A review: chemical ecology of Ips typographus (Coleoptera, Scolytidae)

Abstract

Chemical ecology of the spruce bark beetle Ips typographus (L.) was reviewed. The outbreak of I. typographus in central Europe triggered extensive research on chemical ecology. Males initiate host location and produce semiochemicals which attract both males and females. A successful mass attack must first overcome the resistance of the host tree. Pioneer I. typographus evolved to use the resin flow of host trees as kairomones in host location, and synthesized semiochemicals initially to detoxify the resin. If small bark beetle populations infest healthy trees, mass attack is prevented by host resistance. Nine monoterpene alcohols were found in male hind-guts, including cis-verbenol (cV) and 2-methyl-3-buten-2-ol (MB) which are regarded as primary aggregation pheromones, and a low proportion of Ipsdienol (Id) which increases attractiveness of cV and MB. Verbenone (Vn) and Ipsenol (Ie) are anti-aggregation pheromones, that play important roles in adjusting attack density and insect density under the bark. Non-host volatiles are repellent to I. typographus, so that beetles do not waste energy boring into non-host trees. The relationship between host resistance, pheromone compounds and behavior, non-host volatiles, bioassays and mass trapping are reviewed. Results of field bioassays stressed that traps baited with specific pheromones could be used as a reasonable protection measure.

Keywords

Ips typographus / Pheromone / Aggregation pheromone / Parasitoids / Predator / Non-host volatiles / Control and management

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