Flight time and flight age in the sweet potato weevil, Cylas formicarius (Fabricius) (Coleoptera: Brentidae).
Daily flight patterns and the correlation between adult age and flight in Cylas formicarius were examined in the laboratory at 25 ± 1°C under a LD 14:10 photoregime by a simple method of counting the number of adults flying out of a cup. The flight activity of males peaked just after the onset of darkness and gradually decreased toward the onset of light. Only a small proportion of them flew during the photophase. More than 90% of male adults flew at least once within 2 weeks after exodus from the sweet potato tuber. The proportion of males flying per day increased to a maximum 1 week after the exodus, and about 10% of them flew up to 30 days after the exodus. On the other hand, flight activity of females was low and the proportion of females flying at least once was about 25%. Females flew from 7 to 24 days after the exodus.