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:Canadian entomologist 2004-10, Vol.136 (5), p.727-731
Main Authors: Digweed, Scott C., Langor, David W.
Format: Article
Language:English
Subjects:
Alnus
Betula
Biological and medical sciences
Fenusa dohrnii
Fenusa pusilla
Fundamental and applied biological sciences. Psychology
geographical distribution
Heterarthrus nemoratus
host plants
Hymenoptera
insect surveys
leafminers
Phytopathology. Animal pests. Plant and forest protection
Profenusa thomsoni
Protozoa. Invertebrates
Records, symptoms, damages, economic importance, population surveys
sawflies
Tenthredinidae
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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that time, P. thomsoni populations have reached epidemic levels on urban birches in Yellowknife and Hay River, NT (unpublished data).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).
ISSN:0008-347X
1918-3240
DOI:10.4039/n03-096