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The oriental fruit fly and its relatives, Bactrocera dorsalis complex Hendel (Diptera: Tephritidae) were eradicated from the islands of Okinawa Prefecture, southwestern Japan, in 1986. Since just after the eradication, however, re-invasion of B. dorsalis complex has been continuing to date, and the cause of the re-invasion has not been fully analyzed yet. It is believed that there are two possible...