia; Hymenoptera: Hymenopteran parasites, Eulophidae, Hyperparasitism, in lepidopteran primary host, Ichneumonidae, pathology, Pteromalidae, Romania, Moldavia; Microgasteridae: Lepidopteran hosts, Plutella xylostella, Pathology, Romania, Moldavia; Plutella xylostella: Hymenopteran parasites, Eulophidae, Pathology, Ichneumonidae, Microgasteridae, Population dynamics, Population decline, Romania, Moldavia; Pteromalidae: Hymenopteran hosts, Hyperparasitism, pathology, Romania, Moldavia. ST Animalia, Arthropoda, Insecta, Hymenoptera, Apocrita, Terebrantia, Chalcidoidea; Animalia, Arthropoda, Insecta, Hymenoptera, Apocrita, Terebrantia, Ichneumonoidea, Braconidae; Animalia, Arthropoda, Insecta, Lepidoptera, Glossata, Heteroneura, Yponomeutoidea, Plutellidae. Arthropods; Hymenopterans; Insects; Invertebrates; Lepidopterans. none2006