Abstract
Chemical communication of the four-eyed fir bark beetle Polygraphus proximus Blandf., an aggressive invasive pest of the Siberian fir Abies sibirica Ledeb., was experimentally studied using a four-way olfactometer of a modified design, in which the tested insects were allowed to move on their own from a lightproof plastic container onto the lighted arena. Young hibernated adults of P. proximus were offered four variants of odor: fir log segments infested with (1) 10 males, (2) 10 females, (3) 10 couples of P. proximus, and (4) clean air as the control. The pheromone of P. proximus was shown to be produced by females; a similar response of both sexes characterized it as an aggregation pheromone. All the three variants with infested fir logs were much more attractive than the control variant with clean air. Volatiles from fir tissues not only seem to serve as markers facilitating host selection by the first-to-arrive beetles before direct contact with the tree bark, but also to be used as pheromone precursors or synergists. The absence of difference in response to the logs infested with males and couples of the bark beetle indicated that pheromone synthesis was inhibited after couple formation.
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Kerchev, I.A., Pousheva, M.S. Olfactometric evidence for aggregation pheromone production by females of the four-eyed fir bark beetle Polygraphus proximus Blandf. (Coleoptera, Curculionidae: Scolytinae). Entmol. Rev. 96, 821–825 (2016). https://doi.org/10.1134/S0013873816070010
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DOI: https://doi.org/10.1134/S0013873816070010