Canadian Forest Service Publications

First North American Records for Heterarthrus vagans (Hymenoptera: Tenthredinidae), a Palaearctic Leafmining Sawfly of Alder. 2010. Humble, L.M. The Canadian Entomologist 142(2): 181-187.

Year: 2010

Issued by: Pacific Forestry Centre

Catalog ID: 31920

Language: English

Availability: PDF (request by e-mail)

Available from the Journal's Web site.
DOI: 10.4039/n09-071

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The discovery in southwestern British Columbia of widespread established populations of the Palaearctic leafminer Heterarthrus vagans (Fallén) feeding on native red alder, Alnus rubra Bong. (Betulaceae), is reported. A preliminary survey suggests that it is currently confined to the Fraser Valley west of Hope, its distribution extending north along Howe Sound almost to Squamish. It was not found in the greater Victoria area. No other regions of the province have been surveyed. This introduced sawfly completes at least two generations a year. Diagnostic characters to aid the recognition of adults and feeding larvae of H. vagans and a modified key to adult Heterarthrinae on Betulaceae are provided.