<abstract xmlns="http://www.w3.org/1999/xhtml">The aim of the research was to determine the rate of the damage of xylophagous insects for silver birch (<italic>Betula pendula</italic> Roth.) stands in the Left Bank Forest-steppe of Ukraine. Evaluation of physiological harmfulness considered a health condition of inhabited trees, features of maturating feeding and pathogens vectoring for the cases of so-called ‘provoked aggressiveness’ and its absence. Evaluation of technical harmfulness considered a location and depth of larval galleries and pupal chambers, colonized sapwood surface, and stem part. Evaluation of general harmfulness considered physiological harmfulness, technical harmfulness and generation number.Among 22 xylophagous insect species, 4 species were widespread (<italic>Agrilus viridis</italic> (Linnaeus, 1758), <italic>Xylotrechus rusticus</italic> (Linnaeus, 1758), <italic>Xyleborinus saxeseni</italic> (Ratzeburg, 1837), and <italic>Xyleborinus attenuatus</italic> (Blandford, 1894)); 3 species were common, 6 species were rare and 9 species were single.The highest physiological harmfulness is expected for <italic>Tremex fuscicornis</italic> (Fabricius, 1787) and <italic>Tremex magus</italic> (Fabricius, 1787), <italic>Сhrysobothris affinis</italic> (Fabricius, 1774), <italic>Agrilus viridis</italic> (Linnaeus, 1758), <italic>Xylotrechus rusticus</italic>, and bark beetles. The highest technical harmfulness is expected for wood wasps – <italic>Tremex</italic> spp., jewel beetles <italic>Dicerca furcata</italic> (Thunberg, 1787) and <italic>Dicerca alni</italic> (Fischer von Waldheim, 1824), longhorn beetle <italic>Xylotrechus rusticus</italic>, and xylomycetophages – <italic>Xyleborinus</italic> sp.All widespread species are evaluated by a wide range of physiological harmfulness. Three of them (all except <italic>Agrilus viridis</italic>) are evaluated by highly technical harmfulness and from moderate to highly general harmfulness. Among the species having a common occurrence, <italic>Tremex fuscicornis</italic> can be highly harmful only in the case of tree weakening by negative factors, another two species can be non-harmful, and <italic>Xiphydria longicollis</italic> (Geoffroy, 1785) can be low harmful in the case of tree weakening by negative factors. Among the rare species, <italic>Scolytus ratzeburgi</italic> Janson, 1856 can be low or moderately harmful and <italic>Tremex magus</italic> can be low or highly harmful depending on the presence or absence of other negative factors. Among single species, <italic>Zeuzera pyrina</italic> (Linnaeus, 1761) can be moderately harmful because it colonizes almost healthy trees. The rest three species can be moderately harmful in the case of tree weakening by negative factors.</abstract>

The aim of the research was to determine the rate of the damage of xylophagous insects for silver birch (Betula pendula Roth.) stands in the Left Bank Forest-steppe of Ukraine. Evaluation of physiological harmfulness considered a health condition of inhabited trees, features of maturating feeding and pathogens vectoring for the cases of so-called ‘provoked aggressiveness’ and its absence. Evaluation of technical harmfulness considered a location and depth of larval galleries and pupal chambers, colonized sapwood surface, and stem part. Evaluation of general harmfulness considered physiological harmfulness, technical harmfulness and generation number.Among 22 xylophagous insect species, 4 species were widespread (Agrilus viridis (Linnaeus, 1758), Xylotrechus rusticus (Linnaeus, 1758), Xyleborinus saxeseni (Ratzeburg, 1837), and Xyleborinus attenuatus (Blandford, 1894)); 3 species were common, 6 species were rare and 9 species were single.The highest physiological harmfulness is expected for Tremex fuscicornis (Fabricius, 1787) and Tremex magus (Fabricius, 1787), Сhrysobothris affinis (Fabricius, 1774), Agrilus viridis (Linnaeus, 1758), Xylotrechus rusticus, and bark beetles. The highest technical harmfulness is expected for wood wasps – Tremex spp., jewel beetles Dicerca furcata (Thunberg, 1787) and Dicerca alni (Fischer von Waldheim, 1824), longhorn beetle Xylotrechus rusticus, and xylomycetophages – Xyleborinus sp.All widespread species are evaluated by a wide range of physiological harmfulness. Three of them (all except Agrilus viridis) are evaluated by highly technical harmfulness and from moderate to highly general harmfulness. Among the species having a common occurrence, Tremex fuscicornis can be highly harmful only in the case of tree weakening by negative factors, another two species can be non-harmful, and Xiphydria longicollis (Geoffroy, 1785) can be low harmful in the case of tree weakening by negative factors. Among the rare species, Scolytus ratzeburgi Janson, 1856 can be low or moderately harmful and Tremex magus can be low or highly harmful depending on the presence or absence of other negative factors. Among single species, Zeuzera pyrina (Linnaeus, 1761) can be moderately harmful because it colonizes almost healthy trees. The rest three species can be moderately harmful in the case of tree weakening by negative factors.

Harmfulness of xylophagous insects for silver birch (<italic>Betula pendula</italic> Roth.) in the left-bank forest-steppe of Ukraine

Ukrainian Research Institute of Forestry and Forest Melioration

Folia Forestalia Polonica

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

Harmfulness of xylophagous insects for silver birch ( Roth.) in the left-bank forest-steppe of Ukraine

The aim of the research was to determine the rate of the damage of xylophagous insects for silver birch (Betula pendula Roth.) stands in the Left Bank...

Harmfulness of xylophagous insects for silver birch (Betula pendula Roth.) in the left-bank forest-steppe of Ukraine

Published Online: Oct 07, 2019

Page range: 159 - 173

Received: Apr 27, 2019

Accepted: Jul 19, 2019

DOI: https://doi.org/10.2478/ffp-2019-0016

Keywords
maturation feeding, occurrence, pathogen vectoring, physiological activity, provoked aggressiveness, timber destruction

© 2019 Yuriy Skrylnik et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

Harmfulness of xylophagous insects for silver birch (Betula pendula Roth.) in the left-bank forest-steppe of Ukraine

Published Online: Oct 07, 2019

Page range: 159 - 173

Received: Apr 27, 2019

Accepted: Jul 19, 2019

DOI: https://doi.org/10.2478/ffp-2019-0016

Keywordsmaturation feeding, occurrence, pathogen vectoring, physiological activity, provoked aggressiveness, timber destruction

© 2019 Yuriy Skrylnik et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

Keywords
maturation feeding, occurrence, pathogen vectoring, physiological activity, provoked aggressiveness, timber destruction