Basic and applied studies on Douglas-fir beetle : spatial relationships of infestations, lipids and host habitat, and attraction distances of pheromone-baited traps Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/td96k586z

Descriptions

Attribute NameValues
Creator
Abstract or Summary
  • Three studies on Douglas-fir beetle (DFB), Dendroctonuspseudotsuae, were conducted to investigate its basic and applied biology. Studies included investigations into the spatial relationship of DFB infestations over multiple years and multiple landscapes, relationships between DFB brood adult lipid levels and position of development along the length of tree boles, and determination of the attraction distances of DFB pheromone-baited traps. Distances between infestations varied, but in general as DFB populations increased, distance to nearest infestation declined. When DFB populations were epidemic, 88% of within-year infestations were < 1,000 m from other infestations. Between-year average nearest neighbor distances followed a similar pattern to within-year distances. During periods of endemic populations, there was a wide range in distances between infestations. Risk ratings were developed for each ranger district studied as well as an overall average risk rating for the region.There were no significant differences in brood adult lipid levels in relation to bole position, phloem width, or bark width found in the study on brood position and lipid levels. Numbers of attacks, larval galleries, brood adults, and parasitoids did not differ significantly by tree bole position. Results from this study suggest Douglas-fir beetle does not benefit, in the form of increased lipid levels, from oviposition at different bole positions. The study on attraction distances of DFB pheromone-baited traps determined distances helpful for management of this bark beetle. Two mark-recapture and one trap interference study were conducted to determine the sampling range and range of attraction of DFB pheromone-baited traps. Mark-recapture studies indicated that most D. pseudotsugae were recaptured from distances < 200 m from the pheromone-baited trap. Results of the trap interference experiment provided no insight into the range of attraction of D. pseudotsugue pheromones.
Resource Type
Date Available
Date Copyright
Date Issued
Degree Level
Degree Name
Degree Field
Degree Grantor
Commencement Year
Advisor
Committee Member
Academic Affiliation
Non-Academic Affiliation
Subject
Rights Statement
Language
Digitization Specifications
  • PDF derivative scanned at 300 ppi (256 B+W), using Capture Perfect 3.0, on a Canon DR-9080C. CVista PdfCompressor 4.0 was used for pdf compression and textual OCR.
Replaces
Additional Information
  • description.provenance : Approved for entry into archive by Linda Kathman(linda.kathman@oregonstate.edu) on 2009-02-16T18:05:29Z (GMT) No. of bitstreams: 1 Dodds_Kevin_J_2003.pdf: 1172797 bytes, checksum: 8f3b38ac27f154f58e383b0d66f751d1 (MD5)
  • description.provenance : Made available in DSpace on 2009-02-16T18:05:29Z (GMT). No. of bitstreams: 1 Dodds_Kevin_J_2003.pdf: 1172797 bytes, checksum: 8f3b38ac27f154f58e383b0d66f751d1 (MD5)
  • description.provenance : Submitted by Anna Opoien (aoscanner@gmail.com) on 2009-02-13T00:02:04Z No. of bitstreams: 1 Dodds_Kevin_J_2003.pdf: 1172797 bytes, checksum: 8f3b38ac27f154f58e383b0d66f751d1 (MD5)
  • description.provenance : Approved for entry into archive by Linda Kathman(linda.kathman@oregonstate.edu) on 2009-02-16T18:03:46Z (GMT) No. of bitstreams: 1 Dodds_Kevin_J_2003.pdf: 1172797 bytes, checksum: 8f3b38ac27f154f58e383b0d66f751d1 (MD5)

Relationships

Parents:

This work has no parents.

Last modified

Downloadable Content

Download PDF

Items