Movement of Sterile Male Bactrocera cucurbitae (Diptera: Tephritidae) in a Hawaiian Agroecosystem
Journal of Economic Entomology
The melon ßy, Bactrocera cucurbitae Coquillett, invaded the Hawaiian Island chain in 1895. In 1999, a program sponsored by the USDAÐARS to control melon ßy and other tephritid pests in Hawaii over a wide area was initiated on the islands of Hawaii, Maui, and Oahu. To control these ßies in an areawide setting, understanding how ßies move within the landscape is important. To explore the movement of this ßy, we examined the movement of marked, male, sterile, laboratory-reared B. cucurbitae on the
... . cucurbitae on the island of Hawaii in an agricultural setting. Two releases of dyed, sterile ßies consisting of Ϸ15,000 ßies, were released 6 wk apart. Released ßies were trapped back by using Moroccan traps baited with a male attractant. These two releases suggest that in the Hawaiian agricultural areas where the areawide control is being sought, melon ßies do not move extensively when there are abundant larval host and adult roosting sites. Over the course of this study, only one ßy made it the maximum distance that we could detect ßy movement (Ϸ2,000 m in 2 wk). From these data, it seems that the ßies dispersed throughout the study area but then moved very little thereafter. This is very apparent in the second release where the recovery rate after the second week was still fairly high, suggesting that if there are plenty of host Þelds and roosting sites the ßies are unlikely to move.