Ephestia kuehniella; FAECES-; Frass volatiles, hymenopteran parasite flight response; HYMENOPTERAN-PARASITES; Habrobracon hebetor; Parasite flight response to host volatiles, experimental study Habrobracon hebetor; CHEMORECEPTION-; LEARNING-; Flight response to lepidopteran host volatiles; Influence of mating & prior experience with host; LEPIDOPTERAN-HOSTS; Ephestia kuehniella; Parasite flight response to host volatiles; CHEMICAL-FACTORS; Lepidopteran host frass volatiles, flight response, experimental study Mated, host experienced Habrobracon hebetor (Say) females were found to fly in a wind tunnel to frass from their host, Ephestia kuehniella Zeller. Distance from the odor source, light intensity, and wind speed were found to influence the flight response. Although differences were found in the flight response of 1- to 13-day-old mated, host experienced females to host frass, they were not significant. Naive virgin females did not respond to host frass in the wind tunnel, while naive mated females did. Experience with hosts, particularly stinging and ovipositing, resulted in a significant increase in the response to host frass of both virgin and mated females, although preexposure to frass or host larval contact were much less effective in eliciting flight behavior. Separation of the active components in host frass resulted in the isolation of two fractions that elicited flight behavior; these fractions were different from fractions containing compounds that were previously identified to elicit a response in a contact bioassay. none