First detection of the fruit fly Bactrocera synnephes (Diptera: Tephritidae) on Iriomote Island, south-western Japan
Article first published online: 25 MAR 2008
Volume 11, Issue 1, pages 105–110, March 2008
How to Cite
OHNO, S. and TAMURA, Y. (2008), First detection of the fruit fly Bactrocera synnephes (Diptera: Tephritidae) on Iriomote Island, south-western Japan. Entomological Science, 11: 105–110. doi: 10.1111/j.1479-8298.2007.00251.x
- Issue published online: 25 MAR 2008
- Article first published online: 25 MAR 2008
- Received 8 February 2007; accepted 8 August 2007.
- Bactrocera cucurbitae;
- Bactrocera tau;
- invasive species;
Bactrocera synnephes, a fruit fly species common in Taiwan, was first detected in Japan in 2006, when several male adults were trapped at Kanokawa, an uninhabited coastal area of Iriomote Island, Okinawa (200 km from Taiwan). To examine potential colonization by B. synnephes, we collected fruit of the wild gourd Diplocyclos palmatus (Cucurbitaceae), a host of the fruit fly, as well as other cucurbitaceous species, in Kanokawa and other areas of Iriomote Island. No B. synnephes infestation was found on any cucurbitaceous plants. Based on these results, we conclude that B. synnephes had very recently invaded Iriomote Island, possibly from Taiwan, but had failed to colonize. Bactrocera synnephes may have entered Iriomote Island by natural or human-induced means, but a human-induced invasion pathway is less likely in light of the non-pest status of the species in Taiwan. The disappearance of B. synnephes from Iriomote Island may be related to the loss of host fruit as a result of tropical cyclones. Although B. synnephes is not regarded as a pest elsewhere, the pest status of the species is unclear in Okinawa, where no fruit fly pests currently attack commercial cucurbitaceous fruit. We must remain alert for possible re-invasion by B. synnephes.