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Parasitoid assemblages reared from geometrid defoliators (lepidoptera: geometridae) of larch and fir in the alps

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Abstract:

Abstract

1 Geometrid larvae were collected from larch and fir in the Swiss Alps in 1991–94. Eight geometrid species were found in sufficient numbers to rear out parasitoids: Agriopis aurantiaria, Bupalus piniarius, Epirrita autumnata, Eupithecia lariciata, Odontopera bidentata, Lycia isabellae and Semiothisa liturata were collected from larch, and Puengeleria capreolaria was obtained from fir.

2 Parasitoid species belonging to five different guilds and four families were obtained; however, the taxonomic status of some of these is not completely resolved.

3 The parasitoid complex of the larch-feeding species was totally different from that of Tortricidae and Tenthredinidae, which feed on the same host tree. In general, there was little overlap in the parasitoid complexes of the larch geometrids, with the most dominant parasitoid of each species reared from only one host. By contrast, many parasitoid species found during our study are also known to attack the same hosts or closely related hosts on different host tree species in different environments, suggesting that host specificity in geometrid parasitoids is more related to host taxonomy than to host plant or habitat.

Keywords: Geometridae; guild; host range; larch defoliators; parasitoids

Document Type: Research Article

DOI: http://dx.doi.org/10.1111/j.1461-9555.2005.00277.x

Affiliations: 1: Canadian Forest Service, Natural Resources Canada, PO Box 6028, St John's, Newfoundland A1C 5X8, Canada and 2: National Museums of Scotland, Chambers Street, Edinburgh EH1 1JF, U.K.

Publication date: November 1, 2005

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