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  • Growth and yield of western larch under controlled levels of stocking in the Blue Mountains of Oregon

    Creator:
    Cochran, P.H.
    Abstract:
    Repeated thinning to five growing-stock levels resulted in widely differing tree sizes and volumes per acre after 30 years. Largest trees but the least cubic-volume yield per acre were produced in the heaviest thinning level, whereas highest board-foot yields were found in intermediate thinning levels. partial defoliation by larch casebearer...
    Resource Type:
    Technical Report

  • Twenty-five-year response of Larix occidentalis stem form to five stand density regimes in the Blue Mountains of eastern Oregon

    Creator:
    Lennette, Andrew P.
    Abstract:
    Upper-stem diameter measurements from a levels-of-growing-stock study on Larix occidentalis in the Blue Mountains of eastern Oregon were collected over a 25 year period with an optical dendrometer. The following hypotheses were tested with these data: 1) stand density regime has a significant effect on stem form; and 2) crown...
    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:
    degree of Master of Science in Forest Science presented on January 15. 2004. Title: Western Larch

  • Effect of plant date on subsequent seedling field performance

    Creator:
    Taylor, Michael Monroe
    Abstract:
    Douglas-fir (Psudotsuga menziesii (Mirb.) Franco) seedlings were outplanted on eight dates (every three weeks from mid-August 2005 through mid-January 2006). On each plant date, seedlings from a conventional dormancy (CONV) induction treatment, including moisture and nutrient stress, and a shortened daylength (SD) treatment were outplanted on three western Oregon sites...
    Resource Type:
    Masters Thesis
    Full Text:
    WESTERN LARCH SEEDLINGS ON THE EAST SIDE OF THE CASCADE MOUNTAINS IN WASHINGTON ............ 96 3.1

  • 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

  • Seedling response to vegetation management in northeastern Oregon

    Creator:
    Lindsay, Amanda A.
    Abstract:
    Northeastern Oregon geology and climate provides moderately productive conditions for forest management and timber production. Although site preparation and planting are commonly used silvicultural practices, little research exists on the efficacy of specific forest herbicides and responses of seedling survival and growth in this region. This research seeks to improve...
    Resource Type:
    Masters Thesis
    Full Text:
    chemical site preparation treatments and several responses: western larch (Larix occidentalis) and