Asian Longhorned Beetle
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Asian Longhorned Beetle Lifecycle Diagram

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Adult Beetles
Adult Asian longhorned beetles are large (0.75 - 1.50 inches long) with very long black and white banded antennae.  The body is glossy black with irregular white spots.  Adults can be seen from late spring to fall depending on the climate. 

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Adult - Male
Adult - Female

Oviposition Niche
Females chew through the bark down to the cambium/phloem interface with the xylem, and then turn around and inject an egg (one egg per oviposition niche or site) into the tree, creating a visible oviposition scar on the surface of the tree.  Eggs sites are oval or round wounds in the bark (up to 0.5 inch diameter).

The early stages of the larvae feed between the xylem and the phloem, the later stages feed only on the xylem.  Mature larvae reach 2.0 inches in length. 

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The larvae then enter the pupal stage.  The pupae are 1.25 inches long.  The adults later emerge and bore their way out of the tree.

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Emergence Holes
Adult emergence creates 0.5 inch circular emergence holes that can be seen all year round.  The entire process, from egg to adult, lasts 12 to 18 months.

Read more about the biology of ALB at the Research page