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Impact of insects on seed production in a Douglas-fir seed orchard in Oregon

Creator:: Dombrosky, Scott A.
Abstract:: The impact of various factors on seed production in a Douglas-fir (Pseudotsuga menziesii) seed orchard in western Oregon was examined by monitoring the fate of seeds in thirty cones, stratified into three crown levels, on each of ten trees during the 1984 growing season. Cones were examined monthly between April...
Resource Type:: Masters Thesis
Full Text:: Impact of insects on seed production in a Douglas-fir seed

Some environmental factors affecting development and emergence of the Douglas-fir beetle, Dendroctonus pseudotsugae Hopkins (Coleoptera: Scolytidae), in the laboratory

Creator:: Ryan, Roger B.
Resource Type:: Masters Thesis
Full Text:: emergence of the douglas-fir beetle, Dendroctonus pseudotsugae Hopkins (Coleoptera: scolytidae) in the

Insect enemies of Dendroctonus pseudotsugae Hopk. : indentification of their immature stages and distribution in standing trees

Creator:: Kline, LeRoy N.
Abstract:: The objectives undertaken in this study were: 1) to develop means of identifying the immature stages of the known insect predators and parasites of the Douglas-fir beetle; 2) to investigate the possible distribution, spatially and/or temporal, of the known insect predators and parasites in standing trees infested by the Douglas-fir...
Resource Type:: Masters Thesis
Full Text:: predators and parasites of the Douglas - fir beetle; 2) to investigate the possible distribution

The biologies of two dipterous predators of Dendroctonus pseudotsugae Hopkins (Coleoptera : Scolytdae) in western Oregon and Washington

Creator:: Johnsey, Richard Lee
Abstract:: The objectives of this study were: 1) to learn the life history and habits of Medetera aldrichii Wheeler and a Lonchaea sp. in association with the Douglas-fir beetle, Dendroctonus pseudotsugae Hopkins, in western Oregon and Washington; 2) to determine if the larvae of M. aldrichii were predaceous on the Douglas-fir...
Resource Type:: Masters Thesis
Full Text:: Lonchaea sp. in association with the Douglas-fir beetle, Dendroctonus pseudotsugae Hopkins, in western

The flight and olfactory behavior of checkered beetles (Coleoptera cleridae) predatory on the douglas-fir beetle

Creator:: Harwood, Willard Garland
Abstract:: Three coleopterous predators associated with the Douglas-fir beetle (Dendroctonus pseudotsugae Hopkins in a second growth forest of Douglas-fir (Pseudotsugae menziesii (Mirb. ) Franco) in western Oregon are Enoclerus sphegeus Fabriciup, E, lecontei Wolcott, and Thanasirnus undatulus Say. A study was undertaken with the following objectives: (1) to determine the diurnal...
Resource Type:: Masters Thesis
Full Text:: OLFACTORY BEHAVIOR OF CHECKERED BEETLES (COLEOPTERA:CLERIDAE) PREDATORY ON THE DOUGLAS -FIR BEETLE in

Some aspects of scolytid behaviour with special reference to the Douglas-fir beetle Dendroctonus pseudotsugae Hopk. (Coleoptera : Scolytidae)

Creator:: Atkins, Michael D.
Resource Type:: Dissertation
Full Text:: fllght thus nay be involved ta behavloral changes, rn the Douglas-fir beetle there seens to be a oo

Certain biotic factors influencing the invasion and survival of the Douglas-fir beetle Dendroctonus pseudotsugae Hopkins (Coleoptera : scolytidae) in fallen trees

Creator:: Hendrickson, William Henry
Abstract:: Factors considered were phloem moisture, sour-phloem (which may be furthered by the presence of ample phloem moisture), oleoresin of the host, and the presence of unmated female beetles in suitable host material. Levels of phloem moisture present in variously prepared logs in the field ranged from about 100 to upwards...
Resource Type:: Dissertation
Full Text:: Certain Biotic Factors Influencing the Invasion and Survival of the Douglas-Fir Beetle Derulros.llonus

The bionomics of Medetera aldrichii Wheeler (Diptera: Dolichopodidae) in western Oregon

Creator:: Fitzgerald, T. D. (Terrence D.), 1941-
Abstract:: The bionomics of Medetera aldrichii Wheeler (Diptera: Dolichopodidae), a predator of the Douglas-fir beetle (Dendroctonus pseudotsugae Hopkins (Coleoptera:Scolytidae)), was investigated in western Oregon. The predator pupated in host galleries proximal to bark beetle ventilation holes. The tendency of prepupal larvae to form pupal cells near illuminated areas in a photo-response...
Resource Type:: Dissertation
Full Text:: The bionomics of Medetera aldrichii Wheeler (Diptera: Dolichopodidae), a predator of the Douglas-fir

Life table analysis of Douglas-fir beetle (Dendroctonus pseudotsugae Hopk.) populations

Creator:: Howse, Gordon M.
Resource Type:: Dissertation
Full Text:: ANALYSIS OF DOUGLAS-FIR BEETLE (DENDROCTONUS PSEUDOTSUGAE HOPK.) POPULATIONS Redacted for Privacy W. P

Pheromone-mediated behavior of adult Douglas-fir tussock moths, Orgyia pseudotsugata (McD.) (Lepidoptera: Lymantriidae)

Creator:: Swaby, James Archie
Abstract:: The sinuous flight behavior of male Douglas-fir tussock moths, Orgyia pseudotsugata, (McD.), is characterized by positive anemotaxis and positive chemoklinotaxis and varies depending on distance from the pheromone source, population density, and time of day. Visual cues play a minor role in close-range orientation to a pheromone source, but males...
Resource Type:: Dissertation
Full Text:: Pheromone-mediated behavior of adult Douglas-fir tussock

ScholarsArchive@OSU

Impact of insects on seed production in a Douglas-fir seed orchard in Oregon

Some environmental factors affecting development and emergence of the Douglas-fir beetle, Dendroctonus pseudotsugae Hopkins (Coleoptera: Scolytidae), in the laboratory

Insect enemies of Dendroctonus pseudotsugae Hopk. : indentification of their immature stages and distribution in standing trees

The biologies of two dipterous predators of Dendroctonus pseudotsugae Hopkins (Coleoptera : Scolytdae) in western Oregon and Washington

The flight and olfactory behavior of checkered beetles (Coleoptera cleridae) predatory on the douglas-fir beetle

Some aspects of scolytid behaviour with special reference to the Douglas-fir beetle Dendroctonus pseudotsugae Hopk. (Coleoptera : Scolytidae)

Certain biotic factors influencing the invasion and survival of the Douglas-fir beetle Dendroctonus pseudotsugae Hopkins (Coleoptera : scolytidae) in fallen trees

The bionomics of Medetera aldrichii Wheeler (Diptera: Dolichopodidae) in western Oregon

Life table analysis of Douglas-fir beetle (Dendroctonus pseudotsugae Hopk.) populations

Pheromone-mediated behavior of adult Douglas-fir tussock moths, Orgyia pseudotsugata (McD.) (Lepidoptera: Lymantriidae)

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