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Tree recovery during the aftermath of an outbreak episode of the Hungarian spruce scale in southern Sweden

Winde, Inis LU ; Anderbrant, Olle LU and Jönsson, Anna Maria LU (2018) In Scandinavian Journal of Forest Research
Abstract

In 2010, the first, and so far only, infestation of the Hungarian spruce scale (Physokermes inopinatus) and accompanying sooty mould occurred in Scania, southernmost Sweden. About 1000 ha of Norway spruce (Picea abies) were affected, and the trees suffered from the sucking of the insects as well as from the dense sooty mould that covered the needles. Salvage cuttings were carried out in many of the massively attacked forest stands, both in response to the fear that the trees otherwise would die, e.g. from secondary bark beetle attacks and to prevent spreading of the infestation. The aim of this study was to provide basic, quantitative knowledge on the aftermath response of trees that were heavily infested, but not exposed to salvage... (More)

In 2010, the first, and so far only, infestation of the Hungarian spruce scale (Physokermes inopinatus) and accompanying sooty mould occurred in Scania, southernmost Sweden. About 1000 ha of Norway spruce (Picea abies) were affected, and the trees suffered from the sucking of the insects as well as from the dense sooty mould that covered the needles. Salvage cuttings were carried out in many of the massively attacked forest stands, both in response to the fear that the trees otherwise would die, e.g. from secondary bark beetle attacks and to prevent spreading of the infestation. The aim of this study was to provide basic, quantitative knowledge on the aftermath response of trees that were heavily infested, but not exposed to salvage cutting. Growth characteristics, in terms of needle weight, shoot length and tree-ring size were measured on infested and uninfested trees to compare and contrast the spruce growth before, during and after the scale outbreak. The infestation resulted in dwarf annual shoots, stunted needles and thin tree rings. The needle weight returned to normal the following year, whereas shoot length and tree rings required one growing season before full recovery.

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author
organization
publishing date
type
Contribution to journal
publication status
epub
subject
keywords
needle weight, Physokermes inopinatus, Picea abies, shoot length, tree ring
in
Scandinavian Journal of Forest Research
pages
7 pages
publisher
Taylor & Francis
external identifiers
  • scopus:85041013608
ISSN
0282-7581
DOI
10.1080/02827581.2018.1424932
language
English
LU publication?
yes
id
fff82b12-4a2a-482f-bf70-81efe30fc80f
date added to LUP
2018-02-06 06:55:49
date last changed
2018-02-06 06:55:49
@article{fff82b12-4a2a-482f-bf70-81efe30fc80f,
  abstract     = {<p>In 2010, the first, and so far only, infestation of the Hungarian spruce scale (Physokermes inopinatus) and accompanying sooty mould occurred in Scania, southernmost Sweden. About 1000 ha of Norway spruce (Picea abies) were affected, and the trees suffered from the sucking of the insects as well as from the dense sooty mould that covered the needles. Salvage cuttings were carried out in many of the massively attacked forest stands, both in response to the fear that the trees otherwise would die, e.g. from secondary bark beetle attacks and to prevent spreading of the infestation. The aim of this study was to provide basic, quantitative knowledge on the aftermath response of trees that were heavily infested, but not exposed to salvage cutting. Growth characteristics, in terms of needle weight, shoot length and tree-ring size were measured on infested and uninfested trees to compare and contrast the spruce growth before, during and after the scale outbreak. The infestation resulted in dwarf annual shoots, stunted needles and thin tree rings. The needle weight returned to normal the following year, whereas shoot length and tree rings required one growing season before full recovery.</p>},
  author       = {Winde, Inis and Anderbrant, Olle and Jönsson, Anna Maria},
  issn         = {0282-7581},
  keyword      = {needle weight,Physokermes inopinatus,Picea abies,shoot length,tree ring},
  language     = {eng},
  month        = {01},
  pages        = {7},
  publisher    = {Taylor & Francis},
  series       = {Scandinavian Journal of Forest Research},
  title        = {Tree recovery during the aftermath of an outbreak episode of the Hungarian spruce scale in southern Sweden},
  url          = {http://dx.doi.org/10.1080/02827581.2018.1424932},
  year         = {2018},
}