Skip to main content Accessibility help

Seasonal parasitism of hemlock looper (Lepidoptera: Geometridae) eggs in eastern Canada

  • Drew Carleton (a1), Lucie Royer (a2), Christian Hébert (a3), Johanne Delisle (a3), Richard Berthiaume (a4), Eric Bauce (a4) and Dan Quiring (a1)...


A 2-year field study was conducted using sentinel traps to determine the seasonal distribution of the egg parasitoid (Hymenoptera) complex attacking hemlock looper, Lambdina fiscellaria (Guenée), throughout eastern Quebec and western Newfoundland. Hemlock looper populations remained low in all areas over the course of the study. Parasitism of eggs in sentinel traps was generally lower in fall than in spring. Trichogramma Westwood (Trichogrammatidae) as well as Telenomus flavotibiae Pelletier and an unidentified species of Telenomus Haliday (Scelionidae) only parasitized eggs in the fall. Telenomus droozi Muesebeck only parasitized eggs in the spring, whereas T. coloradensis Crawford attacked eggs during both fall and spring. Telenomus coloradensis was the most abundant parasitoid species collected and was far more abundant in spring than in fall collections.

Une étude de terrain d’une durée de deux ans a été entreprise pour déterminer la répartition saisonnière de l’attaque des oeufs de l’arpenteuse de la pruche, Lambdina fiscellaria (Guenée), par son complexe de parasitoïdes (Hyménoptère). Des pièges sentinelles ont été placés à l’automne et au printemps dans des sapinières situées dans l’est du Québec et sur la côte ouest de Terre-Neuve. Les densités de populations de l’arpenteuse ont été faibles pendant toute la durée de cette étude dans tous les sites échantillonnés. Le parasitisme des oeufs des pièges sentinelles a été généralement plus faible en automne qu’au printemps. Trichogramma Westwood (Trichogrammatidae), Telenomus flavotibiae Pelletier et une espèce non-identifiée de Telenomus Haliday (Scelionidae) ont parasité les oeufs de l’arpenteuse seulement à l’automne. Telenomus droozi Muesebeck n’a parasité les oeufs qu’au printemps, alors que T. coloradensis Crawford les a attaqué au cours des deux saisons. Telenomus coloradensis a été l’espèce de parasitoïde la plus abondante dans nos échantillons tant en automne qu’au printemps et ce dans les deux provinces.


Corresponding author

1Corresponding author (e-mail:


Hide All
Carroll, W.J. 1956. History of the hemlock looper, Lambdina fiscellaria fiscellaria (Guen.), (Lepidoptera: Geometridae) in Newfoundland, and notes on its biology. The Canadian Entomologist, 88: 587599.
Delisle, J., West, R.J., and Bowers, W.W. 1998. The relative performance of pheromone and light traps in monitoring the seasonal activity of both sexes of the eastern hemlock looper, Lambdina fiscellaria fiscellaria. Entomologia Experimentalis et Applicata, 89(1): 8798 doi:10.1046/j.1570-7458.1998.00385.x.
Hartling, L., MacNutt, P.M., and Carter, N. 1991. Hemlock looper in New Brunswick: notes on biology and survey methods. Report of the Timber Management Branch, Forest Pest Management Sector, New Brunswick Department of Natural Resources and Energy, Fredericton, New Brunswick.
Hartling, L.K., Carter, N., and Proude, J. 1999. Spring parasitism of overwintered eggs of Lambdina fiscellaria fiscellaria (Lepidoptera: Geometridae) by Telenomus near alsophilae (Hymenoptera: Scelionidae). The Canadian Entomologist, 131: 421422.
Hébert, C., Berthiaume, R., Dupont, A., and Auger, M. 2001. Population collapses in forecasted outbreak of Lambdina fiscellaria (Lepidoptera: Geometridae) caused by spring egg parasitism by Telenomus spp. (Hymenoptera: Scelionidae). Environmental Entomology, 30: 3743.
Hébert, C., Jobin, L., Auger, M., and Dupont, A. 2003. Oviposition traps to survey eggs of Lambdina fiscellaria (Lepidoptera: Geometridae). Journal of Economic Entomology, 96(3): 768776 PMID:12852615.
Hébert, C., Berthiaume, R., and Bordeleau, C. 2006. Polyurethane foam strips to estimate parasitism of hemlock looper (Lepidoptera: Geometridae) eggs by Telenomus spp. (Hymenoptera: Scelionidae). The Canadian Entomologist, 138(1): 114117 doi:10.4039/N05-031.
Orr, D.B. 1988. Scelionid wasps as biological control agents: a review. Florida Entomologist, 71(4): 506528 doi:10.2307/3495011.
Otvos, I.S. 1973. Biological control agents and their role in the population fluctuation of the eastern hemlock looper in Newfoundland. Information Report N-X-102, Newfoundland Forest Research Centre, Canadian Forest Service, Natural Resources Canada, St. John's, Newfoundland.
Otvos, I.S., and Bryant, D.G. 1972. An extraction method for rapid sampling of eastern hemlock looper eggs, Lambdina fiscellaria fiscellaria (Lepidoptera: Geometridae). The Canadian Entomologist, 104: 15111514.
Pelletier, G., and Piché, C. 2003. Species of Telenomus (Hymenoptera: Scelionidae) associated with the hemlock looper (Lepidoptera: Geometridae) in Canada. The Canadian Entomologist, 135(1): 2329 doi:10.4039/N02-035.
Torgersen, T.R., and Ryan, R.B. 1981. Field biology of Telenomus californicus Ashmead, an important egg parasite of Douglas-fir tussock moth. Annals of the Entomological Society of America, 74: 185186.
Zar, J.H. 1999. Biostatistical analysis. 4th ed. Prentice Hall, Upper Saddle River, New Jersey.

Seasonal parasitism of hemlock looper (Lepidoptera: Geometridae) eggs in eastern Canada

  • Drew Carleton (a1), Lucie Royer (a2), Christian Hébert (a3), Johanne Delisle (a3), Richard Berthiaume (a4), Eric Bauce (a4) and Dan Quiring (a1)...


Full text views

Total number of HTML views: 0
Total number of PDF views: 0 *
Loading metrics...

Abstract views

Total abstract views: 0 *
Loading metrics...

* Views captured on Cambridge Core between <date>. This data will be updated every 24 hours.

Usage data cannot currently be displayed