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EXOTIC BIRCH-LEAFMINING SAWFLIES (HYMENOPTERA: TENTHREDINIDAE) IN ALBERTA: DISTRIBUTIONS, SEASONAL ACTIVITIES, AND THE POTENTIAL FOR COMPETITION

Published online by Cambridge University Press:  31 May 2012

Scott C. Digweed ,
John R. Spence  and
David W. Langor
Scott C. Digweed
Affiliation:
Department of Biological Sciences, University of Alberta, Edmonton, Alberta, Canada T6G 2E9
John R. Spence*
Affiliation:
Department of Biological Sciences, University of Alberta, Edmonton, Alberta, Canada T6G 2E9
David W. Langor
Affiliation:
Canadian Forest Service, Northwest Region, Northern Forestry Centre, 5320 - 122 Street, Edmonton, Alberta, Canada T6H 3S5
*
1Author to whom reprint requests should be sent.
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Abstract

The exotic birch-leafmining sawflies Fenusa pusilla (Lepeletier), Profenusa thomsoni (Konow), and Heterarthrus nemoratus (Fallen) occurred in Alberta during 1992–1995, but only the first two were abundant. Birch-leafmining sawflies occurred at all sites surveyed in central and southern Alberta, and appeared to be expanding their ranges northward. Adult F. pusilla began emerging in mid-May (approximately 220 DD05), and there were one to three generations per year, depending on location and year. Female F. pusilla were relatively less abundant on young than on mature trees. Profenusa thomsoni began attacking trees in June (between 400 and 550 DD05), and was invariably univoltine. Both species were more abundant and were active earlier on urban trees than at a nearby rural location. The highest catches and most complete representations of seasonal activity were obtained using yellow sticky traps. Larval F. pusilla and P. thomsoni are unlikely to compete directly for leaf resources because their leafmining activities are separated spatially and temporally, but they probably compete intraspecifically.

Résumé

Des mineuses du bouleau exotiques, Fenusa pusilla (Lepeletier), Profenusa thomsoni (Konow) et Heterarthrus nemoratus (Fallen), ont été trouvées en Alberta entre 1992 et 1995, mais seules les deux premières espèces étaient abondantes. Des mineuses ont été trouvées à tous les sites inventoriés dans le centre et le sud de l’Alberta et semblaient se répandre vers le nord. Les adultes de F. pusilla ont commencé à émerger à la mi-mai (à environ 220 DJ05) et l’espèce produisait de une à trois générations par année, selon l’endroit et l’année. Les femelles de F. pusilla étaient relativement moins abondantes sur les jeunes arbres que sur les arbres à maturité. La mineuse P. thomsoni s’est répandue dans les arbres en juin (entre 400 et 550 DJ05), et l’espèce a toujours été univoltine. Les deux espèces étaient plus abondantes et elles étaient plus actives plus tôt dans les arbres des villes que dans les zones rurales avoisinantes. Ce sont les pièges collants jaunes qui ont donné les échantillons les plus abondants et les représentations les plus complètes de l’activité saisonnière. Les larves de F. pusilla et de P. thomsoni ont peu de chance de se faire une compétition directe pour les ressources foliaires, car leurs activités alimentaires sont séparées dans l’espace et dans les temps, mais il y a sans doute compétition intraspécifique chez ces espèces.

[Traduit par la Rédaction]

Type
Articles
Information
The Canadian Entomologist , Volume 129 , Issue 2 , April 1997 , pp. 319 - 333
Copyright
Copyright © Entomological Society of Canada 1997

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