Kamal J. K. Gandhi, gandh004@umn.edu1, Daniel W. Gilmore, dgilmore@umn.edu1, Robert A. Haack, rhaack@fs.fed.us2, Steven A. Katovich2, William J. Mattson, wmattson@fs.fed.us2, John C. Zasada2, and Steven J. Seybold, ssseybold@fs.fed.us3. (1) University of Minnesota, Departments of Entomology and Forest Resources, Davis, CA, (2) USDA Forest Service, North Central Research Station, East Lansing, MI, (3) Chemical Ecology of Forest Insects, USDA Forest Service, Pacific Southwest Research Station, 720 Olive Drive, Suite D, Davis, CA
Ips species (Coleoptera: Scolytidae) that colonize the phloem of conifers in North American sub-boreal forests include I. perturbatus, I. perroti, I. pini, and I. grandicollis. These species are important both ecologically and economically as they are among the first colonizers of living and moribund pine and spruce trees, and along with their associates, they numerically dominate the subcortical insect guild. Intraspecific behavioral chemical signaling is generally used by scolytid species to locate and mass attack host trees and for feeding and reproduction. We studied the responses of these Ips spp. to various semiochemical blends on 16 plots in jack pine-dominated forests in Superior National Forest in northeastern Minnesota. During the summers of 2000-2003, we trapped scolytids and their associates using ten Lindgren funnel traps per plot. Each trap was baited with a synthetic attractant that targeted specific scolytids or woodborers; one trap was unbaited (control). Preliminary results indicate that, in agreement with the literature, I. perturbatus and I. pini responded strongly to the combinations of [(–)-ipsenol, (+)-ipsdienol and (–)-cis-verbenol], and [(+/–)-ipsdienol and lanierone], respectively. However, in contrast to the literature, I. perroti responded strongly to the combinations of [(–)-ipsenol and (–)-ipsdienol], rather than to [(–)-ipsenol and (+)-ipsdienol]. Semiochemical baited funnel traps are useful tools for defining native biodiversity. We also trapped nine, three, and two species of Cleridae, Platysoma (Histeridae), and Corticeus (Tenebrionidae), respectively, which are known to be important coleopteran predators of scolytids.
Species 1: Coleoptera Curculionidae
Ips piniSpecies 2: Coleoptera Tenebrionidae
Corticeus tenuisSpecies 3: Coleoptera Cleridae
Keywords: Semiochemicals, Predators
Recorded presentation