Wednesday, December 12, 2007
D0687

Responses of the redhaired pine bark beetle, Hylurgus ligniperda (Coleoptera: Scolytidae), and associated subcortical Coleoptera to host volatiles in the southern California urban landscape

Mary Louise Flint, mlflint@ucdavis.edu, University of California, Entomology, One Shields Ave, Davis, CA, Deguang Liu, dgliu@ucdavis.edu, University of California, Davis, Entomology, 720 Olive Drive, Suite D, Davis, CA, Jana C. Lee, jana.lee@ars.usda.gov, USDA ARS, 3420 NW Orchard Ave, Corvallis, OR, Robert Beiriger, Bostrichid@mail.ifas.ufl.edu, University of Florida, IFAS-EREC, 3200 E. Palm Beach Rd, Belle Glade, FL, Richard L. Penrose, dpenrose@cdfa.ca.gov, California Department of Food and Agriculture, Plant Health and Pest Prevention Services, 3294 Meadowview Road, Sacramento, CA, Donald E. Bright, dbright@lamar.colostate.edu, C.P. Gillette Museum of Insect Diversity, Department of Bioagricultural Sciences and Pest Management, Colorado State University, Fort Collins, CO, and Steven J. Seybold, sseybold@fs.fed.us, USDA Forest Service, 720 Olive Drive, Suite D, Davis, CA.

A field bioassay (2006-2007) of the flight response of the invasive redhaired pine bark beetle (RPBB), Hylurgus ligniperda (F.), was conducted in southern California. Lindgren funnel trap catches showed that (–)-á-pinene and ethanol functioned synergistically as an attractant for both sexes. Ethanol was not attractive alone, but (–)-á-pinene was moderately attractive to both sexes. Seasonal flight activity data from this study and from a wider statewide survey (2003-2006) suggested that the flight of RPBB occurred year round with major peaks in May and July, but was relatively low from August to late January. A wide range of other subcortical Coleoptera were trapped in the experiment including 22 species of Scolytidae, six species of Bostrichidae, three species of Colydiidae, and five species of Cerambycidae. Another invasive scolytid, Xyleborinus saxeseni (Ratzeburg), it responded significantly to any treatment containing ethanol and also flew year round in southern California. A native root-feeding bark beetle, Hylastes tenuis Eichhoff, responded to treatments similarly to RPBB, with a significant and synergistic response to ethanol and á-pinene. Both sexes of three native species of false powderpost beetles [Amphicerus cornutus (Pallas), Scobicia declivis (LeConte), and S. suturalis (Horn) (Coleoptera: Bostrichidae)] responded significantly to any treatment containing ethanol and flew from April to October in southern California. Both sexes of another invasive subcortical beetle, the longhorned borer, Arhopalus syriacus (Reitter) (Coleoptera: Cerambycidae) were significantly attracted to treatments with (–)-á-pinene.


Species 1: Coleoptera Curculionidae (Scolytidae) Hylurgus ligniperda (redhaired pine bark beetle)