%0 Article
%T The occurrence of bark beetles (Col., Scolytidae) in a dead spruce stand flooded by beavers (Castor canadensis Kuhl.) 
%A Saarenmaa, Hannu
%D 1978
%J Silva Fennica
%V 12
%N 3
%R doi:10.14214/sf.a14857
%U https://silvafennica.fi/article/5003
%X <p>&nbsp;</p>
<p>The aim of the study was to determine which kinds of insects had infected the Norway spruce (<em>Picea abies</em> (L.) H. Karst.) in different stands killed by flooding caused by beavers (<em>Castor canadensis</em> Kuhl), and if there was any danger that they would subsequently cause damage in the surrounding forests. The effect of tree diameter and certain stand characteristics on the fauna of dead trees are discussed. The occurrence of different insect combinations and qualifications for their coexistence were studied.</p>
<p><em>Pityogenes chalcographus</em> L., <em>Trypodendron lineatum</em> O.,<em> Hylurgops palliatus</em> Gyll. and <em>Dryocetes autographus</em> Ratz. occurred most abundantly. 20 phloem or wood boring species were observed in 5 regular succession types. Secondary species occurred in a virgin stand while <em>Ips typographus</em> L. was found at the edge of a felling area. Owing to the flooding, species preferring moist conditions were abundant. In this case damages had not spread to the surrounding forests which, however, might be possible under certain conditions.</p>
<p>The PDF includes a summary in English.</p>