Types of bark beetle (Coleoptera: Scolytidae) infestation in spruce forest stands affected by air pollution, bark beetle outbreak and honey fungus (Armillaria mellea) |
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Authors: | R Jaku? |
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Institution: | (1) Ph.D. Institute of Forest Ecology, Slovak Academy of Sciences, Štúrova 2, 960 53 Zvolen, Slovakia |
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Abstract: | 583 spruce stands in an area affected by air pollution and bark beetle outbreak in Eastern Slovakia were studied in 1996.
According to bark beetle infestation of dominant and codominant trees, stands were classified into following types of spruce
stand decline:Ips typographus-A,Ips typographus-B,Polygraphus poligraphus, I. typographus/P. poligraphus—A,I. typographus/P. poligraphus—B. The presence of attacked trees in forest edges, bark beetle spots and forest interior was the key important factor for
the classification.
Data from forest inventory and forest management evidence together with data on types of spruce stands decline were used in
further analyses. Results shows that the distribution of forest stands classified into different types or uninfested stands
is related mainly to host size and site quality. The percentage of spruce, exposition of stands and stand density showed significant
effects. The mechanisms of spreading of studied bark beetle outbreak could be explained by direct effects of stress of trees
caused by an abrupt increase of level of solar irradiation and by weakening of trees by the honey fungus. |
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