Canadian Forest Service Publications
Is Intense Cold a Threat to the Survival of Hemlock Looper Eggs? 2013. Delisle, J. NRCan, CFS, Laurentian Forestry Centre, Québec, Que. Branching out from the Canadian Forest Service, Laurentian Forestry Centre. No. 86. 2 p.
Available from: Laurentian Forestry Centre
Catalog ID: 35305
Series: Branching Out (LFC - Québec)
Climate change is expected to increase the frequency and intensity of extreme weather events, such as cold spells. Consequently, insects will have to adapt in order to withstand sudden changes in temperature. These insects include the hemlock looper, a major pest attacking balsam fir trees in eastern Canada. Canadian Forest Service and Université Laval researchers have been studying cold tolerance in hemlock looper eggs and the impact of intense cold on insect population dynamics.
Plain Language Summary
This publication reports on the cold tolerance of hemlock looper eggs and its impact on this insect’s population dynamics.
Although hemlock looper eggs have a freezing point of -40°C, cold tolerance tests have demonstrated that 50% of the eggs die after 4 hours of exposure to a temperature of -35°C. The study therefore demonstrated that cold tolerance tests are a more reliable method than determination of the freezing point for estimating the survival probability of hemlock looper eggs.
Branching Out is a series of plain language fact sheets describing Laurentian Forestry Centre research projects.
Also available under the title:
Froid intense : une menace pour la survie des oeufs de l’arpenteuse de la pruche? L’éclaircie du Service canadien des forêts, Centre de foresterie des Laurentides. No 86. (French)
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