Various Host-Insect Interrelations in Host-Finding and Colonization Behavior of Bark Beetles on Coniferous Trees

  • J. A. Rudinsky


Three aspects of the relationship beween the coniferous host tree and bark beetles of the family Scolytidae are analyzed, and recent results are summarized. 1) Host-plant-terpenes serve in the host-recognition mechanism by attracting or repelling certain species and by synergizing or enhancing insect pheromones. 2) Proposed biosynthetic pathways for bark beetle pheromones produced from host-plant substances include 3-methyl-2-cyclohexen-l-one from the monoterpene terpinolene through piperitenone followed by cleavage of the isopropylidene side chain, and the analog alcohol 3-methyl-2-cyclohexen-l-ol from reduction of the ketone. Also, trans-verbenol, verbenone, and myrtenol are believed to result from oxidation of alpha-pinene, and similarly pinocarvone by oxidation of beta-pinene. However, the suggestion that certain kinds of pheromone production occur only on the freshly attacked host-tree is not supported by evidence that newly emerged beetles already release the same pheromones. 3) The host-plant also serves as the dense medium or substrate for sonic communication by those bark beetles that produce sound signals — an aspect that has received no study. In various Dendroctonus species it is established that the acoustic and chemical signals function as both stimulus and response in host-finding and colonization behavior.


Bark Beetle Host Tree Sound Production Colonization Behavior Sonic Signal 
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Copyright information

© Akadémiai Kiadó, Budapest 1976

Authors and Affiliations

  • J. A. Rudinsky
    • 1
  1. 1.Oregon State UniversityCorvallisUSA

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