Ips sexdentatus

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Ips sexdentatus (click on image to enlarge it)
Author(s): Milan Zubrik, Forest Research Institute - Slovakia
Source: IPM Images

Ips sexdentatus Boerner - (six-spined engraver beetle)

The bark beetle infests pine trees, rarely spruce or larch, in Europe and parts of Asia. Stressed and dead trees are preferred, but healthy trees can be also attacked under outbreak conditions. Such outbreaks may, for example, develop when large numbers of wind-felled trees become available for breeding. Symbiotic and pathogenic blue-stain fungi are usually introduced by the beetles into the host trees.

The typical gallery pattern consists of two pairs of up to 1 m long arms in opposite direction from which larval galleries of about 10 cm length branch off. I. sexdentatus is the largest species of the genus Ips and the adults are 5½-8 mm long. Their color is dark brown with long hairs and a row of 6 teeth on the posterior part of each elytrum.

Vernacular names
• Deutsch: Zwölfzähnige Kiefernborkenkäfer
• English: six-spined engraver beetle
• Español: gran barrenillo del pino
• Français: grand rongeur du pin

There may be one generation per year in northern Europe, but up to five in southern Europe. The life cycle from egg to mature adult lasts about 3-4 weeks.