The analysis of the spatial attack pattern of an endemic Douglas-fir beetle population Public Deposited

http://ir.library.oregonstate.edu/concern/defaults/1831cm12f

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  • The attack spatial pattern of the Douglas-fir beetle, Dendroctonus pseudotsugae Hopkins was shown to be regular within a given subarea of bark on its host, Pseudotsugae menziesii (Mirb.) Franco. Empirical arguments were advanced which indicated the uniform spacing of attacks was the result of a beetle controlled spacing mechanism dependent on the production of 3-methyl-2-cyclohexen-l-one (MCH-one). Tests of selected treatments in the field showed that virgin females in bolts, screened in such a way that the closest another beetle could approach in any direction was 1.24 cm, were more successful in eliciting attack responses than any other treatment. Field tests also showed that attacking beetles preferred to attack trees with rough bark texture as smooth bark trees were less heavily infested.
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  • Master files scanned at 600 ppi (256 Grayscale) using Capture Perfect 3.0 on a Canon DR-9080C in TIF format. PDF derivative scanned at 300 ppi (256 B&W), using Capture Perfect 3.0, on a Canon DR-9080C. CVista PdfCompressor 3.1 was used for pdf compression and textual OCR.
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  • description.provenance : Made available in DSpace on 2008-01-29T21:27:02Z (GMT). No. of bitstreams: 1 Internal Report_76.pdf: 304371 bytes, checksum: 265078904fd108111e5cf14e26050c30 (MD5) Previous issue date: 1972
  • description.provenance : Submitted by Adam Powell (apscanner@gmail.com) on 2008-01-24T23:15:12Z No. of bitstreams: 1 Internal Report_76.pdf: 304371 bytes, checksum: 265078904fd108111e5cf14e26050c30 (MD5)
  • description.provenance : Approved for entry into archive by Laura Wilson(laura.wilson@oregonstate.edu) on 2008-01-29T21:27:01Z (GMT) No. of bitstreams: 1 Internal Report_76.pdf: 304371 bytes, checksum: 265078904fd108111e5cf14e26050c30 (MD5)

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