Hourly sampling catches of Manduca sexta (L.) in electrocutor grid traps baited with a blacklight lamp, virgin females, or both attractants, indicated that these moths are active all night in the Gainesville, Florida, area. Traps baited with females captured only males; traps baited with blacklight and blacklight + females caught both sexes. Many more males than females were captured at all hours of the night. Peak catches of males occurred between 2 and 4 AM EDT in each of the 3 treatments. Most females were captured between sunset and midnight.
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Mitchell et al. (1972) studied this question.