Monday, December 10, 2007 - 9:05 AM

In search of a good host: Movement of Warren root collar weevil among live and dead lodgepole pine

Matthew Klingenberg, mklingenberg@gmail.com1, Staffan Lindgren, lindgren@unbc.ca1, Niklas Bjorklund, Niklas.Bjorklund@ekol.slu.se2, and Brian Aukema, baukema@pfc.cfs.nrcan.gc.ca1. (1) University of Northern British Columbia, 3333 University Way, Prince George, BC, Canada, (2) Swedish University of Agricultural Sciences, Department of Ecology, S-750 07, Uppsala, BC, Sweden

Warren root collar weevil (Hylobius warreni) is a flightless insect distributed throughout northern coniferous forests. It feeds on all life stages of pines. Adult trees are rarely harmed, but larval feeding may girdle and kill young trees. The insect is an emerging silvicultural concern in western Canada as the current outbreak of mountain pine beetle (Dendroctonus ponderosae) has reduced the available host pool of mature pine for weevils. Field observations have suggested that weevils are migrating from mature pine stands killed by mountain pine beetle into adjacent, newly replanted areas. Little information exists, however, on the actual movement of this nocturnal, flightless insect. We present data on mark-resight experiments conducted in three plantations crafted with differing patterns of live and dead trees. Following release of three hundred test subjects, daily movement patterns were recorded on a per tree basis using a novel trapping method that yielded >25% recapture rates. By assessing insect movement through plantations of live and dead hosts, we may better inform resource management strategies to mitigate the negative effects of Warren root collar weevils early in stand replacement phases.

Species 1: Coleoptera Curculionidae Hylobius warreni (Warren root collar weevil)