The European spruce bark beetle, Ips typographus (Coleoptera: Curculionidae) is one of the most widespread pest forest insect in South Tyrol. The species gained large popularity after the “Vaia” windstorm, which caused a massive damage to the mountain ecosystem of northern Italian forests on October 2018. In South Tyrol the most damaged area was Val d’Ega, but all over Italy ca. 42.000 ha were destroyed tearing down a large number of standing trees, particularly spruce. After Vaia the massive presence of fresh storm-felled trees as well as new marginal trees strongly increased I. typographus populations in several hot spots further expanding the negative effects of this windstorm. Recently, foresters of South Tyrol noticed a difference attraction of the adults of I. typographus to the wood logs, depending on which composition of tree species were present inside the stack. It is well-know that I. typographus is attracted by the spruce plant volatiles, but in these cases a reduced attraction was observed if few logs the Scots pine, Pinus sylvestris, were present in inside the spruce wood stacks. The main goal of this thesis project is to investigate the above observation, quantify the potential reduction of I. typographus in mix wood stacks and to identify which volatile compounds are potentially involved in this interaction. Different field as well laboratory experiments will be carried out on the behavior of I. typographus in selected forests of South Tyrol. Finally, gas-chromatogram experiments as well as electroantennogram recordings with the head space volatiles of spruce as well as of Scots pine logs will be done in order to identify potential semiochemicals. The experiments are planned in collaboration with the Forest Department of South Tyrol.