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Insects and other arthropods

Asian longhorned beetles

Anoplophora glabripennis

Tabs group


An Asian longhorned beetle is from 20 to 35 mm long. It has long black antenna, with white bands. Its black elytra are marked with about twenty irregular white spots. The scutellum is black, and its legs are black and greyish-blue.

Life cycle

Adults are visible from May to November. After mating, females lay from 25 to 32 eggs in the upper part of the trunk or on the main branches of the host tree.

The larvae emerge about 11 days later. They develop beneath the bark, where they moult three times. In the fourth instar, they tunnel more deeply into the wood. At maturity, the larva turns into a whitish pupa about 30 to 33 mm long. The pupa eventually metamorphoses into an adult, which emerges from the tree through a hole 6 to 12 mm across.

Where are they from?

These insects were introduced into North America and were observed for the first time in the wild in Brooklyn, New York State, in 1996. In Canada, they were seen in the wild for the first time in 2003, on the outskirts of Toronto.

Geographic distribution

These beetles occur naturally in China, Korea and possibly Japan. The species was introduced accidentally to North America. It has not yet been reported in Quebec.

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