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In air-polluted mountain areas of the Czech Republic, including the Ore Mountains, pure forest stands of introduced blue spruce (   Picea   pungens   ) were established in the 1980’s. We studied the   Symphyta   (  Hymenoptera  ) fauna in the canopies of these trees at four sites and in the canopies of adjacent    Picea   abies    trees at one of these sites by beating tree branches. For the first time, Nearctic blue spruce is reported as a host for 17 European species of   Symphyta   (sawflies). Diprionids in the genus    Gilpinia    were the most abundant sawflies on    P.   pungens    and were more abundant on    P.   pungens    than on the native    Picea   abies   . Spruce pamphiliids in the genus    Cephalcia    were also more abundant on    P.   pungens    than on    P.   abies   , while the abundances of representatives of the tenthredinid genera    Pikonema   ,    Pachynematus   , and    Pristiphora    were similar on    P.   pungens    and    P.   abies   . Our results indicate that many species of European spruce   Symphyta   are able to use the allochthonous species    P.   pungens    as a host.

Allochthonous blue spruce in Central Europe serves as a host for many native species of sawflies ( Hymenoptera , Symphyta )