Distribution of non-native ambrosia bark beetle Xylosandrus germanus (Blandford, 1894) in Slovenia and its impact on forest ecosystems.
Ambrosia bark beetles (Coleoptera: Curculionidae; Scolytinae) are one of the most important non-native invasive organisms. A good example is species Xylosandrus germanus (Blandford, 1894), an East Asian species, which is now widely spread in much of North America and Europe. In Slovenia, X. germanus was first time recorded in 2000. It was found on infested sweet chestnut tree (Castanea sativa Mill.) near Solkan. Since 2008, the species began to appear also in other parts of Slovenia. It was often caught in traps intended for monitoring of Monochamus beetles, and in few cases, infestations of trees were also found. The first major damage was recorded in 2016 when the species attacked larger quantities of freshly harvested timber at Lovrenc na Pohorju. In different parts of Slovenia, monitoring of the species with ethanol-baited traps was conducted in 2017 and 2018. The results of our research show that the species is generally present in different forest stands, and that it has become a dominant ambrosia beetle species in our forests. In the article we will present more detailed results of the monitoring and discuss the impact that this species could have on our forest ecosystems. Mentioned are also some other alien ambrosia beetle species, we found within the same research.