Arhopalus rusticus

Appearance

Adults are usually 10-30 mm long. Adults are dark brown or brownish-red and dull. The body is elongated and flattened and slightly haired. Elytrae have 2 or 3 parallel ridges. The antennae of females aren't longer than a half of the body and those of males are about 2/3 of the body length. The egg is white and elongated, and is around 0.5 mm x 1.9 mm in size.. The larva is white, flattened and up to 28-39 mm long. The pupa has a length of up to 25 mm.

Distribution

It is a common species in the northern and central Europe, Siberia, Korea, Mongolia, Japan and northern China. It is also found across the US and has been introduced to Australia. It tends to nest in conifers, such as the Scots pine and the Norway Spruce. It tends to infest the basal part of trees up to 1.5 m in height. It is nocturnal and tends to hide under bark during the day, but is attracted to light after night.

Behavior

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The species adults from mid-June through late-August. The mating occurs at sunset. Females oviposit eggs in clusters into crevices in the thick bark. One female can lay up to 800 eggs. Larvae hatch 2-3 weeks after oviposition and feed under the bark. After 4-6 weeks larvae enter the wood through oval holes and dig tunnels of 6-7 mm in width. Galleries are very similar to those of A. striatum. Larvae overwinter once or twice under the bark or in the wood. In spring or summer of the third year after mating, the larvae construct pupal chambers and chew exit holes . The pupal stage lasts 14-21 days. Adults emerge through exit wholes. The species has one generation every 2 years.

Habitat

It is a common species in the northern and central Europe, Siberia, Korea, Mongolia, Japan and northern China. It is also found across the US and has been introduced to Australia. It tends to nest in conifers, such as the Scots pine and the Norway Spruce. It tends to infest the basal part of trees up to 1.5 m in height. It is nocturnal and tends to hide under bark during the day, but is attracted to light after night.