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Natural-history traits suspected behind interspecific variations of bark- and wood-boring beetles in response to trap size and design

par Caiti, Emilio ;Hasbroucq, Séverine ;Grégoire, Jean-Claude
Référence Scientific Reports, 15, page (34272)
Publication Publié, 2025-10-01

Article révisé par les pairs

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Résumé :

The performances of traps used for pest monitoring are not well understood. Variable trap sizesand shapes make cross-comparisons difficult. We tested with four Scolytinae species (Coleoptera,Curculionidae) a set of traps of the same model (fan-traps) in four sizes (310, 536, 832.5, 1,200cm2), and a larger trap with another design (a four-vane trap, 4,500 cm2). A significantly linearrelationship was observed between trap sizes and catches for Pityogenes chalcographus, but thecatches of Ips typographus, Trypodendron lineatum and T. signatum tapered off. In the literature,comparable tapering-off effects were observed with Xyleborus glabratus (Scolytinae) and Agrilusplanipennis (Coleoptera, Buprestidae), but a significant linear response with increasing trap size wasobserved with Trypodendron lineatum and T. rufitarsus. In another test, beetle landing behaviour wasmeasured on a 1 m2 glued panel baited with lineatin (the Trypodendron spp. pheromone) and ethanol(a host kairomone). The landing densities of Trypodendron spp. did not increase with the distanceto the attractants whilst Anisandrus dispar landed in very significantly higher densities far from theattractants. Species using pheromones to locate mate and host appear to land closer to the source ofattractants than species responding to kairomones for locating a suitable host.