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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)...

Abstract

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.

Copyright

Corresponding author

1Corresponding author (e-mail: drew.carleton@unb.ca).

References

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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)...

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