著者

Yamazaki Kazuo Sugiura Shinji

出版者

Entomological Society of Japan

雑誌

Entomological science (ISSN:13438786)

巻号頁・発行日

vol.4, no.2, pp.239-242, 2001

参考文献数

23

被引用文献数

6

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Field observations showed that the gall-parasitic flea weevil Rhynchaenus hustachei often parasitized the pouch galls of the aphid Paracolopha morrisoni on Zelkova serrata leaves in the Kinki District, Central Japan. The eggs of the weevil were laid into the gall walls and hatched larvae entered the galls. Each parasitized gall contained only one weevil. The inside of the gall wall was heavily grazed by the weevil larva, resulting in destruction of the aphid colony. These observations suggest that the weevil is an obligatory cecidophage. At three of six study sites, weevil parasitism was the greatest mortality factor for the aphids. A facultative hyperparasitoid, Eupelmus urozonus (Eupelmidae) and Pteromalus sp. (Pteromalidae) parasitized the larvae and pupae of the weevil.