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Filtering by: Committee Member Roth, Lewis

The vegetation dynamics of Pinus contorta forest, Crater Lake National Park, Oregon

Creator:

Zeigler, Robert S.

Abstract:

This study describes the soils, vegetation and age structure of the Pinus contorta forests of Crater Lake National Park. Growth rates of P. contorta, and levels of infection and impact of dwarf mistletoe (Arceuthobium americanu1r) on growth of P. contorta individuals are compared among communities. Vegetation description is based on...

Resource Type:

Masters Thesis
Pathogenesis and intertree transmission of Verticicladiella wageneri in Douglas-fir (Pseudotsuga menziesii)

Creator:

Hessburg, Paul F.

Abstract:

Verticicladiella wageneri Kendr. is a vascular wilt pathogen of Douglas-fir in the Pacific Northwest, The disease is characterized by black staining of colonized sapwood; crown symptoms are those typical of a wilting syndrome. Histopathological studies revealed that the pathogen is limited to the xylem but causes vascular dysfunction in both...

Resource Type:

Dissertation

Full Text:

) Abstract approved: Redacted for Privacy Dr. Lewis F. Roth for Dr. Everett M. Hansen Verticicladiella