PRIMARY ATTRACTION OF IPS LATIDENS (LECONTE) AND HYLASTES GRACILIS LECONTE (COLEOPTERA: SCOLYTIDAE) TO HIGH-GIRDLED LODGEPOLE PINE, PINUS CONTORTA VAR. LATIFOLIA ENGELMANN

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Abstract
In the absence of secondary attraction, 2 species of Scolytidae, Ips latidens (LeConte) and Hylastes gracilis LeConte, showed significant preference while in flight for high-girdled over non-girdled lodgepole pines, Pinus contorta var. latifolia Engelmann. In contrast, beetles in 2 genera of Elateridae, Ampedus and Ctenicera, showed significant preference for non-girdled over high-girdled lodgepole pines. Beetles in 12 other families, as well as other scolytids and elaterids, did not show any significant preference or aversion to high-girdled trees. This is the first clear demonstration of primary attraction for a North American Ips species and the second for an Hylastes species.