none Techniques; Mathematical techniques; Parasites diseases and disorders; Ecology Comprehensive Zoology; Mathematical model; Host parasite interaction simulation, density role Agrotis segetum (Noctuidae); Mathematical model; Hymenopteran parasite interactions; Host parasite relationships; Apanteles telengai (Hymenoptera), primary density dynamics; Population dynamics; Hymenopteran parasite primary density role, model Apanteles telengai (Braconidae); Mathematical model; Lepidopteran host interactions; Host parasite relationships; Agrotis segetum (Lepidoptera), primary density dynamics; Population dynamics; Lepidopteran host primary density role, model