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Fungal diversity within decomposing woody conifer roots in Oregon

Creator:: Vandegrift, V. Eleanor
Abstract:: Previous studies have indicated that roots from five tree species (Picea sitchensis, Tsuga heterophylla, Pseudotsuga menziesii, Pinus ponderosa, and Pinus contorta) decompose at different rates across an environmental gradient in Oregon. Measurements of wood chemistry from each tree species as well as moisture and temperature from each location do not...
Resource Type:: Masters Thesis
Full Text:: was extracted from hyphae samples collected directly from roots, and fungi cultured from root chips

Fungal root pathogen interactions in a mixed conifer forest in the Blue Mountains of northeastern Oregon

Creator:: Ferguson, Brennan Angus
Abstract:: The coniferous forests of the Pacific Northwest are affected by a variety of endemic fungal root pathogens. Forest disease surveys have noted the presence of two or more of these root pathogens infecting the same stump or root, and it has been suggested that these fungi may be interacting synergistically....
Resource Type:: Masters Thesis

Effects of nutrient and light limitation on mountain hemlock : susceptibility to laminated root rot

Creator:: Matson, P. A. (Pamela A.)
Abstract:: Mountain hemlock forests in the Oregon Cascades exhibit wave-form dieback resulting from infection by laminated root rot (Phellinus weirii). Although Phellinus remains viable in dead roots after the wave of dieback passes, many regenerating mountain hemlock forests do not become immediately reinfected. We measured at least a doubling of nitrogen...
Resource Type:: Dissertation

RFLP analysis of genetic variation in the laminated-root-rot fungal pathogen of conifers, Phellinus weirii

Creator:: Bae, Hanhong
Abstract:: DNA markers that detect polymorphisms within and between two biological species of the coniferous laminated-root-rot fungus Phellinus weirii were developed and used to measure the amount and distribution of genetic variation. In a preliminary survey, total cellular DNA from 3 Douglas-fir-type isolates and 3 cedar-type isolates was digested with 12...
Resource Type:: Masters Thesis

Impact of Armillaria and annosus root diseases on stand and canopy structure, species diversity, and down woody material in a central Oregon mixed-conifer forest

Creator:: Fields, Kristen L. N.
Abstract:: White and grand fir are both valuable components of the mixed-conifer stand structure managed for late-successional reserves in central Oregon. However, they are often short-lived species because of high susceptibility to root diseases, defoliating insects, bark beetles, and wildfire. This study focuses on the effects of root diseases caused by...
Resource Type:: Masters Thesis
Full Text:: of root disease. There was a significant negative relationship between amounts of canopy cover and

Toxicity of methyl bromide to fungi inhabiting Dahurian larch wood

Creator:: Rhatigan, Ronald G.
Abstract:: Concerns over the possibility of exotic pest introductions from eastern Russia to the West Coast of the United States due to proposed log imports raises the question of the effectiveness of possible mitigation measures. Toxicity of methyl bromide to representative pathogenic fungi was tested by exposing Armillaria ostoyae, Heterobasidion annosum,...
Resource Type:: Masters Thesis

Western larch resistance to Douglas-fir beetle attack

Creator:: Neal, Tiffany A.
Abstract:: Live western larch, Larix occidentalis Nutt., a tree species resistant to the Douglas-fir beetle, Dendroctonus pseudotsugae Hopkins, produces the monoterpene 3-carene in higher concentrations compared to Douglas-fir, the preferred host of D. pseudotsugae (Reed et al. 1986). The inhibitory effects on attraction to aggregation pheromones and toxicity of 3-carene to...
Resource Type:: Masters Thesis
Full Text:: light, moisture, and nutrient deficiencies, disease, or old age. 2.3.3 Counter-Offensive Adaptation

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

Creator:: Dodds, Kevin J.
Abstract:: 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...
Resource Type:: Dissertation

Thinning and urea fertilization effects on emerging grand fir (Abies grandis) foliage and growth of western spruce budworm (Choristoneura occidentalis) larvae

Creator:: Savage, Thomas J.
Abstract:: The objective of this study was to determine how the balance of carbon to nitrogen in a grand fir ecosystem affects the chemistry of emerging grand fir foliage and the growth of western spruce budworm larvae. Forest plots in the grand fir zone of eastern Oregon were thinned, thinned and...
Resource Type:: Masters Thesis

Predators of hemlock woolly adelgid in northwestern Oregon

Creator:: Byrkit, Maggie K.
Abstract:: Hemlock woolly adelgid, Adelges tsugae Annand, is a serious threat to eastern hemlock, Tsuga canadensis Carriere, in the eastern United States. Infestations of A. tsugae are spreading rapidly and tree mortality caused by the insect is increasing yearly. As part of an integrated management approach, a classical biological control program...
Resource Type:: Masters Thesis
Full Text:: . Importation and release of exotic enemies has been repeatedly used as a means of biological control of pest

ScholarsArchive@OSU

Fungal diversity within decomposing woody conifer roots in Oregon

Fungal root pathogen interactions in a mixed conifer forest in the Blue Mountains of northeastern Oregon

Effects of nutrient and light limitation on mountain hemlock : susceptibility to laminated root rot

RFLP analysis of genetic variation in the laminated-root-rot fungal pathogen of conifers, Phellinus weirii

Impact of Armillaria and annosus root diseases on stand and canopy structure, species diversity, and down woody material in a central Oregon mixed-conifer forest

Toxicity of methyl bromide to fungi inhabiting Dahurian larch wood

Western larch resistance to Douglas-fir beetle attack

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

Thinning and urea fertilization effects on emerging grand fir (Abies grandis) foliage and growth of western spruce budworm (Choristoneura occidentalis) larvae

Predators of hemlock woolly adelgid in northwestern Oregon

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