Applied Entomology and Zoology (2001) 36, 269-276

Midori Tuda, Katsuya Shima, Clarence D. Johnson and Katsura Morimoto (2001)
Establishment of Acanthoscelides pallidipennis (Coleoptera: Bruchidae) feeding in seeds of the introduced legume Amorpha fruticosa, with a new record of its Eupelmus parasitoid in Japan
Applied Entomology and Zoology 36 (3), 269-276
Abstract: A North American bruchid beetle Acanthoscelides pallidipennis (Motschulsky) was newly found on Kyushu Island, Japan, the larvae of which feed in seeds of introduced false indigo (or indigobush), Amorpha fruticosa L. (Fabaceae: Astragaleae). The morphological characters of the Japanese population were similar to those of introduced populations in Korea and China and of native populations in Texas. Plant quarantine records indicated that the introduction of A. pallidipennis was due to recent introductions of A. fruticosa seeds from China and/or Korea as soil cover on cut slopes. The proportions of seeds eaten by A. pallidipennis in three consecutive years (1997-1999) in Fukuoka, located in the northern part of Kyushu Island, were as high as 56.0% for the overwintered generation and 92.0% o for the first generation feeding in the dry seeds of previous years. No parasitoid emergence was observed in the first two years. In 1999, however, Eupelmus sp. (Hymenoptera: Eupelmidae) had parasitized the overwintered generation at an extremely low level, which is the first record of a parasitoid of A. pallidipennis in Japan. Time lags required for parasitoids to use introduced phytophagous insects are reviewed. The ability of Eupelmus sp. and its host to overwinter and the short lag between our first observations of each, of the two species in Japan may indicate a joint introduction of the parasitoid with its host.
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Database assignments for author(s): Midori Tuda

Research topic(s) for pests/diseases/weeds:
biocontrol - natural enemies
Research topic(s) for beneficials or antagonists:
surveys/distribution/isolation

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Amorpha fruticosa (weed)		Japan
Acanthoscelides pallidipennis (weed bioagent)			U.S.A. (mid S)
Acanthoscelides pallidipennis (weed bioagent)	Amorpha fruticosa (weed)		Japan