Abstract

Introduction: Central European Norway spruce monocultures face Ips typographus outbreaks due to decreasing resistance. These beetles use volatile compounds to communicate and select suitable host trees. Spruce trees, beetles, and their symbiotic ophiostomatoid fungi emit oxygenated monoterpenes, including 1,8-cineole, alpha-terpineol, camphor, carvone, terpinen-4-ol, isopinocamphone, and pinocamphone, and the phenylpropanoid estragole, particularly in the infestation phase. These compounds trigger strong responses in I. typographus antennae, motivating our field study.Objective: This study aimed to assess how adding these compounds to the aggregation pheromone of Ips typographus modulates the attraction of this bark beetle and its natural enemies.Methods: In combination with I. typographus pheromone, estragole, 1,8-cineole, (+/-)-camphor, (-)-carvone, alpha-terpineol, (-)-terpinen-4-ol, (+)-pinocamphone, and (+)-isopinocamphone at low, medium, and high doses were tested in pheromone traps at two sites in the Czech Republic.Results: All 1,8-cineole doses and the high estragole dose acted as anti-attractants for I. typographus, whereas all (+)-isopinocamphone doses enhanced their attraction to pheromone. Catches of natural enemies, the Staphylinidae and Pteromalidae, varied by location.Conclusion: 1,8-cineole, isopinocamphone, and estragole may play vital roles in tritrophic interactions among spruce trees, and I. typographus and its natural enemies, and these compounds may be developed into new or enhanced semiochemical-based pest control methods.

Keywords

Eurasian spruce bark beetle; host compounds; Pteromalidae; Staphylinidae; Norway spruce; Picea abies; spruce kairomone; pheromone traps

Published in

Frontiers in forests and global change
2023, Volume: 6, article number: 1292581
Publisher: FRONTIERS MEDIA SA

SLU Authors

• Schlyter, Fredrik

  • Department of Plant Protection Biology, Swedish University of Agricultural Sciences
    
  • Czech University of Life Sciences Prague

Associated SLU-program

SLU Plant Protection Network
SLU Forest Damage Center


UKÄ Subject classification

Forest Science
Ecology


Publication identifier

DOI: https://doi.org/10.3389/ffgc.2023.1292581

Permanent link to this page (URI)

https://res.slu.se/id/publ/127974