Nosema polyvora (Microspora): Parasite; Pieris brassicae (Pieridae): Host; Apanteles glomeratus (Braconidae): Host, Parasite; Pimpla instigator (Ichneumonidae): Host, Parasite; Pteromalus puparum (Pteromalidae): Host, Parasite. Nosema polyvora: Hymenopteran hosts, Parasitica, Transmission to Lepidoptera, Lepidopteran hosts, Pieris brassicae, Transmission by Hymenoptera, Vector hosts, Parasitica (Hymenoptera), Poland; Pieris brassicae: Hymenopteran parasites, Apanteles, Pimpla and Pteromalus, Host parasite relationships, Protozoan parasites, Nosema polyvora, Transmission by Hymenoptera, Host parasite phylogeny, Pimpla and Pteromalus (Hymenoptera), Prevalence, Reaction of host to parasite, Pimpla and Pteromalus pathogenicity, Poland, host parasite relations and transmission of Protozoa; Apanteles glomeratus, Pimpla instigator, Pteromalus puparum: Protozoan parasites, Nosema polyvora, Transmission to Lepidoptera, Lepidopteran hosts, Pieris brassicae, Host parasite relationships, Host parasite phylogeny, Pieris brassicae (Lepidoptera), Prevalence, Reaction of host to parasite, Pathogenicity in Pieris brassicae (Lepidoptera), Vector of, Nosema polyvora (Protozoa), Poland, Lepidopteran hosts relationships and transmission of Protozoa. ST Protozoa, Microspora; Insecta, Lepidoptera, Glossata, Heteroneura, Papilionoidea, Pieridae; Insecta, Hymenoptera, Apocrita, Terebrantia, Ichneumonoidea, Braconidae; Insecta, Hymenoptera, Apocrita, Terebrantia, Ichneumonoidea, Ichneumonidae; Insecta, Hymenoptera, Apocrita, Terebrantia, Chalcidoidea, Pteromalidae. Arthropods; Hymenopterans; Insects; Invertebrates; Lepidopterans; Protozoans. none