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Hemlock woolly adelgid – Adelges tsugae (Annand)

Damage - Adelges tsugae (Annand), Hemlock Woolly Adelgid

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.


Regulated Areas

British Columbia

Fort Erie, Ontario (New)

Niagara Falls and Wainfleet, Ontario

Nova Scotia (New)


Policy directive

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