Canadian Forest Service Publications

Too hot to reproduce: How to avoid the worst for the hemlock looper. Delisle, J. 2015. NRCan, CFS, Laurentian Forestry Centre, Québec, Que. Branching out from the Canadian Forest Service, Laurentian Forestry Centre. No. 101. 2 p.

Year: 2015

Issued by: Laurentian Forestry Centre

Catalog ID: 36493

Language: English

Series: Branching Out (LFC - Québec)

Availability: PDF (download)

Mark record


Because of global warming, warmer weather begins earlier in spring and continues later in the fall, thereby extending the season that is favourable to insect development. These seasonal changes will accelerate insect development and reproduction. Canadian Forest Service researchers observed that hemlock looper eggs laid earlier than normal are more likely to die prematurely due to prolonged exposure to warm temperatures. What about the adults? How will they react to warmer weather? Will they be more productive?

Plain Language Summary

This publication describes the effect of temperature on hemlock looper reproduction. Among these effects, rising temperatures decrease the rate of successful mating as well as the percentage of fertile eggs laid by the looper.

Native to North America, the hemlock looper is considered a serious defoliator in Canada. Branching Out is a series of plain language fact sheets describing Laurentian Forestry Centre research projects.

Also available under the title:
Trop chaud pour se reproduire : comment éviter le pire pour l’arpenteuse de la pruche? L’éclaircie du Service canadien des forêts, Centre de foresterie des Laurentides. No 101. (French)