Abai, MR

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6th International Congress of DipterologyEvaluation of control measures for Oriental fruit fly,Bactrocera dorsalis Hendel, during an outbreak in thesouthern part of Okinawa Island, JapanMatsuyama, T. (1), H. Kuba (2), T. Kohama (1), D. Haraguchi (3), T. Uesato (3), M.Yamagishi (3), T. Motonaga (4), Y. Shimizu (3), Y. Nakamoto (3) & Y. Sokei (3)(1) Okinawa Prefectural Agricultural Research Center, 820 Makabe, Itoman, Okinawa,901-0336, Japan(2) Research Institute for Subtropic, 1 Asahi-machi, Naha, Okinawa, 900-0029, Japan(3) Okinawa Prefectural Plant Protection Center, 123 Maji, Naha, Okinawa, 902-0072,Japan(4) Sugar Industry and Agricultural Products Division of Okinawa Prefecture, 1-2-2Izumizaki, Naha, Okinawa, 900-8570, JapanAn outbreak of oriental fruit fly, Bactrocera dorsalis Hendel, occurred inthe southern part of Okinawa Island, Japan, in 2002. The male-annihilationtechnique (MAT) and protein bait spray were applied to control theoriental fruit fly. For MAT, fiberboard squares soaked with lure-toxicant, amixture of an attractant (methyl-eugenol) and an insecticide (BRP), weredistributed in infested areas. Protein bait spray that contains insecticidewas also applied on the areas where the oriental fruit fly was detected.Since the male-attractant trap contained the same attractant (methyleugenol)as fiberboard squares, the ability of the traps to catch the fliesshould have declined in these areas. Therefore, to evaluate the controlmeasures, adult flies were captured using an insect net, then the sex ratio ofcaptured flies, mating rate, and sex maturity of captured females wereinvestigated. Furthermore, yellow sticky-trap surveys and fruit-collectingsurveys were conducted to investigate the duration of fly infestation ateach detected point. The proportion of males decreased in the early phaseof control, and the mating rate of females decreased rapidly in thecontrolled areas. These results indicate that MAT effectively controlled theoriental fruit fly. Even though MAT works for only males, the number ofmatured females was decreased with the passing time of control. It isconsidered that matured female flies were controlled with protein baitspray. Yellow sticky-trap surveys and fruit-collecting surveys revealed that160
6th International Congress of Dipterologythe average duration of fly infestation at each detected point was onlyabout nine days. This suggested that the control measures preventedadditional ovipositions by the remaining matured females or nextgeneration flies, and that the combination of MAT and protein bait spraywas an appropriate and effective control measure against the oriental fruitfly.Key Words: Oriental fruit fly, male-annihilation technique, protein baitspray, yellow sticky-trap survey, evaluation∗∗∗∗∗∗∗∗∗∗161
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Abai, MR

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