engleski

RECENT BARK BEETLE RELATED PROBLEMS IN CROATIA WITHIN THE WIDER EUROPEAN SCALE

Bark beetle damages in the forests increased during the last few years in Croatia. On a national level this is considered as a new trend in forest health status. At the same time this has been present in a larger European scale for more than 10 years minimum. Most of the dominant damaging bark beetle species listed in Europe, like Ips typographus, Pityokteines chalcographus, Ips acuminatus, Tomicus piniperda, Ips sexdentatus, Tomicus minor, Trypodendron lineatum, Ips amitinus and Pityokteines curvidens (Gregoire&Evans 2004), cause timber losses also in Croatia. However, some of them, like Ips duplicatus or Dendroctonus micans so far haven't been recorded in Croatian forests, while others, like Pityokteines spinidens or Tomicus spp. seem to be much more damaging than in the rest of the Europe. It is well known and thoroughly documented that Ips typographus and Pityokteines chalcographus are the most important European bark beetles attacking more than 3 million ha of spruce forests in the last ten years and causing death of trees and timber loss of 40 million m3. These two bark beetles are present in Croatia but the area of forests with spruce being a dominant species is negligible compared to forest types throughout the rest of Europe. Definitively, this is reflected in the relative insignificance of spruce timber in the gross national timber production. Silver fir, on the other hand, is the most important conifer species in Croatian forests where the increasing fir bark beetle outbreaks in the north caused timber losses from a few thousand m3 in 2002, 60.000 m3 both in 2003 and 2004 and up to 170.000 m3 in 2005. As another differing example, it can be said that there has been no consistent evidence of bark beetle outbreaks in the genus Tomicus in European scale, while these seem to appear in recent years in the central part of Croatia where T. piniperda and T. minor attacks clearly caused death of pine trees, much in a pattern known for the most dangerous and aggressive spruce bark beetles like I. typographus.

Ips typographus; Pityokteines chalcographus; Ips acuminatus; Tomicus piniperda; Ips sexdentatus; Tomicus minor; Trypodendron lineatum; Ips amitinus; Pityokteines curvidens

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