Abstract

Bark and ambrosia beetles (Coleoptera: Curculionidae:Scolytinae) include many important pest species of forest and fruit trees.  They usually prefer the physiologically stressed trees for colonization but also it is known that they attack healthy trees. Bark and ambrosia beetles are consisted of two main ecological groups, bark beetles grow in bark and ambrosia beetles in sapwood. Especially ambrosia beetles are very detrimental in Turkish hazelnut orchards. This study was carried out between 2005 and 2007 to monitor populations ofXyleborus dispar and Xyleborinus saxesenii (Col.: Scolytidae), causing considerable damages in hazelnut (Corylus avellana L.) orchards in Ordu and Samsun Provinces. The populations of the bark beetles were monitored using sticky traps with red wings that are registered and used to capture these pests. Ethyl alcohol (96%) was used as the attractant in the traps. The results of the three-year study indicated that both pest species emerged in different times in Ordu and Samsun. X. dispar emerged in large numbers in springs (March - May) as overwintered adults; however, X. saxesenii emerged in large numbers in summers (June - August). Population density is usually the X. dispar was found to be more.  X. dispar on 05.15.2007 (398 adult/trap), X. saxesenii on.09.01.2005 (383 adult/trap) the highest catch was recorded in Samsun province.

Key words: Hazelnut, monitoring population, Xyleborus dispar, Xyleborinus saxesenii, red winged sticky traps.