Distributions of leafmining sawflies (Hymenoptera: Tenthredinidae) on birch and alder in northwestern Canada

Exotic leafmining sawflies (Hymenoptera: Tenthredinidae) on birch ( Betula spp., Betulaceae) have become widely distributed in Canada since their introduction to eastern North America in the last century (Digweed et al. 1997). However, their distributions north of the 60th parallel are poorly known...

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Bibliographic Details
Published in:The Canadian Entomologist
Main Authors: Digweed, Scott C., Langor, David W.
Format: Article in Journal/Newspaper
Language:English
Published: Cambridge University Press (CUP) 2004
Subjects:
Insect Science
Molecular Biology
Physiology
Ecology, Evolution, Behavior and Systematics
Structural Biology
Northwest Territories
Yellowknife
Canada
Hay River
Louise Falls
Online Access:http://dx.doi.org/10.4039/n03-096
https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0008347X00001784
Description
Summary:Exotic leafmining sawflies (Hymenoptera: Tenthredinidae) on birch ( Betula spp., Betulaceae) have become widely distributed in Canada since their introduction to eastern North America in the last century (Digweed et al. 1997). However, their distributions north of the 60th parallel are poorly known (Digweed et al. 2003). No birch leafmining sawflies were detected at Hay River and Louise Falls, Northwest Territories (NT), in 1993, but the ambermarked birch leafminer, Profenusa thomsoni (Konow), was reported from Yellowknife, NT, in 1994 (Digweed et al. 1997). Since that time, P. thomsoni populations have reached epidemic levels on urban birches in Yellowknife and Hay River, NT (unpublished data). While examining infested birches in Hay River in 2003, the authors also found the European alder leafminer, Fenusa dohrnii (Tischbein), attacking alder ( Alnus spp., Betulaceae).

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