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Filtering by: Subject Root rots Decade 1970-1979 Degree Field Botany 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
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