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Filtering by: Subject Douglas fir -- Fertilizers Degree Field Entomology Subject Douglas fir -- Diseases and pests

Population dynamics of the Douglas-fir cone moth, Barbara colfaciana (Kft.) (Lepidoptera:Olethreutidae)

Creator:

Nebeker, T. Evan

Abstract:

A population of the Douglas-fir cone moth, Barbara colfaxiana (Kft. ), was studied on the Buckhead Seed Production Area, Oakridge, Oregon, during 1971 and 1972. A method of estimating cone and insect populations is presented. Factors contributing to the mortality of B. colfaxiana are discussed, with resinosis being the critical...

Resource Type:

Dissertation

Full Text:

Population dynamics of the Douglas-fir cone moth
Insects associated with black stain root disease of Douglas-fir in western Oregon

Creator:

Witcosky, Jeffrey John

Abstract:

The root systems of Douglas-fir trees infected with Verticicladiella wagenerii and assigned by crown color and terminal growth characteristics to several stages of decline were excavated at three widely separated sites in the Coast Range of Oregon. Data were gathered on insect species present, extent of colonization of the root...

Resource Type:

Masters Thesis

Full Text:

Douglas-fir in western Oregon AN ABSTRACT OF THE THESIS OF Jeffrey John Witcosky for the degree of
The root insect-- black-stain root disease association in Douglas-fir : vector relationships and implications for forest management

Creator:

Witcosky, Jeffrey John

Abstract:

Verticicladiella wageneri Kendrick is a vascular wilt pathogen of conifers, causing a black staining of colonized sapwood of roots and lower stem. In Douglas-fir, V. wageneri is intimately associated with insects. Hylastes nigrinus, Pissodes fasciatus, and Steremnuis carinatus are commonly associated with diseased hosts, carry inoculum of V. wageneri in...

Resource Type:

Dissertation

ScholarsArchive@OSU

Population dynamics of the Douglas-fir cone moth, Barbara colfaciana (Kft.) (Lepidoptera:Olethreutidae)

Insects associated with black stain root disease of Douglas-fir in western Oregon

The root insect-- black-stain root disease association in Douglas-fir : vector relationships and implications for forest management

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