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Filtering by: Subject Root rots Advisor Roth, Lewis F. Non-Academic Affiliation Oregon State University. Graduate School

The importance of root grafting in the spread of phytophthora root rot in an immature stand of Port-Orford-cedar

Creator:

Gordon, Donald E.

Abstract:

The root pathogen, Phytophthora lateralis Tucker and Milbrath, continues its destructive spread among Port-Orford Cedars (Chamaecyparis lawsoniana (Murr.) Parl.) of southwestern Oregon. This thesis concerns spread of the fungus between root systems of individual trees in a 49-year-old stand predominantly of Port-Orford- Cedar. The contribution of root grafts to spread...

Resource Type:

Masters Thesis
Poria weirii root rot of Douglas-fir : survival of the pathogen and infection of the host

Creator:

Nelson, E. E.

Resource Type:

Dissertation

Full Text:

Poria weirii root rot of douglas-fir: survival of the
Distribution and variation of Armillariella mellea clones in relation to vegetative cover and severity of root rot in Ponderosa pine

Creator:

Cooley, Sally Joan

Abstract:

Root rot due to Armillariella mellea (Vahl. ex Fr.) Karst. is unusually severe in ponderosa pine near Glenwood, Washington. Isolate relations, clonal variability, vegetation patterns, and climate were examined in relation to severity of disease in this area. Ninety-one isolates from 70 infection centers were examined. Pairings of neighboring isolates...

Resource Type:

Masters Thesis

Full Text:

in relation to vegetative cover and severity of root rot in Ponderosa pine AN ABSTRACT OF THE