iForest - Biogeosciences and Forestry


Determination of differences in temperature regimes on healthy and bark-beetle colonised spruce trees using a handheld thermal camera

Andrej Majdák (1)   , Rastislav Jakuš (1-2), Miroslav Blaženec (1)

iForest - Biogeosciences and Forestry, Volume 14, Issue 3, Pages 203-211 (2021)
doi: https://doi.org/10.3832/ifor3531-014
Published: May 02, 2021 - Copyright © 2021 SISEF

Research Articles

In this study, we compared the daily temperature regimes of healthy uninfected trees in the interior of a forest stand and at the fresh forest edge with infested trees at the forest edge in an area affected by a bark beetle outbreak. We estimated the potential of a handheld thermal camera for early identification of bark-beetle infested trees. We show that infested trees have significantly higher trunk temperatures than uninfested trees, which is more visible on the shine side of the trunk, and we report the differences in temperature between the shine and shadow sides. The differences are more noticeable on a warm, bright, and sunny day than on cold and cloudy day. The different intensity of solar radiation does not affect the distinction between infested and uninfested trees. The handheld thermal camera shows potential for identifying bark-beetle infested trees by scanning tree trunks on bright sunny days.


Bark-beetle Infested Trees, Handheld Thermal Camera, Incoming Solar Radiation, Norway Spruce, Solar Radiation Modelling, Temperature Differences

Authors’ address

Andrej Majdák 0000-0002-7688-8152
Rastislav Jakuš 0000-0003-2280-1952
Miroslav Blaženec 0000-0001-9743-614X
Institute of Forest Ecology, Slovak Academy of Sciences, Ludovíta Štúra 2, 960 53 Zvolen (Slovak Republic)
Rastislav Jakuš 0000-0003-2280-1952
Faculty of Forestry and Wood Sciences, Czech University of Life Sciences, Kamýcká 1176, 165 21 Praha 6 - Suchdol (Czech Republic)

Corresponding author

Andrej Majdák


Majdák A, Jakuš R, Blaženec M (2021). Determination of differences in temperature regimes on healthy and bark-beetle colonised spruce trees using a handheld thermal camera. iForest 14: 203-211. - doi: 10.3832/ifor3531-014

Academic Editor

Carlotta Ferrara

Paper history

Received: May 21, 2020
Accepted: Feb 23, 2021

First online: May 02, 2021
Publication Date: Jun 30, 2021
Publication Time: 2.27 months

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