关键词: 橘小实蝇, 遗传性别品系, 不育雄虫, 质量监测, 交配竞争, 扩散能力

Abstract: To utilize sterile insect technique to control the Oriental fruit fly effectively, the genetic sexing strain for the Oriental fruit fly, Bactrocera dorsalis （Hendel） based on pupal color was developed. This strain permits the separation of males from females at the pupal stage. The results indicated that the genetic sexing strain was stable after genetic test cross. The percent egg hatch, pupal weight, adult emergence rate, flight ability, and longevity of the genetic sexing strain under irradiation were not significantly different with the check. Pupae were irradiated with ⁶⁰Co of 100 Gy at 1, 2 and 3 d before emergence (indicated by -1 d, -2 d, and -3 d, respectively),  then mated wild females separately. Percent egg hatch of F1 was extremely low. Flight ability and longevity of the genetic sexing strain under irradiation stress were not significantly different with the check, but the emergence rate of -3 d was significantly different from that of the check, -1 d, and -2 d. Sterile males from the irradiated pupae of -2 d competed with wild males for wild females. The relative sterile index (RSI) was 0.4923, and this means both sterile male and wild male have almost equal competitiveness. Sterile males did not move extensively when there were abundant host plants in the releasing site.

Key words: Bactrocera dorsalis, genetic sexing strain, sterile males, quality control, male sexual competitiveness, dispersal ability