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  • The effects of defoliation on yellow starthistle (Centaurea solstitialis L.) reproductive capacity

    Creator:
    Schumacher, Stacy
    Abstract:
    Yellow starthistle (Centaurea solstitialis L.) is an introduced Asteraceae that has become established on 10 million acres in the Pacific Northwest and California. This weed functions as an annual or short-lived perennial and depends on seeds for reproduction. Strategies of control that reduce plant fitness or lower seed production or...
    Resource Type:
    Masters Thesis
    Full Text:
    plant following four different defoliation treatments in northeastern Oregon 36 6. Seedhead diameter

  • Growth responses of Douglas-fir (Pseudotsuga menziesii [Mirb.] Franco) to defoliation

    Creator:
    Osman, Khalid Amir
    Abstract:
    The effect of defoliation intensity and season on Douglas-fir growth were studied in three replications in the Siuslaw National Forest during 1988-1990. Four intensities of defoliation were applied once in either spring or summer 1988. Stem diameter and canopy area were linearly inversely proportional to the level of defoliation. Defoliation...
    Resource Type:
    Dissertation
    Full Text:
    Defoliation. Khalid A. Osman and Steven H. Sharrow Department of Rangeland Resources, Oregon State