o:2875 Transversal stress wave velocity in the tree of Serbian spruce (Picea omorika (Pančić) Purkyně) en In this paper, transversal stress wave velocity was measured in 30 trees of Serbian spruce (Picea omorika /Pančić/ Purk.) using a 2D sonic tomograph. Tomograms were analyzed and speed loss and average speed for Serbian spruce were calculated. Since there is no reference value for this species, in this research the reference value for stress wave velocity of Norway spruce (Picea abies /L./ H. Karst.) was used for comparison. The relative difference between referent and measured stress wave velocity indicates the amount of decay between the two sensors. The largest number of cross-sections had a speed loss of up to 10%, but there were also cross-sections with a speed loss of more than 50% in the transversal direction. This result shows that there are defects and damages in this direction that will reduce the strength of the wood. Summarizing data for trees with speed loss of less than 10%, the average stress wave velocity at the cross-sections is 1635 (1205-2170) m/s. Compared to Norway spruce, this velocity is higher, but not significantly. Serbian spruce, 2D tomography, stress wave velocity, tree health evaluation 1552101 1821-1046 2023-10-02T07:40:05.744Z 44 yes 46 Ivana Živanović 0000-0002-1169-4891 46 Nenad Šurjanac 0000-0002-1141-4001 46 Filip Jovanović 0000-0002-4143-2497 46 Ilija Đorđević 0000-0001-9499-3565 46 Goran Češljar 0000-0003-0438-1050 application/pdf 481209 https://unilib.phaidrabg.rs/o:2875 no yes 1 70 92000001 2022 Zbornik radova Instituta za šumarstvo (ISSN: 0354-1894) do 2007 87 96 Institute for forestry 2022