none In western Maryland, the European corn borer, Ostrinia nubilalis (Huebner), exhibited three flight periods (from late May to mid-September 1986-1988) but completed only two generations in corn. Oviposition by corn borer moths increased when the tassels emerged and shed pollen. Peak density of the predators Orius insidiosus (Say) and Coleomegilla maculata (DeGeer) coincided with peak density of the borer's second-generation eggs and neonates. Second-generation egg masses and second and older instars were randomly distributed between plants in the field where first instars were aggregated. Corn borer females of the second flight period deposited most eggs (82%) on the ventral surfaces of leaves in the middle sections of plants near silking ears (76.7%). The emerging neonates initially dispersed randomly on the leaves. Nutrition; Diet; Prey; Life cycle and development; Parasites diseases and disorders; Parasites; Insect parasites; Hosts; Insect hosts; Ecology; Population dynamics; Predators; Habitat; Man made habitat; Land and freshwater zones; Nearctic region; North America; USA Coleomegilla maculata (Coccinellidae ); Orius insidiosus (Anthocoridae ); Insect prey; Ostrinia nubilalis (Lepidoptera); Seasonal abundance of predator & prey; Population density; Predator & lepidopteran prey seasonal abundances; Maryland; Seasonal abundance of predator & lepidopteran prey Lydella thompsoni (Tachinidae ); Macrocentrus grandii (Braconidae ); Lepidopteran hosts; Ostrinia nubilalis; Seasonal prevalence, host larvae density relationship, corn field; Maryland; Seasonal prevalence in lepidopteran host Ostrinia nubilalis (Pyralidae); Food plants; Zea mays (corn); Life stages distribution on plant; Life cycle; Flight periods & seasonal occurrence of life stages; Dipteran parasites; Lydella thompsoni; Hymenopteran parasites; Macrocentrus grandii; Seasonal prevalence, host larvae density relationship; Population density; Predator & parasite seasonal dynamics relationship; Insect predators; Coleomegilla (Coleoptera) & Orius (Hemiptera); Seasonal abundance of predators & prey; Distribution within habitat; Corn field & plants, variation between life stages; Habitat utilization; Life stages distribution in corn field; Cultivated land habitat; Corn field, distribution; Maryland; Distribution in corn field, parasites & predators