Mediterranean Fruit Fly 1 : Dispersal of Wild and Irradiated and Untreated Laboratory-Reared Males 2

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Abstract
Dispersal studies of wild and of irradiated and unirradiated, laboratory-reared Ceratitis capitata (Wiedemann) males were carried out in a 72.7-ha subtropical fruit orchard near Waimanalo, Hawaii. In five releases, 10.6% of 154,590 male flies which were released in the center of the orchard were recovered in all 54 Steiner traps baited with trimedlure. Of the 21,770 wild males unirradiated and released, the recovery was 8.0%. Of the 132,820 laboratory-reared males irradiated with 0, 5, 10, 15, and 20 krad and released, the recoveries were 12.7, 11.9, 11.0, 10.0, and 9.2%, respectively. Significantly fewer wild flies than laboratory-reared flies were caught for releases 1 to 3, but there were no differences for releases 4 and 5. More laboratory-reared than wild flies were recovered at almost all distances. In general, the laboratory-reared flies treated with lower irradiation levels flew farther than those treated with the higher levels.