ATTRACTION DURING FLIGHT OF SCOLYTIDS AND OTHER BARK-DWELLING AND WOOD-DWELLING BEETLES TO VOLATILES FROM FRESH AND STORED SPRUCE WOOD

Attraction of scolytids and other bark- and wood-dwelling beetles to v olatile constituents of Norway spruce (Picea abies (L.) Karst.) was st udied in field experiments in central Sweden. The volatiles were relea sed from chips of newly cut spruce stems as well as from stems stored over winter. These host materials were kept in cylinders covered on bo th ends with fine nylon mesh. Attracted insects were caught in barrier traps. The composition of volatile constituents of wood samples was d etermined using gas chromatography. Hylurgops palliatus (Gyll.), Hylas tes cunicularius Er., Ips typographus (L.) (Scolytidae), and Glischroc hilus quadripunctatus (L.) (Nitidulidae) were particularly attracted t o stored spruce wood. Trypodendron lineatum (Oliv.) (Scolytidae) and P ityophagus ferrugineus (L.) (Nitidulidae) were only attracted to store d wood. There were indications that Tomicus piniperda (L.) and Hylaste s brunneus Er. (Scolytidae) preferred fresh wood. Chemical analyses re vealed that during storage ethanol and acetaldehyde increased consider ably in two out of the five examined tree stems.