Canadian Forest Service Publications

Alien, invasive hemlock woolly adelgid found in Ontario. 2014. Fidgen, J.G.; Turgeon, J.J.; Allison, J.D.; Humble, L.M. Natural Resources Canada. Canadian Forest Service, Great Lakes Forestry Centre, Sault Ste. Marie, Ontario Frontline Technical Note 114, 6 p.

Year: 2014

Issued by: Great Lakes Forestry Centre

Catalog ID: 35865

Language: English

Series: Frontline Technical Note (GLFC - Sault Ste. Marie)

CFS Availability: PDF (download)

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Plain Language Summary

Several eastern hemlock trees infested by the hemlock woolly adelgid (HWA) were recently discovered at two locations in Ontario. These discoveries are important for several reasons: i) HWA is an alien invasive insect; ii) they could signal the early phase of a natural range expansion from populations observed in New York and northern New England; and, iii) HWA can kill eastern hemlock in the understory of riparian habitats in as little as 4 years. Thus, these detections highlight the need to prepare for the eventual establishment of HWA in eastern Canada. This note summarizes what is known about the insect and includes information on its life cycle, signs and symptoms of injury, impact on ecosystems, control options, dispersal and detection. CFS research efforts will likely include risk analysis (to identify potential points-of-entry) and may help determine the long-term costs and benefits of early detection of and intervention against new invasions. Additional research efforts will focus on the development or improvement of early detection tools and delimitation protocols.