About Arhopalus rusticus (Linnaeus, 1758)
Adults of Arhopalus rusticus are usually 10–30 mm long. They are dark brown or brownish red, with a dull appearance. Their body is elongated, flattened, and covered in fine, sparse hairs. Each elytron has 2 or 3 parallel ridges. Female antennae are no longer than half the body length, while male antennae reach about two-thirds of the body length. Eggs are white and elongated, measuring approximately 0.5 mm × 1.9 mm. Mature larvae are white and flattened, growing up to 28–39 mm long. Pupae can reach a maximum length of 25 mm. This is a common species found in northern and central Europe, Siberia, Korea, Mongolia, northern Pakistan, Japan, and northern China. It also occurs across the United States, and has been introduced to Australia. Arhopalus rusticus typically develops in conifers, including Scots pine and Norway spruce. It most often infests the basal section of host trees, up to 1.5 m above ground. It is nocturnal: during the day it hides under bark, and after dark it is attracted to light.
