Canadian Forest Service Publications

Réglée comme une horloge : l'éclosion des oeufs de l'arpenteuse de la pruche. 2010. Delisle, J. Ressources naturelles Canada, Service canadien des forêts, Centre de foresterie des Laurentides, Quebec, QC. L'éclaircie No. 57. 2 p.

Year: 2010

Issued by: Laurentian Forestry Centre

Catalog ID: 31712

Language: French

Series: Branching Out (LFC - Québec)

Availability: PDF (download)

Mark record


In late summer, the female hemlock looper lays her eggs singly on tree trunks and branches, where they overwinter before hatching the following spring. Researchers with the Canadian Forest Service and Université Laval have been able to explain the synchronized hatching of the eggs of this insect species by studying its embryonic diapause, which consists of three phases: prediapause, diapause and postdiapause. The external factors governing the duration of each of the three phases have been studied in order to develop a model to predict egg hatching, an essential tool for the integrated management of this major pest of balsam fir in eastern Canada.

Also available under the title:
Hemlock looper egg hatching: regular as clockwork. Branching out from the Canadian Forest Service, Laurentian Forestry Centre. No. 57. (English)