Hemlock woolly adelgid – Adelges tsugae (Annand)

Hemlock woolly adelgid is an aphid-like insect that attacks and kills hemlock trees. Its egg sacs, which look like cotton balls or clumps of snow, can be found at the base of needles. It can be spread by wind, animals and human movement of nursery stock, logs, firewood and other wood products. Hemlock woolly adelgid was first reported in Canada in British Columbia in the 1920s, and in the United States in the 1950s.

Detections

• Niagara Falls, Ontario: 2013, 2015, 2019
• Southwestern Nova Scotia: 2017
• Wainfleet, Ontario: 2019
• Fort Erie, Ontario: 2021
• Pelham, Ontario: 2022
• Grafton, Ontario: 2022
• Hamilton, Ontario: 2023
• Halifax County, Nova Scotia: 2023
• Haldimand County, Ontario: 2023
• Hants County, Nova Scotia: 2023

Regulated Areas

British Columbia

• Amended Hemlock woolly adelgid infested places order

Fort Erie, Ontario (New)

• Amended Hemlock woolly adelgid infested places order
• New movement restrictions in place to prevent the spread of hemlock woolly adelgid

Niagara Falls and Wainfleet, Ontario

• Amended Hemlock woolly adelgid infested places order
• New movement restrictions in place to prevent the spread of hemlock woolly adelgid

Nova Scotia (New)

• Amended Hemlock woolly adelgid infested places order
• New movement restrictions in place to prevent the spread of hemlock woolly adelgid

Resources

• Pest fact sheet
• Questions and answers
• North American Plant Protection Organization (NAPPO) pest alert
• Hemlock woolly adelgid management plan for Canada
• Poster: hemlock woolly adelgid
• Don't move firewood campaign

Policy directive

• D-07-05: Phytosanitary requirements to prevent the introduction and spread of the hemlock woolly adelgid (Adelges tsugae Annand) from the United States and within Canada