Abstract
Bactrocera carambolae and B. dorsalis (Diptera: Tephritidae) are extremely destructive pests of fruits and vegetables in the Asia-Pacific region. Earlier reports have described that B. carambolae and B. dorsalis, respectively, use mainly star fruit and mango, suggesting a certain level of host partitioning which can be ascribed neither to differences in larval food qualities nor host-specific parasitoid mortality. This study specifically examined reproductive interference (antagonistic sexual interaction) between B. carambolae and B. dorsalis as a potential factor strongly affecting their host partitioning. We observed mating behaviors, especially interspecific courtships and mating, by cohabiting the conspecific and heterospecific pairs together. Consequently, we quantified their effects on the reproductive success of females. Males of both species frequently courted their own females, but they also courted females of other species. Courtship refusal by females was not selective in males of either species. This incomplete discrimination of both sexes led to frequent occurrences of interspecific sexual interactions in both species, but only B. carambolae females showed reduced reproductive success. These results suggest that B. dorsalis, superior in reproductive interference, can occupy high-quality mango, whereas B. carambolae, inferior in reproductive interference, must use low-quality star fruit.





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Acknowledgements
We thank Mr. Ruswandi and Mr. Suburoto, Director and Former Director of the Pest Forecasting Center (BBPOPT), Ministry of Agriculture Indonesia, for providing laboratory facilities and laboratory-reared insects. We also thank Mr. Firdaus, Mr. Surono and Mr. Imroni of BBPOPT, for preparation and supporting of our study. Autolyzed yeast, a main ingredient of the food for adult fruit flies, was supplied by Asahi Food and Health Care Co., Ltd., Tokyo, Japan. This study was supported by JSPS KAKENHI Grant numbers 22405019 and 25304048.
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Kitano, D., Fujii, N., Sujiono et al. Reproductive interference between two serious pests, oriental fruit flies Bactrocera carambolae and B. dorsalis (Diptera: Tephritidae), with very wide but partially overlapping host ranges. Appl Entomol Zool 53, 525–533 (2018). https://doi.org/10.1007/s13355-018-0584-6
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DOI: https://doi.org/10.1007/s13355-018-0584-6


