Abstract
This study dealt with the species distribution and frequency of ophiostomatoid fungi associated with the bark beetle Ips typographus on Norway spruce and Scots pine in north-eastern Poland. At all locations high spruce bark beetle damage has occurred in 2002-2003. Fungi were isolated from beetles and from brood systems of trees infested by the spruce bark beetle. The ophiostomatoid fungi were represented by 13 species. A similar spectrum of ophiostomatoid fungi as that recorded from <em>Picea abies</em> was associated with <em>I. typographus</em> on <em>Pinus sylvestris</em> trees. The most frequent ophiostomatoid species isolated from beetles, phloem and sapwood of Norway spruce were <em>O. bicolor</em> and <em>O. penicillatum</em>. The frequency of occurrence of ophiostomatoid fungi varied significantly among the examined locations. <em>O. bicolor</em> was the most frequently found species on Scots pine infested by <em>I. typographus</em>. The potential role of ophiostomatoid fungi in the epidemiology of <em>I. typographus</em> is discussed. Additionally, we also recorded how the ophiostomatoid fungi associated with spruce bark beetle could grow into phloem and sapwood of <em>Pinus sylvestris</em> trees.
Highlights
The Eurasian bark beetle, Ips typographus L. (Coleoptera: Curculionidae, Scolytinae) is one of the important forest pests in the stands of Picea abies
I. typographus in Poland originating from the Baltic areas of Norway spruce was made by Siemaszko (1939). He reported that C. polonica, O. penicillatum, O. piceae, O. minutum and Graphium pycnocephalum were associated with
Twelve species of the ophiostomatoid fungi were found on the four study plots
Summary
The Eurasian bark beetle, Ips typographus L. (Coleoptera: Curculionidae, Scolytinae) is one of the important forest pests in the stands of Picea abies. (Coleoptera: Curculionidae, Scolytinae) is one of the important forest pests in the stands of Picea abies. The Eurasian bark beetle, Ips typographus L. It is a very aggressive species on P. abies trees, but other Picea species are occasionally colonized. When the populations of I. typographus increase to a high level, this insect can kill millions of spruce trees (Michalski 1998). During outbreaks of the spruce bark beetle, other tree genera like Larix Mill., Pseudotsuga Carrière, Pinus L. and Abies Mill. A high aggressiveness of spruce bark beetle, I. typographus may be explained by possession of effective aggregation pheromones, a high tolerance to host tree resins and transmittion of phytopathogenic blue-stain fungi (Christiansen and Solheim 1990).
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