Laricobius nigrinus (predator)

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Laricobius nigrinus (click on image to enlarge it)
Author(s): Ashley Lamb, Virginia Polytechnic Institute and State University
Source: IPM Images

Laricobius nigrinus (predator) Fender

The beetle is a specialist predator of the hemlock woolly adelgid, Adelges tsugae and is native to north-western North America. It has been released in eastern North America since 2003. After it was released, it was found that it is able to hybridize with Laricobius rubidus, a species which is native to eastern North America. In the south-eastern U.S. the percentage of hybrids in a population was determined to be around 10% (Wiggins et al., 2016).

The beetles lay eggs in the spring and the larvae feed on adelgid eggs. The mature larvae then drop to the ground for pupation. The adults undergo a diapause period in the summer and emerge from the soil in autumn. They feed until spring on adelgid nymphs. The adults are about 3 mm large and the development time from egg to adult, through 4 larval instars, is about 6 weeks.

For details see the respective page in BugwoodWiki.