none Nutrition; Diet; Prey; Parasites diseases and disorders; Parasites; Insect parasites; Hosts; Insect hosts; Ecology; Population dynamics; Predators; Habitat; Man made habitat; Land and freshwater zones; Palaearctic region; Europe Lydella thompsoni (Tachinidae ); Sinophorus turionus (Ichneumonidae ); Trichogramma maidis (Trichogrammatidae ); Lepidopteran hosts; Ostrinia nubilalis; Host mortality rate compared with avian predation; Italy; Pavia; Bastida Pancaracana; Lepidopteran host mortality rate compared with avian predation Ostrinia nubilalis (Pyralidae); Dipteran parasites; Lydella thompsoni; Hymenopteran parasites; Sinophorus turionus & Trichogramma maidis, comparison with avian predation; Mortality; Avian predators & insect parasites, rates compared; Avian predators; Picoides major; Mortality rate, comparison with insect parasitism; Italy; Pavia; Bastida Pancarana; Mortality rate due to avian predator & insect parasites Picoides major (Picidae); Insect prey; Ostrinia nubilalis (Lepidoptera), quantity of prey population consumed; Cultivated land habitat; Maize fields, lepidopteran prey; Italy; Pavia; Bastida Pancarana; Predation on Lepidoptera in maize fields