none Animals and man; Control; Biological control; Nutrition; Diet; Life cycle and development; Development; Parasites diseases and disorders; Parasites; Insect parasites; Hosts; Insect hosts; Host parasite relationships; Ecology; Population dynamics Diptera; Hymenoptera; Control of; Insect pests, importance of adult parasite food supply; Food plants; Flowering species, importance in adult survival; Survival; Adult, importance of flowering plants as food supply Mayetiola destructor (Cecidomyiidae); Hymenopteran parasites; Pediobius epigonus, effect of adult food supply; Prevalence, adult food source relationship Pimpla rufata (Ichneumonidae); Longevity; Adult food supply effect Pediobius epigonus (Pteromalidae); Dipteran hosts; Mayetiola destructor; Prevalence; Dipteran host, importance of adult food source