Ernobius mollis

(Linnaeus, 1758)

pine knot borer, pine bark anobiid, waney edge borer, bark borer

Ernobius mollis is a small wood-boring in the Ptinidae (formerly Anobiidae), commonly known as the pine knot borer. Native to northern Europe, it has been introduced to North America and is also recorded from the Azores. The develops in dead pine wood, particularly in bark and knots, and is frequently associated with processed timber. Two are recognized: the nominate E. m. mollis and E. m. espanoli from the Iberian region.

Ernobius mollis by (c) Donald Hobern, some rights reserved (CC BY). Used under a CC-BY license.

Ernobius mollis puncture by Siga. Used under a CC BY-SA 3.0 license.

Pronunciation

How to pronounce Ernobius mollis: /ɛrˈnoʊ.bi.əs ˈmɒl.ɪs/

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Identification

Ernobius mollis can be distinguished from other Ernobius by its small size and association with Pinus wood. are typical of the Ptinidae with a compact, somewhat cylindrical body form. The species may be separated from the related Anobium punctatum (common furniture beetle) by preference—E. mollis is primarily found in pine bark and knots rather than seasoned hardwoods. E. m. espanoli differs subtly in geographic distribution, being restricted to the Iberian Peninsula.

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Habitat

Develops in dead wood of pine (Pinus spp.), particularly in bark, knots, and waney edges of processed timber. Has been recorded from standing dead pines as well as felled and stored wood.

Distribution

Native to northern Europe; introduced to North America. Recorded from São Miguel and Terceira in the Azores. The E. m. espanoli occurs in the Iberian Peninsula.

Diet

Larvae feed on dead pine wood (Pinaceae), developing within bark, knots, and sapwood.

Host Associations

Pinus - larval primary ; larvae develop in dead bark, knots, and wood of pine

Life Cycle

Complete with , larval, pupal, and stages. Larvae are wood-borers that tunnel through pine bark and wood, creating galleries packed with . occurs within the wood, with adults emerging through exit holes.

Behavior

are attracted to dead pine material. The is known to infest processed timber, particularly waney-edged boards with bark remnants.

Ecological Role

Decomposer of dead pine wood; contributes to nutrient cycling in pine forests and in timber storage environments.

Human Relevance

Considered a minor pest of processed pine timber, particularly when bark is present on waney edges. The 'waney edge borer' refers to its habit of infesting boards with irregular edges retaining bark. Damage is generally limited compared to more serious timber pests like Anobium punctatum.

Similar Taxa

Anobium punctatumAlso in Ptinidae and similar size, but A. punctatum primarily attacks seasoned hardwoods and softwoods in buildings, whereas E. mollis is restricted to pine bark and knots.
Other Ernobius speciesSeveral Ernobius share pine associations; E. mollis is distinguished by its broad distribution and preference for bark/knot rather than deeper wood.