著者

Yamazaki Kazuo Imai Chobei Natuhara Yoshihiro

出版者

日本応用動物昆虫学会

雑誌

Applied entomology and zoology (ISSN:00036862)

巻号頁・発行日

vol.35, no.2, pp.215-223, 2000-05-25

参考文献数

30

被引用文献数

5 44

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An exotic leaf beetle, Ophraella communa, originating from the Nearctic region, is a multivoltine oligophagous herbivore and was discovered in Japan in 1996. The host-use of the leaf beetle in the field with adult feeding choice and larval performance on some asteraceous plants in the laboratory were surveyed. O. communa showed a hierarchy of food-plant use: The leaf beetle first used Ambrosia artemisiifolia, on which adults preferred to feed and larvae developed well, and its population increased markedly until defoliating this food-plant. Then, the leaf beetle migrated to Am. trifida and Xanthium spp. In the laboratory, Am. trifida was not as preferred by adults as Am. artemisiifolia, although larval performance on Am. trifida was superior. Xanthium was inadequate both in terms of adult feeding choice and larval performance. Neither eggs nor larvae were found on the plant species on which no larvae completed their growth in the laboratory. These findings suggest that the exotic beetle has great mobility and host-discriminating ability. The finding, that Am. trifida was less used than Am. artemisiifolia despite Am. trifida being suitable for larvae, may be attributable to the fact that adutls tend to oviposit on Am. trifida subsequently to feeding.

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.

著者

Yamazaki Kazuo

出版者

日本昆虫学会

雑誌

Entomological science (ISSN:13438786)

巻号頁・発行日

vol.1, no.2, pp.171-178, 1998-06-25

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Community patterns of early spring moths in four secondary forests of Kyoto were studied by molasses trapping with special reference to the vegetation. A total of 1086 individuals belonging to 27 species of Hadeninae, Cuculliinae (Noctuidae), and Thyatiridae were caught in 1993-1995. Orthosia spp., Agrochola evelina, and thyatirids were abundant in woodland with predominant deciduous Quercus trees, while Rhynchaglaea spp. were abundant in woodland dominated by evergreen oaks. The effectiveness of the molasses traps increased with rising air temperature, but declined after April. To survey early spring moths using molasses traps, the season and air temperature should be checked.