Primary attraction in host recognition of coniferous bark beetles and bark weevils (Col., Scolytidae and Curculionidae)
1993
Tunset, K. | Nilssen, A.C. | Andersen, J.
The hypothesis of primary attraction in Scolytidae and Curculionidae was tested in the field from late May throughout June 1979 and 1980 with 20 and 14 flight traps, respectively. The traps, designed especially to exclude the possibility of secondary attraction, were baited with billets of Scots pine (Pinus sylvestris) or Norway spruce (Picea abies), and empty controls. Tomicus piniperda, Hylastes brunneus, Hylastes cunicularius, Pityogenes bidentatus, Pityogenes chalcographus, Hylobius abietis and Pissodes pini were significantly more frequently caught in traps baited with pine or spruce than to empty controls, and the random flight hypothesis was rejected. The same species, except P. chalcographus, were also able to discriminate significantly between pine and spruce before landing. H. cunicularius was exclusively attracted to traps baited with Norway spruce, whereas the rest of the species preferred the traps baited with Scots pine. The mechanism used by the beetles in their host selection is olfactory sensing of chemical compounds. Host acceptance and nonhost rejecting starts before landing, implying the ability to perceive plant characteristics at a distance (primary attraction)
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