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

Published online by Cambridge University Press:  02 April 2012

Scott C. Digweed  and
David W. Langor
Scott C. Digweed
Affiliation:
Natural Resources Canada, Canadian Forest Service, Northern Forestry Centre, 5320 – 122 Street NW, Edmonton, Alberta, Canada T6H 3S5
David W. Langor*
Affiliation:
Natural Resources Canada, Canadian Forest Service, Northern Forestry Centre, 5320 – 122 Street NW, Edmonton, Alberta, Canada T6H 3S5
*
1Corresponding author (e-mail: dlangor@nrcan.gc.ca).
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Extract

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that time, P. thomsoni populations have reached epidemic levels on urban birches in Yellowknife and Hay River, NT (unpublished data).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).

Type
Articles
Information
The Canadian Entomologist , Volume 136 , Issue 5 , October 2004 , pp. 727 - 731
Copyright
Copyright © Entomological Society of Canada 2004

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References

Digweed, S.C., Spence, J.R., Langor, D.W. 1997. Exotic birch-leafmining sawflies (Hymenoptera: Tenthredinidae) in Alberta: distributions, seasonal activities, and the potential for competition. The Canadian Entomologist 129: 319–33Google Scholar
Digweed, S.C., McQueen, R.L., Spence, J.R., Langor, D.W. 2003. Biological control of the ambermarked birch leafminer, Profenusa thomsoni (Hymenoptera: Tenthredinidae), in Alberta. Information Report NOR-X-389. Natural Resources Canada, Canadian Forest Service, Northern Forestry Centre, Edmonton, AlbertaGoogle Scholar
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